G oog le BadWeB | Login/out | Topics | Search | Custodians | Register | Edit Profile


Buell Forum » THUMPer Forum » Buell Blast Thumper Knowledge Vault » Diagnosing problems: « Previous Next »

Diagnosing Problems / Causes / Intake Boot (Das Boot!)

This is a summation of several posts on BadWeb (thanks to all)

The Blast has a vacuum operated carburetor. The intake boot transfers vacuum created from the stroke of the cylinder. The Blasts carburetor is basically suspended by the intake boot and the air filter compartment. It is subjected to a large amount of vibration, and as it gets older, it starts to crack, allowing the vacuum to escape robbing your carburetor of the proper air & fuel mixture necessary to run your bike well


Intake Boot Symptoms (Smallest to Largest) :

*) Flat Power Loss - If you are experiencing loss of power while riding flat, not under load, not going up a hill or a steep grade
*) Small increases in fuel efficiency - Do you normally get 65 to 70 miles per gallon, and now it seems your getting 70 to 75
*) Do you have random power loss followed by backfire, then a regain in power
*) Bike will not start, will turn over, but will not start
*) Will idle but dies when you apply throttle.


Tests
*) Make sure it is not a gas tank vacuum issue, try to start your bike with the gas cap off (If no continue)
*) Have you checked your fuel is on, the fuel filter &main line into your carburetor? (If yes continue)
*) Are you getting consistent spark from your plug? (If yes continue)
*) Place your hand over your carburetor while attempting to start the engine. You should feel strong suction on your hand, (If not continue)
*) Replace intake boot


Replacement at a garage will run you just under $170, 2 hours labor + part, the part is about $10.00 retail and very easy to replace. Following the Service Manual instructions for checking fuel filter and removing carburetor will get you all the disassembly and reassembly instructions. Be sure you have the boot seated in the grooves correctly, and that the clamps are in the correct grooves and tighten sufficiently.

NOTE: I noticed the smaller issues for about a month before my boot issue got to the point my bike would not start. It has also been suggested that you regularly change the intake boot at least every 2 years.


For resolving the issue:
Yes - but also check your front and rear grounds and battery connections. doing the boot is simple:
To replace the "Boot" (Manifold-Carb Coupler),you need to loosen both sides of
the airbox first....then you can pull the airbox with the carb attached - a
little bit away -so THEN you can pop out the Boot ! Ok- on the left side of the
airbox lower down- you locate and remove the TWO bolts that hold the airbox to
the triangular bracket that bolts to the block- But DO NOT remove that Third
Bolt that holds the bracket to the engine block- that one remains intact ! Then
on the right side of the airbox, remove the one bolt that goes thru that small
metal tab on the underside of the airbox- that attaches it to the engine block..
after that- the box and carb are free to move enough to safely pop off the
intake boot (manifold connector) and replace with a NEW one. Now time to button
it back up. When you're done snugging up the boot clamps(don't overtighten and
shread the rubber!) you Then use "Blue" loctite on the CLEANED threads on the
lower right side bolt and tighten snugly (the Torque is 10-12 ft lbs)-don't
strip the aluminum threads in the block. On the left side, the bolts insert
into a brass(threaded) insert into the airbox, just use ONE drop of (low
strength)"Purple" loctite on THOSE cleaned threads, and snug them up(Torque is
3-5 ft lbs)- but don't strip by over tightening. And thats all there IS to it!
EZ

Bank Angle Sensor (BAS) safety switch bypass:

The BAS has 3 wires going to it. The white wire with a black stripe is "hot" or positive. Double check it to be sure you have the correct wire. It is the only one that is "hot". Do nothing with this wire.

The other two wires should be connected together.

You must check the Bank Angle Sensor (BAS) safety switch too. It's a common culprit of intermittent problems. When working properly, the 3 wires will show 1 hot (white w/black stripe) and 2 ground. If one wire does not show ground the switch has been tripped and will not (or should not!) reset until the ignition is turned off. If after the ignition is turned back on the 2 wires should show ground. If not, it's bad.
For anyone wanting to get rid of their BAS switch. Cut it off and connect the green/yellow wire with the tan/yellow wire and cap off the third wire.
You can plug it back into the BAS or leave the BAS plug hanging. And......If the BAS is bad, the LED on the module will still flash.

For kick stand bypass - twist wires together.

Clutch Diode - middle diode - Flip - link:
http://www.badweatherbikers.com/buell/messages/20164/55319.html

Start New Thread
  Thread Last Poster Posts Pages Last Post
Transmission Drain Plug DripGearheaderiko09-28-19  11:30 pm
Bad Gas Mileage?Gearheaderiko06-05-19  03:53 pm
Blast only runs perfect with float bowl vent blockedGearheaderiko15 04-18-18  12:11 pm
Having trouble with back brakesGearheaderiko19 10-16-17  03:13 am
Heavy Shaking at Low SpeedGearheaderiko20 10-01-17  08:26 pm
07 Blast won't startGearheaderiko08-08-17  11:53 pm
2009 Buell Blast Wants to Stall Out at Red LightsWrightd22310 10-04-17  09:25 am
2 belts broke in a monthGearheaderiko06-16-17  11:33 am
Mid range rpm power loss/hesitatingInvader_zim14 03-19-17  12:28 am
Bike will only start with starter fluidModrummer43 10-30-16  09:54 am
Trans/shifter issue Anthony026730 11-15-16  06:29 am
Trans/shifter issue Anthony026710-14-16  05:56 pm
09 Blast warms up then revs out of control. Dangerous Missionbolts29 12-05-18  11:33 am
Occasional White SmokeWrightd22356 10-06-16  06:15 pm
Ajusted clutch to manual exact spec now bike doesnt wont to take offAnthony026715 06-22-16  11:22 am
Das boot is melting please help Gearheaderiko06-13-16  10:17 pm
New rider, new projectBhdooo183 02-18-17  03:52 pm
Belt "Chirp"Gearheaderiko06-16-16  10:59 am
Snapped Drive BeltGearheaderiko01-26-16  09:27 am
Searching for reliable Blast Ignition moduleSpeedcityles10-10-15  11:23 pm
Problems starting/running blastGearheaderiko08-30-15  04:33 pm
Bike won't idleEzblast06-14-15  12:27 am
Bike Starts, then diesEzblast05-01-15  03:24 am
The longer I ride the higher it idles... Gearheaderiko15 04-15-15  05:10 pm
2000 Blast issues (ignition?)Gearheaderiko03-26-15  04:15 am
New Blast OwnerGearheaderiko16 03-22-15  07:28 pm
Excitement fading with every backfireGearheaderiko11-19-14  06:28 pm
Clutch problems?Gearheaderiko19 11-14-14  02:58 pm
New Loss of Power and BackfireDaemon51210-18-14  12:10 pm
Vent line broke, issues since...Gearheaderiko08-08-14  08:06 pm
Thomas's 2000Ezblast07-08-14  12:39 am
30 mpg?Ezblast14 07-07-14  04:24 am
Restarting troubleGearheaderiko07-28-14  04:22 pm
Blast won't start without starting fluidJetlee10 04-28-14  10:42 am
Blast starts then dies with throttle Jetlee36 05-15-14  12:10 pm
Five Blasts with the same problem?Bumblebee01-12-15  04:00 pm
Dropped bike, Wont StartStevenchase12 01-30-14  04:15 pm
Turnsignal flasher problems grond or hot to switchEzblast10 11-30-13  11:20 pm
Power Loss and ONLY 30MPG 0-0 Gearheaderiko11-17-13  10:10 am
Ok. Bike wins. Little helpGearheaderiko11 11-16-13  05:56 pm
Brand New Blast Loses Power When Throttle Is AppliedStevenchase10-08-13  05:23 am
Same old story, stored Blast now won't start.Gearheaderiko10 09-15-13  01:52 pm
Throttle not recoilingSwampy15 09-09-13  04:30 pm
Smokin'Gearheaderiko07-31-13  05:24 am
2002 Blast won't startGearheaderiko10 09-25-16  06:24 pm
My Bumblebee needs help, 2001 Blast starvingGearheaderiko07-28-13  12:21 am
Ride for a while, shut it off, wont restartGearheaderiko14 08-14-13  07:02 pm
Top speed around 65mph: primary adjustment issue.Gearheaderiko17 03-08-16  07:07 am
Oil leak, left bottom Gearheaderiko17 06-23-13  10:19 pm
Intake issuesGearheaderiko15 06-24-13  09:02 am
Blast Backfires Past 1/2 throttleSwampy04-29-13  01:38 am
Oil Filter Leak?Swampy04-17-13  09:34 pm
Downshift IssueValhalha3029 04-22-13  09:36 am
Cant get over 20 mphSwampy03-22-13  10:58 pm
Idling HighGearheaderiko13 07-06-16  09:50 pm
Newb problem; vacuum leak/running lean?Asharp2712 03-16-13  11:09 am
New V&H Exhaust White Smoke & Nasty Smell? Ezblast12-30-12  02:54 am
2003 Blast - Adjusted Clutch cable..now wont engage gearsBuellistic12-15-12  09:23 pm
Cant get it startedEzblast12-08-12  11:24 pm
Engine cuts out while driving - some backfirePatent11-17-12  02:30 am
Sputtering and loss of top end speedEzblast10-23-12  09:31 pm
Problems removing ExhaustDantes_buell10 10-06-12  11:47 am
To be, or not to be.. That is DAS question!Cleve_thumper10-01-12  10:45 pm
Can't gain full throttleEzblast09-28-12  11:53 pm
Thumping feeling when coming to a stop when 2-upBlackblue09-06-12  12:44 pm
Clanking in primary caseEzblast09-28-12  11:55 pm
Put new Superbike Handlebars...loose fitting components now?!Milt08-09-12  08:31 am
Grinding into first and secondGearheaderiko07-20-12  04:58 pm
Knocking under strainEzblast16 07-26-12  05:29 pm
Transmission issuesEzblast14 06-23-14  01:56 pm
'02 Blast backfire + power loss with incline Ezblast13 07-01-12  04:04 pm
Issues starting my Buell Stephanem06-21-12  03:50 pm
Wobble.....Spade11506-07-12  09:19 am
Died while driving, will not turn overGearheaderiko20 06-09-12  08:55 pm
What are these?Livefreerunhard05-31-12  01:52 am
Another Blasting Headache!Gearheaderiko05-24-12  01:22 pm
HandlebarsEzblast05-21-12  01:29 am
Busted Exhaust(?)Ronbob4322 06-06-12  02:42 pm
Carb Backfiring?Gearheaderiko10 05-16-12  03:20 pm
Success storyGearheaderiko28 05-16-12  03:07 pm
515 wont startStyxnpicks49 04-20-17  01:19 pm
Primary chain limiter aint limitinGearheaderiko19 03-09-14  09:57 am
2001 Blast giving me problems I can't diagnoseGearheaderiko30 03-29-13  12:01 am
2004 P3 Runs Very Rich, Fouls out PlugsEzblast05-03-12  04:28 pm
Not sure if it's a problem but...Bluv2104-26-12  11:59 pm
Missing at 60 then slows downGearheaderiko05-13-12  02:54 am
Bike wont startTexassdmf04-21-12  01:28 pm
Starts ok, then quits.Dantes_buell24 10-05-12  04:28 pm
Transmission chatteringGearheaderiko04-24-12  06:40 pm
Flat spots around 20-30 MphBluv2104-03-12  10:40 am
Problems with clutchAllen7736004-06-12  02:31 pm
Clicking noise when idling Bluv2103-31-12  01:25 am
Fires, but not runningGearheaderiko03-21-12  09:36 am
Loose piece of Metal??Johneblast17 02-27-12  09:06 pm
2000 Blast Problem...she no start...Gearheaderiko02-09-12  09:05 pm
Clunking noise when starting out from stopSamcousa01-25-12  10:09 am
Help, new young oneMilt11-08-11  02:54 pm
Oil LeakLilblueblaster15 09-30-11  10:06 am
Starting Running problemsEzblast29 10-26-11  04:32 pm
Low horsepower, engine cutting outSpade11509-19-11  03:47 pm
Blast diesGearheaderiko03-22-15  02:30 pm
00 Blast Backfiring at High RPMsGearheaderiko08-09-11  05:30 pm
Extremely low top speed (60mph) Please helpZroknwn110 09-10-17  11:39 pm
Help , new guyPoppa26 07-24-11  07:41 pm
Power loss in top gears.Ezblast06-30-11  07:56 pm
2001 Buell Blast - Hard to cold start; idles highGearheaderiko21 06-21-11  09:37 am
Push rod leaking oil... : (...Duketa06-13-11  03:08 am
2002 buell blast dies when you turn the barsRicksbuell05-30-11  05:33 pm
2007 Blast Starting IssuesGearheaderiko20 05-24-11  09:52 pm
Cold start issues?Ezblast18 06-03-11  03:53 pm
Please help! Blast's backfiring and I'm frustratedBrian112117 02-05-13  08:44 pm
Oil leak/clickingAdrianlives70231 12-23-11  04:15 am
Solutions Beyond "Das Boot"Ezblast68 07-19-11  06:47 pm
2000 Buell Blast Stalls When IdlingEzblast45 07-15-13  08:56 pm
Continuous throttle!Imblasted12 06-22-11  11:06 am
Blast wont startEzblast54 07-09-11  09:52 pm
Rocker gasketGearheaderiko12-23-11  09:29 pm
Not starting like it shouldSwampy07-14-11  09:45 pm
Runs Great , and then it doesnt...Gearheaderiko13 06-17-12  12:32 am
2000 Blast choke issuesBluv2124 05-29-12  03:25 pm
2003 Blast 10K milesGatiredealer17 05-31-12  02:00 pm
Blast would not run. Syonyk04-30-12  06:59 pm
Archive through May 20, 2011Gearheaderiko1117 91 11-14-15  08:56 am
Archive through July 21, 2013Gearheaderiko30 07-21-13  04:23 pm
Archive through October 23, 2011Gearheaderiko30 10-23-11  03:46 pm
Archive through July 01, 2010Gearheaderiko30 07-01-10  10:31 pm
Archive through March 08, 2010Crackhead30 03-08-10  08:08 pm
Archive through July 01, 2009Ezblast30 07-01-09  05:26 pm
Archive through December 24, 2008Gearheaderiko865 50 12-24-08  06:39 pm
Archive through November 21, 2008Roysbuell30 11-21-08  05:48 pm
Archive through July 26, 2008Gearheaderiko30 07-26-08  02:13 am
Archive through July 19, 2008Swampy30 07-19-08  01:08 pm
Archive through June 02, 2008Wolffsoul30 06-02-08  04:37 pm
Archive through May 26, 2008Gearheaderiko30 05-26-08  09:01 pm
Archive through May 02, 2008Gearheaderiko30 05-02-08  01:35 am
Archive through April 01, 2008Gearheaderiko31 04-01-08  10:04 pm
Archive through October 09, 2007Goodfoot30 10-09-07  12:55 am
Archive through September 25, 2007Ezblast30 09-25-07  01:06 am
Archive through July 05, 2007Sking197330 07-05-07  12:42 am
Archive through June 07, 2007Marineblast30 06-07-07  12:05 pm
Archive through May 18, 2007Swampy30 05-18-07  08:20 am
Archive through September 30, 2006Swampy30 09-30-06  11:08 pm
Archive through August 18, 2006Blake30 08-18-06  01:21 pm
Archive through July 26, 2006Gearheaderiko30 07-26-06  05:33 pm
Archive through May 31, 2006Swampy30 05-31-06  11:03 pm
Archive through April 16, 2006Sking197330 04-16-06  01:15 pm
  Start New Thread        

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Luvdathump
Posted on Tuesday, July 23, 2013 - 01:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The blast ran great till about 3 weeks ago. Use needle has been shimed, air mixture screw has been drilled out and adjusted. The carbs been rejetted to you and Ez's recommendations. The carb work has been done for over 3 years. The intake was done at the same time. I'm still having problems uploading a pic, I got the image size right but the file size is too big. I will another approach tonight after work.
Top of pagePrevious messageNext messageBottom of page Link to this message

Ezblast
Posted on Wednesday, July 24, 2013 - 08:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Bad gas?
EZ
Top of pagePrevious messageNext messageBottom of page Link to this message

Gearheaderiko
Posted on Monday, July 29, 2013 - 02:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Concur.

You can check the diaphragm. Also check the vacuum plug on the carb-if it has one-the cap can crack.

I assume you mean low rpms? Clogged slow jet is a good assumption, but I think it would have hard starting and poor idle too.

Bad ignition parts will cause you hair loss. Usually its high rpms, but low speed lugging will cause them to act up. Its far often the module going bad than the coil. The module can also act erratically in symptoms.

Loose plug wire or spark plug nipple is a possibility.

Bad plug wire.

Since you havent done anything recently, I'm going to assume this is a completely new problem unrelated to anything that might have recently been done.
Top of pagePrevious messageNext messageBottom of page Link to this message

Andrewg
Posted on Saturday, November 21, 2015 - 02:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So I am new to the whole motorcycle thing. I recently picked up a Blast as my first bike and it has problems that I've been tinkering with. Anyway it is missing the bolt for the air box that goes into the engine I think? Is this a big deal to be missing? This bike is actually missing a ton of the hardware.
Top of pagePrevious messageNext messageBottom of page Link to this message

Gearheaderiko
Posted on Saturday, November 21, 2015 - 03:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

No, not a big deal, but it should be replaced. A ton of hardware sounds bad :-(

DO NOT TAKE THE CARB APART "to give it a good cleaning"! Please!

....and Welcome: )
Top of pagePrevious messageNext messageBottom of page Link to this message

Jetlee
Posted on Sunday, June 12, 2016 - 10:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Wait, what bolt?

There's 4 holes from the airbox to the carb, but only 3 require a bolt. The 4th (top left) is a vent for the bowl.
Top of pagePrevious messageNext messageBottom of page Link to this message

Jetlee
Posted on Tuesday, June 14, 2016 - 12:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Erik, did you post that in the wrong sub-forum? lol
Top of pagePrevious messageNext messageBottom of page Link to this message

Gearheaderiko
Posted on Tuesday, June 14, 2016 - 12:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

How in the heck did that happen?

Crap, I'm REALLY old!!
« Previous Next »

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Password:
E-mail:
Options: Post as "Anonymous" (Valid reason required. Abusers will be exposed. If unsure, ask.)
Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Tree View | Search | User List | Help/Instructions | Rules | Program Credits Administration