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Gearheaderiko
| | Posted on Thursday, May 03, 2012 - 01:03 am: | 
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Backfires are a symptom of the boot and it can also cause a boot to split. It can also be the result of just being too lean, bad timing or a faulty safety switch.
The knock could also be a too loose chain, but lets get the timing first. |
Gearheaderiko
| | Posted on Thursday, May 03, 2012 - 01:07 am: |
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Sometimes the only way to tell if the boot is bad is to take it off. The split is always where you cant see it! But if you take it off and it looks good, it probably is. The next problem is usually the clamps being too loose or too tight. |
Evanj11
| | Posted on Thursday, May 03, 2012 - 01:21 am: |
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To test for leaks on das boot, could I mist or spray water at it with the engine running?
I have tried adjusting the clamps too loose, and also as snug as seems right (and then a bit more), but it makes no difference.
How about a cooler plug, possibly the NGK DPR9EA-9? I saw that was recommended to someone else.
The only issue I have with the different plug is that it seems to be a patch, not directly addressing the problem. |
Gearheaderiko
| | Posted on Thursday, May 03, 2012 - 01:34 am: |
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WD40, carb and choke cleaner are better for testing. I'm not really seeing the boot as your problem at this point.
I do think you're a little low on your shift points. But I think you'd have to really be on the gas for it too knock. Like I said, you cant hurt the engine if you rev it all the way out (but if there's major knocking, thats a different story).
I dont think a different plug is in order either. Now if this was august, 95 degrees and you say after about an hours ride you're getting knock and ping, then maybe a cooler plug. But I'm hearing after a short ride you're getting knock?! What I'm getting is that this is a major issue, not a minor concern. |
Evanj11
| | Posted on Thursday, May 03, 2012 - 05:56 pm: |
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I tried, WD40 and water on the boot, neither one produced a change.
I get the knock any time I rev it. Video of engine knock:
http://youtu.be/Pjvhr5MKG0M
First section of the video is in first gear, second section stationary.
(Message edited by EvanJ11 on May 03, 2012) |
Ezblast
| | Posted on Thursday, May 03, 2012 - 09:29 pm: |
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Sounds more like a bad lifter.
EZ |
Evanj11
| | Posted on Thursday, May 03, 2012 - 10:21 pm: |
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I'm assuming it isn't smart to ride it with a bad lifter?
I will read through the service manual and try to get in there this weekend.
Any advice on what to inspect/look for, will it be obvious?
(Message edited by EvanJ11 on May 03, 2012) |
Gearheaderiko
| | Posted on Thursday, May 03, 2012 - 10:43 pm: |
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True about the lifter, but I really couldnt tell the difference just from a video clip. My valve train is that loud anyway!
You can ride with a bad lifter. It is sometimes (besides removal) the only way to get a hydrolic lifter to pump back up. If it is actually making noise, it isnt making much (from what I heard). They'll collapse just from sitting for long periods (like your Blast did).
Your other choice is to replace it and thats a bunch of work. |
Gearheaderiko
| | Posted on Thursday, May 03, 2012 - 10:45 pm: |
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PS I dont hear it knock like a collapsed lifter and at that point they dont really run very well.
But if your mechanic friend listens to it he should be able to tell (maybe?) |
Evanj11
| | Posted on Thursday, May 03, 2012 - 11:32 pm: |
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Sweet, I'll hop back on it 
Really sucked getting in the car everyday as soon as it started to get nice around here. |
Bluv21
| | Posted on Friday, May 04, 2012 - 09:35 am: |
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Doesn't a knock/ping sound like a bag of wrenches being tossed around in your cylinder when you engine is under load? |
Gearheaderiko
| | Posted on Friday, May 04, 2012 - 11:25 pm: |
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Yes. But he's complaining about an actual "knock" from engine parts banging together.
Evan: The lifters are the same as in a car. Usually they start to make noise when they are going bad or when the engine wasnt run for a very long time. They rarely just completely collapse. If it does, it will make a lot more noise and run very poorly. If that happens, definitely stop riding it.
It would be nice for someone to actually listen to it "live" since EZ hears a bad lifter and I just hear normal valve train clatter. Per the above it should sound just like a bad lifter in a car. |
Evanj11
| | Posted on Monday, May 07, 2012 - 07:30 pm: |
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It appears to be performing the same as the day I got it(other than the noise), but it is hard to recall a good base line - many minor problems so far... and hidden gems of damaged and bent parts 
Oh well, I've learned my lesson for a second time now = don't buy a used vehicle that sat around with nearly zero miles on it. Had problems with a car that sat for years. "Basically New" no longer applies after five years.
My motorcycle mechanic I have lined up still hasn't had a chance to check it out.
"Your other choice is to replace it and thats a bunch of work." - Erik
Like removing/dropping the engine?! That is what it looks like after reviewing the troubleshooting and inspections procedures in the service manual 
Erik - you also mentioned that the hydraulic lifter would collapse after sitting for a while, however the bike ran for a few hundred miles before the noise began. There was an extremely faint clicking noise since day one, not sure if that is related or another issue needing to be resolved. |
Gearheaderiko
| | Posted on Thursday, May 10, 2012 - 12:05 am: |
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You don't have to pull the engine, you just undo the front mount and lower it. But you will have to pull the head, that's where all the work is.
The lifter collapsing was just one scenario for when an engine sits idle, not necessarily yours. The lifter failing after being okay is unusual. Possible yes, but not common. One possibility is low oil pressure. That will let the lifters "bleed down" . |
Evanj11
| | Posted on Thursday, May 10, 2012 - 12:15 am: |
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I was able to get someone to look at it today. They didn't seem too concerned with the noise. He did comment that I may have switched to synthetic oil too soon? Never heard of this.
I got my new boots too, going to replace the old one to see if it makes any difference with the occasional backfires. |
Gearheaderiko
| | Posted on Thursday, May 10, 2012 - 09:24 pm: |
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If you havent changed the slow jet to a #45 do it while you do the boot. Installing the #45 might cure your backfiring too as they are very lean from the factory.
Synthetic oils are said to hamper regular engine break-in, but these days it depends who you talk too. |
Evanj11
| | Posted on Friday, May 25, 2012 - 11:00 pm: |
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Das boot failed. Bike wouldn't idle at first, then it wouldn't run at all. Pulled the boot off and it was split in three places. |
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