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Author Topic: XS750 to XS896 big bore  (Read 42969 times)

Offline datadavid

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Re: XS750 to XS896 big bore
« Reply #250 on: Sep 27, 2017, 03:39:19 »
No, 1st should not jump out. Is the rest of the gears ok? Could be worn or loose detent plunger(easy) or worn gear selector scroll.

Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #251 on: Sep 27, 2017, 07:08:22 »
Quote
No, 1st should not jump out.
Dave, I totally agree with you! I am starting to change my theory after thinking about it some more. If it was jumping out of gear then it would just jump out and do nothing.
It is only happening when leaving the lights when there is maximum load up to get the bike going, once rolling and in higher gears it is working OK. It is a real "bang" out and in, without me needing to re-engage the gear!!
I am starting to suspect it might be a failed or failing compression spring (item 43) for the transmission drive cam (items 40 & 41). Once again I have never heard of a failure in these parts???
If it is, then it is much easier to fix as I just need to remove the final drive. But it can wait, as I don't need a distraction to delay getting the 896 finished.
Any other thoughts or theories appreciated.
« Last Edit: Sep 27, 2017, 08:00:33 by XS750AU »
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
Husaberg FE550
Yamaha TT250
Yamaha IT200N

Offline teazer

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Re: XS750 to XS896 big bore
« Reply #252 on: Sep 27, 2017, 11:32:56 »
Jumping out and then back in any gear is  a problem of dog engagement.  That could be from a worn or bent shift fork or worn dogs on that pair of gears. More common on 2nd or 3rd which get more use, but can happen on any gear pair.

Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #253 on: Sep 27, 2017, 19:41:50 »
Quote
Jumping out and then back in any gear is  a problem of dog engagement
Yes agree with you. I stripped the engine and transmission completely less than 1000Km ago and fixed an issue with 2nd gear jumping out. That was caused by the circlip on the layshaft that controls 2nd gear thrust being pushed up and out of its groove. That was fixed with a new circlip and assembled with the pressure radius on the circlip facing the gear. At the time I checked the shift forks and selector scroll and they were perfect with no visible wear.
I have a spare set of gearbox internals, so I am ok for parts. As with most of us, I am just lacking time!!!! The failure mode did not feel or sound like the gear dogs, but time will tell.
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
Husaberg FE550
Yamaha TT250
Yamaha IT200N

Offline datadavid

  • Posts: 1317
Re: XS750 to XS896 big bore
« Reply #254 on: Sep 27, 2017, 20:20:59 »
Dave, I totally agree with you! I am starting to change my theory after thinking about it some more. If it was jumping out of gear then it would just jump out and do nothing.
It is only happening when leaving the lights when there is maximum load up to get the bike going, once rolling and in higher gears it is working OK. It is a real "bang" out and in, without me needing to re-engage the gear!!
I am starting to suspect it might be a failed or failing compression spring (item 43) for the transmission drive cam (items 40 & 41). Once again I have never heard of a failure in these parts???
If it is, then it is much easier to fix as I just need to remove the final drive. But it can wait, as I don't need a distraction to delay getting the 896 finished.
Any other thoughts or theories appreciated.
You may have something there..i recall using the later, solid unsprung version in my middle drive. Probably changed the design for some reason.

Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #255 on: Sep 27, 2017, 21:36:14 »
Quote
i recall using the later, solid unsprung version in my middle drive
Hi Dave - was you bike an 850 or a 750 to start??
The 850 does not appear to have the transmission cam.
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
Husaberg FE550
Yamaha TT250
Yamaha IT200N

Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #256 on: Oct 03, 2017, 22:46:19 »
Oh Shit!!!! Got to sand it back again!!!!! :-[
My fault - I left the tank with the base silver for a week, and then put the last coat of silver on (rubbed with Prepsol but should have given a light sand). :'(
I then put a clear coat before masking for the red patch.
When pealing the mask off, it has lifted the clear and last coat of silver  >:(
I have enough paint, I have 1200 wet sanding paper, now it is just time!!!
I have certainly learnt from the experience.
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
Husaberg FE550
Yamaha TT250
Yamaha IT200N

Offline datadavid

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Re: XS750 to XS896 big bore
« Reply #257 on: Oct 05, 2017, 03:41:11 »
Hi Dave - was you bike an 850 or a 750 to start??
The 850 does not appear to have the transmission cam.
Mine was a 1978 750, though it came with a pile of parts for originally 3 engines. Late 750's also got rid of that thing i think. Although i have a bunch of springs and cams left over if you just wanna change the parts.

Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #258 on: Oct 05, 2017, 06:56:58 »
Thanks Dave
I have ordered a NOS spring, but I will wait and see what the damage is before I get any other parts. As I said, it can wait until I have the 896 finished.
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
Husaberg FE550
Yamaha TT250
Yamaha IT200N

Offline datadavid

  • Posts: 1317
Re: XS750 to XS896 big bore
« Reply #259 on: Oct 05, 2017, 13:50:35 »
Good call. 896's are awesome😃