I have a 1981 yamaha XS850S (3 cylinder) and when I'm in 2nd gear and give it gas it makes the bike jerk back and forth real quick. It does not do this in any other gear. Anyplace to start would help? Thank you.
2007-03-01 02:22:18 · 8 answers · asked by stripandship 1 in Cars & Transportation ➔ Motorcycles
Since it only happens in 2nd gear, I'd have to guess it has something to do with your transmission.
The groves in the shift drum, or the shift forks could be, or are showing the first signs of them wearing out.
They may not be allowing the trani gears to fully engage. When accelerating, the gears could be semi-disengaging because of the slop in the worn parts.
Second gear is the first gear to go bad on bikes.
Can you hear the gears grinding when the bike jerks? That's a sure sign.
2007-03-01 03:27:02 · answer #1 · answered by guardrailjim 7 · 1⤊ 0⤋
Does it seem engine/running related or transmission/drive train related. I suspect that you may have a slightly bent shift fork in the transmission, the one that moves the second gear. If so what is happening is that the bent or worn shift fork doesn't move the gear quite close enough to the next gear (gear dog engagement should be at least 50%). When you open the throttle and put the power to it the gear dogs slip/jump making your bike feel jerky. IF this is the problem it will keep getting worse every time you make it happen and the only cure is to replace the worn parts. Yes, it is a big expensive job. It could be something else of course, its hard to diagnose from an email. Take it to a shop and let an experienced mechanic take it for a ride.
2007-03-01 03:39:04 · answer #2 · answered by Anonymous · 0⤊ 0⤋
1981, there is no shame to have some trouble on a bike that old; just wind out first a little and skip over second gear, on a 850 you should have plenty of power for that.
2007-03-01 04:05:46 · answer #3 · answered by wrenchbenderottis 4 · 0⤊ 0⤋
the two previous solutions are maximum stunning, get a compression analyzing to be responsive to what is going on with the engine. If the engine became into rebuilt then compression should not be a undertaking. If compression is low then you could desire to discover out why. upload a teaspoon or so of oil to each and each spark plug hollow and retest that cylinders compression, if the compression got here up undesirable rings, if it did no longer undesirable seat on a number of of valves. widespread problems with the early viragos-starter kit, rear cylinder overheating and severe cam positioned on on the rear cylinder. Get a instruction manual-Clymer is extra suited then Haynes, yet Haynes is extra suited than no longer something. Get some trouble-loose approaches and commence going over the motorbike One final ingredient-the idle on that motorbike could desire to be somewhat larger than 1000 rpm. it is going to be approximately 1100-1200 rpm.
2016-10-02 03:59:28 · answer #4 · answered by Anonymous · 0⤊ 0⤋
850 had a mod on 2nd but it sounds like its broken. have to get inside engine to check. probably need 2/5th gear and gear selector
If you cant do it yourself its probably not worth paying a shop, just dropping engine out and removing bottom case is going to take a couple of hours before you put any parts in or re-build.
Depends what its worth to you
If it were mine I'd re-build it, but I have over 38 yrs experience
2007-03-03 19:02:52 · answer #5 · answered by 1crazypj 5 · 0⤊ 0⤋
Yamaha had problems with second gear in many of their products,I would bet your missing a few teeth on second...
2007-03-02 00:34:48 · answer #6 · answered by JONNEEU 2 · 0⤊ 0⤋
I'm thinking clutch is bad or fuel filter partly clogged
2007-03-01 04:39:22 · answer #7 · answered by nbr660 6 · 0⤊ 0⤋
you mite need Tran or clutch ajustedand change the spark plug try that first
2007-03-01 15:29:18 · answer #8 · answered by BONEs 2 · 0⤊ 0⤋