Triumphrat

krispijnspa

I had previously asked about advice for a surging 2000 sprint rs with 13,000 miles. The bike has california emissions junk on it excluding an 02 sensor, and the bike has been down. The bike is at Cascade moto Classics right now, I dropped it off Thurs. and they called me yesterday(Fri.) and told me that the Mapping was ok and that the throttle bodies were ok. We talked about having the valves redone. (They don't have time and I drove four hours to get here and must go home tomorrow.) The bike runs strong and the surging is almost unoticable at speed, but intollerable at slow speeds up to 40ish. I have replaced the plugs with an iridium set, Cleaned and recharged the K&N filter, lubed the chain etc. the brake pads do need replacing, and are maybe dragging? So my questions are. does any one have experience disconnecting (bypassing) the california emissions, ie; charcoal canister, one way valves etc. also how do I check for leaks in the air box? If the valves have never been re-adjusted could they cause this, i was hoping to wait until spring to have them re-adjusted.

tiger230

Sorry, but the problems you are experiencing mostly come from the Sagem fuel injection system used in the early 955 bikes. It is possible to get it to work pretty well but the procedure has been worked out by Triumph over the years and isn't in the workshop manual.
I would suggest you get them to check the following:
The closed throttle TPS voltage (should be about 0.588 volts from memory).
Check the TPS itself by removing it and making sure it moves smoothly; the early units get full of crud and cause problems.
Make sure there is freeplay in the throttle cable.
Check the vacuum lines from the manifolds to the IACV (idle air control valve) for leaks; and if they have one way valves, that they work properly.
After checking all of that; get them to reset the 'adaptions'.
(I am assuming they have a mechanic that has done the Triumph EFI course, and have an ACTIA diagnostic tool

Victusvita

Also have this surging problem? What would be considered an early 955i??

CharlieS

earlier than 2001

The Kurgan

I experienced a bit of surging at idle, and some surging/hesitation under 3500 rpm on my 2005 Tiger. Cured with an 02 sensor bypass and the correct/latest "tune".

I also found that the Tiger runs smoother at idle with the stock can versus the TOR can. Common to many motorcycles.

Your problems may be something completely different, but I certainly wouldn't blame it on the Sagem fuel injection!

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mykidsdad

Had similar problem low speed surging and stumbling with my '98 T595. A real beast to ride in city traffic. Ran great on the road. Bought the Tuneboy software, loaded the right map for my aftermarket exhaust she been running like a champ for years. If you have an aftermarket exhaust you'll need a better map than the generic ones the Triumph dealer will have available to load. Good luck.

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ride4321

I also have that problem with my '00 ST. Mechanic suggested getting a Power Commander. I have a Two Bros. can on the bike and I know that's the culprit although the bike was a bit rough even with the stock pipe when I bought it last year, but much smoother than it is now. My question to you all is ... should I go with Tuneboy or Power Commander? My mechanic recommended Power Commander but that might be because he's more familiar with it. I can pick a unit up for about $265 whereas the Tuneboy will probably be closer to $400. Anyone have any insite as to the differences in the two products? I love my '00 and plan to ride it for 3-4 more years or 100K, whichever comes first.

DaveM

Ride I think you should read this:

http://www.tuneboy.com.au/Compare/Compare.html

DaveM

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ride4321

Thanks for the link Dave. I've seen that before and realize there is a big difference between the two. My mechanic suggested the power commander as I think he's more familiar with it. As a matter of fact, I was getting a tire put on last night talking to my local Honda mechanic and he also suggested the power commander. In his case he just has never used Tuneboy.
So your recommendation is for the Tuneboy I guess. I'll probably wait until the season is over to decide and in the meantime I'll read all the info on this site about Tuneboy. It sounds like I'd be able to dial it in myself with that unit.

MikeWilliams

They all do that. The air/fuel targets in the tune are set too lean at the lower rpm's.Tuneboy cleaned it up for me.