At witts end with a weird acceleration problem...

[Damon]

Hi all, Got a bit of a problem.

Ever since I have had my R1 there has been a problem with it "jumping" under full load. It happens in first, second and sometimes third gear, but only when the throttle is pretty much to the stop and under hard acceleration.

It feels like the bike actually kicks underneath me and then feels fine. It kicks everytime the throttle is pinned at about 6 - 9 thousand RPM.

At first I thought it was the clutch, but I have replaced the plates and it was no better. I have also replaced the chain and sprockets, plugs and it gets new oil + filter every few months.

It's getting to the point now that after every corner I have to wait for it to kick before I can really settle down attack the next corner.

Does anyone have any idea? I will be more than greatful and am willing to send over some beer money to say thanks. It's stopping me from enjoying the bike. It really kicks sometimes and coming out of corners when it kicks is a nightmare...

Thanks,

Damon

[instigator]

Gearboxes are a weakness on early R1's, precisely why I've always avoided them. Let's hope I'm wrong.

It's jumping out of gear under heavy load and only in the first three gears, I'd hazard a guess that all three cogs have been butchered.

[Benson_JV]

Could it be the 'powerband'?
____________________
Willson - "If you go out on that CBR600 in the winter, you're going to do more miles on your side than on your wheels."
Riding: CBR600FW Driving: Audi A6
Previous Bikes: '96 Bandit 600, '96 GPz305

[Pete.]

[Benson_JV]

Oh har har.
____________________
Willson - "If you go out on that CBR600 in the winter, you're going to do more miles on your side than on your wheels."
Riding: CBR600FW Driving: Audi A6
Previous Bikes: '96 Bandit 600, '96 GPz305

[Damon]

[Acemastr]

if it's carbs it could be overfuelling at certain revs with the throtttle pinned and then clears and is fine. someone will correct me though
____________________
2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
2016 Toyota Tacoma Limited

[L4Isoside]

[Damon]

[0l0dom0l0]

when was the last time you replaced the air filter? if you havent done so, change it for a k&n one.

if it has been replaced recently, i would just go over and make sure it all looks ok. but if it doesnt have a k&n, fit one. they are very good at removing these kind of problems!

[finpos]

If it feels exactly like the chain is jumping a tooth, and it's happening more and more frequently over time, then it's the dogs on your gears starting to round off. Under load, the rounded dogs slip off each other, the gear now spins freely until some dogs line up again which smash into each other with great force and take up the drive again. You can imagine how much good that does it.

Nothing much to be done about it short of rebuild the gearbox if that's the problem. Never cheap.

f.

[L4Isoside]

[danjameswhitt]

[Fortuna]

Before I jump the gun and say effed gearbox, it's worth checking the regulator/rectifier first.

Here's how I rebuilt mine Clicky

[Damon]

[Damon]

Yeah I have tried that. It only happens once when I am accelerating from a slow speed to a high speed. For example, I will pin it from a stand still in first. It will kick once at around 60mph and then won't kick again in second, third etc until I slow down again.

If I short shift into second and then pin it, it will kick at about 80 - 100mph and not kick in 3rd or again until I slow again (braking for a corner etc)

[danjameswhitt]

Now it would appear I was trying a little too hard to be funny, and over looked the fact I have no clue what the heck i'm going on about when it come to maintainance issues!

I'll get my coat and go outside and give myself a kicking for trying to be a smart arse

something called 'dogs' on a bike, who'd a thunk it!

[Fortuna]

By what you have just posted I would say worn dogs.
And yes it feels like it's kicking especially under load.
Find a steep hill and go into 2nd gear. Pin the throttle and tell us if it does it. Try a few times to be sure.

[ram_doom]

Worth checking coils/plugs and throttlebodies surely?
____________________
TL1000s, KDX200

[Damon]

[Wafer_Thin_Ham]

[Pete.]

[Damon]

Thanks for the link. I'm gonna buy each gear new I think and go from there. The cogs posted may have the same problems as mine has currently. Hopefully it's only 1st, 2nd and 3rd that need doing

That's if it is the gearbox that is.


I didn't manage to get out on it today but will try the hill sprints tomorrow if i get a chance and post back.

Thanks again for all help guys

[Damon]

Update:

I went out on the bike yesterday to see if it would jump and kick any more under hard acceleration on a steep hill. Well, instead of doing the above I found myself practicing my power wheelies with the new quick action throttle Eneded up at nandos, then more 1 wheel action and home for a cup of tea.

It wasn't until I got home I realised I hadn't done any hill work and/or anything I was supposed to.

Oh well, there is always tomorrow