Yamaha TRX850 Enthusiasts Forum

I have been doing a bit more freeway work in the last couple of weeks. i have noticed that at about 55mph in top gear the bike seems to be surging?? at first thought it was wind and my body working like a sail. but have been playing around, if i change back to forth and continue it disapairs.

the revs dont change it just feels like it loses power for a second or two at a time. it was there befor i did all the rebuild.
I know it needs a session on the dyno but has any one got any clues on what to look for befor i speend heaps on getting the shop to do stuff i can.

sounds like it's running a bit lean. could be a carb diaphragm split or not seated correctly. airbox stubs not on the carbs tightly. carb to head rubbers twisted or split. needle too low.????

55mph in top gear, it must be so lumpy at those speeds it might just you opening the throttle a touch, or closing it.

Speed up

gregs656 wrote:55mph in top gear, it must be so lumpy at those speeds it might just you opening the throttle a touch, or closing it.

Speed up

Depends on the gearing of cource....

Killerwhale wrote:

gregs656 wrote:55mph in top gear, it must be so lumpy at those speeds it might just you opening the throttle a touch, or closing it.

Speed up

Depends on the gearing of cource....

I suppose, but anything almost like stock gearing and you will have issues at those speeds in top gear I reckon.

hmmm dunno. my bike is happy down to 45 in top, but then I don't know what gearing it has!

youngy wrote:hmmm dunno. my bike is happy down to 45 in top, but then I don't know what gearing it has!

Time todo a count?!

I got to 10 and ran out of fingers ...............................next week, new front sprocket and seal going on.

youngy wrote:I got to 10 and ran out of fingers ...............................next week, new front sprocket and seal going on.

Never done the seal but actually ordered one, is it tricky??
In that case, bring your camera for us!

it's not tricky with the cases split...... ........shouldn't be too difficult methinks. we shall see!

youngy wrote:sounds like it's running a bit lean. could be a carb diaphragm split or not seated correctly. airbox stubs not on the carbs tightly. carb to head rubbers twisted or split. needle too low.????

perv owner put rebuilt carbs on it not long befor i got it off him i think he put some bigger jets in it as well as he put a k&n and scorpion cans on it. but i know it has not been dynoed as he got the TL at that point and just used the trx in inner london.
will have a look at the sprokets and count. but it sits there at about 4000 rpm, give it a twist and it pulls away well enough, it dose not bog down any way

brockzila wrote:perv owner

not perv it was ment to be prev as in prevous.
leave me alone i have mild lisdexia and fat fingers. i pre read that as well and i still thought it was fine

Killerwhale wrote:

brockzila wrote:perv owner

brockzila wrote:not perv it was ment to be prev as in prevous.
leave me alone i have mild lisdexia and fat fingers. i pre read that as well and i still thought it was fine

Killerwhale wrote:

brockzila wrote:perv owner

We do everything in here with a i hope but if it´s a touchy thing i´ll keep it shut!

brockzila wrote:

youngy wrote:it sits there at about 4000 rpm, give it a twist and it pulls away well enough, it dose not bog down any way

i'm sitting at about 70-75 at 4k, 55 for me is about 2.5k. If i can then 4.5k/5k 80-90mph is where the bike is most comfortable I find.