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Discussion Starter #1 (Edited)
Just got my Vee back from having valves checked/shimmed. Bike seemed to run ok then, at the end of a 60-70 mile ride - a block from home at a stop sign, seems like something came loose - started sputtering, knocking..no power - backfiring. Limped it a block, shut it down & coasted into the drive...not good. My first thought is something was not done correctly or put back together correctly. Could be something else ie. coincidence but I have a hard time believing it is coincidental. Now I am unsure if I take it back to the wrench who did the work or go elsewhere. Thoughts? More info - 05 Vee 1K with 14,400 mi. only Also had them do a TBS
 

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I'd take it back to the people who did the work. Definitely. Mistakes happen, even with the best techs.
 

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The mechanic you're using, is he a shadetree, or a business? Is he insured? These are serious questions. If he's a shadetree, then you'd be best taking your bike to a real mechanic, and then giving the shadetree a piece of your mind. If it's a business that did the work, then go after them 100%. Tell them what happened, and let them figure it out. If it turns out to be something completely unrelated, then just have them fix it, and be happy.

Lucas
 

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something came loose - started sputtering, knocking..no power - backfiring.
Look to see if one of the air box rubber outlet tubes came loose from a throttle body.
 

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I doubt shade tree mechanics have the OEM TSB information. Your question sounds to be one that was regurgitated before carefully reading the OP's words.

OP, call the shop and take the bike back. Good luck.

The mechanic you're using, is he a shadetree, or a business? Is he insured? These are serious questions. If he's a shadetree, then you'd be best taking your bike to a real mechanic, and then giving the shadetree a piece of your mind. If it's a business that did the work, then go after them 100%. Tell them what happened, and let them figure it out. If it turns out to be something completely unrelated, then just have them fix it, and be happy.

Lucas
 

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I doubt shade tree mechanics have the OEM TSB information. Your question sounds to be one that was regurgitated before carefully reading the OP's words.

OP, call the shop and take the bike back. Good luck.
Weeeeeeeeeeeeeeeeeeeeeeee, you're the pot calling the kettle black.:thumbup::thumbup::thumbup::thumbup:

Go back and read again. He said he had them do a TBS. Not a TSB. Now go read carefully before regurgitating.:mrgreen::mrgreen::mrgreen:

Lucas
 

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Discussion Starter #8
It's a shop - Not a Dealer but a shop that's been around for a while. I can only hope the issue relates to the throttle bodies and not the valve train / engine internals.
 

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It's a shop - Not a Dealer but a shop that's been around for a while. I can only hope the issue relates to the throttle bodies and not the valve train / engine internals.
If it's a real shop, they should make it right. I would call them right away, and tell them what happened. Tell them that you expect them to make it right.

Lucas
 

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I had a virtually identical situation with a well-known sportbike shop here in South Florida. I took the bike in for the same work, and took it out on a trailer. Although they are competent with many bikes, the Suzuki throttle bodies were completely beyond them.

I took it to the local dealer, and they had it running perfectly in under 2 hours. The mechanic said they had the TBs completely out of sync, and the Throttle Position Sensors were not properly calibrated.

The tip on the loose intake hose is a good one, but if it's not that, it's bound to be the TBS / TPS.
 

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Discussion Starter #11
Another question then: If it were the TPS, would/should it run better or good once cooled off? I had a problem with the TPS once earlier this year, after a long run 2 up, idling went to he$$ but bike would still run normal at speed. And once I hit cool air (rode into Duluth, MN - it was 45 degrees) all was good.
 

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TPS problems do seem to be heat sensitive at least some of the time. Another thing to try is to turn the throttle stop to stop a few times with the ignition on but the engine off. That can get things straightened out for a while if the TPS is a problem
 

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Look to see if one of the air box rubber outlet tubes came loose from a throttle body.
Yes, that is a good place to start.

You may also want to check the spark plugs. Did one of them blow out of a cylinder?

DEFINITELY take the bike back to your mechanic!
 

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Discussion Starter #14
Good call Black Lab Just talked with the shop - bike is fixed. In the valve check / shim process (they also cleaned the K&N air filter I just put in 3K ago) it appears the rear cylinder plug received a little too much oil & fowled - backfire blew the throttle body boot off. They originally re-installed the boot, ran the bike - ran fine, let it sit awhile, re-started it and blew the boot off again and then determined the plug was fouling - replaced plugs and all is good (for now - fingers crossed)
 

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it appears the rear cylinder plug received a little too much oil & fouled
???? Too much oil on the K&N air filter can cause problems, but otherwise, how did the plug get any oil? Oiled plug threads? I haven't had a fouled plug cause a backfire, they just don't fire, but whatever.... I'd find a new shop. They screwed up, or maybe they screwed up and lied to you.
 

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Discussion Starter #16
Possibly - But they did not charge me, as they should not have, and as such, I do not think they are giving me a line of BS Why would they. If they wanted too, they could have given me a line of BS and charged me saying it was something else - some other 'coincidental' problem. So, I do trust them in terms of honesty and standing behind their work and that, to me, is worth a lot.
 

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???? Too much oil on the K&N air filter can cause problems, but otherwise, how did the plug get any oil? Oiled plug threads? I haven't had a fouled plug cause a backfire, they just don't fire, but whatever.... I'd find a new shop. They screwed up, or maybe they screwed up and lied to you.
I'm with PTRider on this. How does cleaning the K&N = backfire? Those seem unrelated. However, if they changed the plugs and it's running fine, then who cares. Just be happy your motor didn't get grenaded.

Hopefully it won't return. Just remember, you said the first time you picked her up, she ran fine for 60-70 miles, then took a dump. Badly adjusted valves can cause backfiring.

Lucas
 

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If it happens again, suspect the cam gear may be a tooth off in alignment. If the mixture fires before the intake valve fully closes, it can blow the boot off.
 

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Discussion Starter #19
Ran good this AM on the commute, but now I'm getting paranoid. Based on as Greywolf & PT's views, which to me, seem to be more logical... time will tell. I may have to 'test my wrist' when I get close to home - see if a little spirited high revving will affect things.
 
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