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Speed Triple Forum Rants and ravings about the best naked triple on the planet!

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Old 11-07-2012, 02:14 AM   #1 (permalink)
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Help/Input Needed - 2002 Speed Triple 955i Stumle/Hesitation Below 3k RPM...

Alright.. I've done some searching on this forum and on Triumph Rat for a resolution to my issue... and while I've got some helpful tips, nothing has fixed the issue yet. I've got a 2002 Triumph Speed Triple 955i that is completely stock with the exception of a K&N air filter that I picked up for free, but it came with issues. The issue is, when applying anything more than 1/4-1/3 throttle below 3k rpm's I get a hard stumble/ hesitation until it gets above 3k rpm's... this can be from a take off or while cruising down the road. It will also die if you do one or two low rpm rev's in neutral or with the clutch in. Engine temp is not a factor, so I've ruled out tight valves. I've replaced the coils and fuel pump with known good, used units, installed new spark plugs and a new air filter, done the 12 minute tune, reset the TPS through TuneECU and verified the fuel tank was venting properly. I have a completely disassembled 2003 Speed Triple that I am parting out, which I've been stealing parts from, but I'm not sure where to go from here.... any suggestions would be greatly appreciated.
Thanks,
Daniel
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Old 11-07-2012, 07:51 AM   #2 (permalink)
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Vacuum leak??
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Old 11-07-2012, 02:58 PM   #3 (permalink)
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^^ I think that's the most likely thing to look for as well.

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Old 11-07-2012, 08:57 PM   #4 (permalink)
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That's what it's looking like. Thanks for the help, I'll report back.
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Old 11-12-2012, 01:52 AM   #5 (permalink)
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No dice on the vacuum leak. I swapped out the throttle bodies, injectors and removed the SAI & canister while I was in there making sure everything was sealed. I also updated the map and disabled the SAI.
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Old 11-12-2012, 06:27 AM   #6 (permalink)
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I have heard new hoses can transform a bike that old.

Last edited by hac; 11-13-2012 at 06:10 AM.
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Old 11-12-2012, 01:19 PM   #7 (permalink)
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Which hoses?
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Old 11-13-2012, 03:11 AM   #8 (permalink)
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fuel restriction? The guy I got the triple from found rust in the tank of the virago I traded for him. I had been thinking it was a carb/float issue, because it would hesitate before hitting a certain throttle position, similar to you. So in a sense it would be fuel either way.

But then again, considering these bikes are basically cars with two wheels, I'd figure it could be the TPS.
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Old 11-13-2012, 06:06 AM   #9 (permalink)
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Quote:
Originally Posted by inderocker View Post
Which hoses?
The icv vac hoses I think there are 3 of them someone on here will know more Im sure.
http://www.triumphtorque.com/message...ight=vac+hoses

Last edited by hac; 11-13-2012 at 06:10 AM.
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Old 11-18-2012, 01:57 AM   #10 (permalink)
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Swapped out the IACV hoses, no change. I then checked compression and got some unusually high numbers on 2 of the cylinders.. left to right 160/200/195. I'm also getting a lot of backfire through the throttle bodies whether under a load when riding or when revving it... but always under 3K RPM. It seems more like a lean condition or timing issue. is the ignition timing adjustable on these at all?

Last edited by inderocker; 11-18-2012 at 02:04 AM.
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