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Triumph Tiger firing on two at tickover but seems ok at spee


Guest TigerJon
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Weird weird weird.


My 1994 Triumph Tiger sounds like it is only running on two cylinders at tick over, but when riding it seems not to be down on power at higher revs.


Now I am either kidding myself, and my triple has turned into a twin - or third cylinder is kicking in at higher revs?


right hand downpipe does not even get warm at tickover whilst other two get hot quickly. (did water spray test)


I took off the HT lead while it was ticking over and sure enough - no discernable difference


I put a spare plug onto the removed HT lead and spark is very strong...


Sooooo then - clues?


Could this be a carb problem?


Any ideas what I can do next?

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My first guess would be throttle bodies need a balance, should be fairly cheep to get done at any garage.


If you want to do it yourself you will need a set of vacum gauges and a manual.

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If throttle bodies need a balance, wouldnt she be running lumpy throughout the rev range?


I was thinking that it might be the pilot jet blocked on the one carb (with a bit of crud or something) but I dont really want to strip the carb down if someone on here tells me its not likely to be it?

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If throttle bodies need a balance, wouldnt she be running lumpy throughout the rev range?


I was thinking that it might be the pilot jet blocked on the one carb (with a bit of crud or something) but I dont really want to strip the carb down if someone on here tells me its not likely to be it?

 

Not always, as you open the throttle the carbs open up using the main jet and so the balance will be less of an issue, but at tickover it may be enough to stop one cyl fireing.


I would change the plug as rennie says, get the carbs balanced and set up and balanced and see how you go. May be worth having a go with some Wynns carb cleaner first (take air box off run bike and spray it down the carbs).

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plugs are brand new and was the first thing I changed - have put nitrox hot shot into the fuel supply and run it - no change. Might be worth a squirt of wynns before I strip the carb down, but if the pilot jet is totally blocked, my guess is that the wynns wont work its way in far enough to do the job...


At least with the wynns, I should be able to assess if the cylinder starts firing with a squirt in it which will definately point to a blockage somewhere


I will have a go and report back though.

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