| Author | Message | ||
     Eboos |
I am starting to get really aggrovated with my bike. I have been having trouble with it since I got it early last summer. It spent 3 weeks in the shop just to get it back in the same condition that I left it. I would rather not take it back to another shop. It seems like a stuck fuel tank vent valve/hose, but I checked them, and they are flowing just fine. My bike idles fine, and the throttle response is fine when the bike is not in gear, but as soon as I go to take off, the bike hesitates badly and stalls. I bypassed the side stand safety switch, and that didn't help. Bypassing the clutch lever switch doesn't do anything either. I tried popping the gas tank open, but no help. Any ideas? I am desperate. Thank you. | ||
| Ezblast |
Intake leak? | ||
| Jackbequick |
That is the point where the CV carbs transition from the low speed jet. You may have something sticking there or maybe a vacuum leak? Nightrider has a pretty good trouble shooting page for the Keihin CV carbs. Jack | ||
| Eboos |
How about a Mikuni? | ||
| Djkaplan |
I'm wondering if the rubber CV diaphram has a leak or hole in it. | ||
| Ezblast |
Vacuum/intake leak | ||
| Eboos |
Ezblast, I am going to check it out. I have the new seals already, but should I just go and replace them, or will the WD-40 test be the way to go. With my bike acting this way, would finding the leak be easy? | ||
| Ezblast |
I studied this to figure out my own problems as well long ago and every time the topic came up I watched Blake repeat this mantra forever, yes the WD test should work. Me - if I had the seals - I'd replace the old ones for peace of mind, however, jackbequick is right that nightrider does have a great carb troubleshooting section - always worth a read. GT - JBOTDS! EZ  | ||
| Hans |
Eboos, Installing new plugs is maybe not the first thing you will think off, but it is so cheap and easy: Certainly worth a try. And bad plugs can be the cause. Hans | ||
| Ezblast |
Doh! Never mind - I just reread your post, when you engage the engine this happens, however, out of gear you can rev to the moon - another thought - could your primary be adjusted too tight? Note: Spidey could be right as well - i just looked over my notes - either a clogged jet, intake leak, or too tight primary - are the usual - odd ball reasons I've read of involve a bad battery or really badly mis-adjusted clutch cable - neither I think pertains here. GT - JBOTDS! EZ (Message edited by ezblast on July 21, 2006) | ||
| Spiderman |
You have a plugged main jet. Remove the carb and clean it well and you should be fine... | ||
| Eboos |
I just finished replacing the intake seals. While I had the carb off, I replaced the pilot (#25) and main (#165) jets. I didn't get a chance to fire it up because as soon as I finished hooking up the gas tank, it started pouring outside. I'll test it in the morning. By the way, replacing the seals was loads of fun. I love turning bolts in 1/12 turn incruments then having to go another 1/12 turn from another location. | ||
| Jackbequick |
Erik, Excuse me for missing that you had a Mikuni not a Keihin. The Mikuni 42 is sort of reknowned for it's improved low speed throttle response when it is working right but I know little about it. I think it does have a vacuum port on the carb though and does need to be connected to the VOS switch that lives under the tank. And the vacuum port probably implies the potential for a leaky diaphram or something like that. Good luck with that! Jack | ||
| Eboos |
Well, the bike failed the test ride. I replaced the plugs before I went out too. I just went around the block a few times, and it was doing the same thing. I will check the VOES next. My intake has been ingesting a fair amount of oil. I had over filled the tank after checking it cold, and the oil seemed to overflow through the Devonator II breather and into the intake. The front plug had a little bit of oil on it, but the rear plug was fine. I decreased the oil level last week (thanks for the tip DucXL), that should prevent more oil from feeding through the intake. Would I need to shoot some Gumout through the carb to clean out any leftover oil, or will it burn away naturally? | ||
| Eboos |
I seriously can not figure this out. I didn't get to check the VOES yet, but I loosened up the primary, and that didn't help. Edit: Just checked the VOES, clicks at 5-6 inHg with 0 ohms. Also checked the hose that connects the VOES, hose is good. (Message edited by eboos on July 22, 2006) | ||
| Hans |
I know nothing about Mikuni`s But apart from that: To bite the bullet and clean the carb thoroughly, seems me the first thing to do now. Hans (Message edited by hans on July 22, 2006) | ||
| Ezblast |
concur | ||
| Eboos |
This may sound dumb, but do you have a suggestion on how to clean the carb? | ||
| Ezblast |
Take it apart and put it back together off the bike inspecting everything, at this time a rebuild kit may be in order, don't know a part number - bet someone does - at least in the KV - good place to ask or search. GT - JBOTDS! EZ | ||
| Hans |
To have a guideline: http://www.mxsquid.com/carb.html or http://www.snowmobilefanatics.com/articles/default.asp?cid=2&aid=13 or http://www.mxsquid.com/carb.html In short: Unhook all the cables and gas hose. Clean the outside well. Remove every copper thingie from the alu body that has an hexagonal head, or a slid in the head or a cross head. If that carbclean product helps to remove tarnish and gum, it is a wonderful product. I had to help myself with ammonia water and much rubbing. Fine copper strands of electrical wire will not damage small holes. Dental floss, fish line and ear cotton sticks can be of help and, of course, the old, but clean, handkerchief. If the task is done well, you can be sure that the carburettor is fine. Good luck, Hans | ||
| Hans |
At second thought: Did you check if you have a strong spark ? When you pull a plug and turn the engine the spark will bridge a gap between the plug body and the ground (engine) of about half an inch: At least 1/4 inch. (TAKE CARE for good personal insulation: About 50.000 Volts high tension on the plug wire.) Check the coils when you have a weak spark. Hans |
