I've just picked up an ally swinging arm off tenereless tom; captain brightideas here thinks it might be transplantable into a 1VJ fram, thereby giving me a (small) reduction in unsprung weight... And also it just seems like a good idea at the time...

A good browse through the back messages doesn't really throw up much about this swap, except this thread which shows that the early swinging arm pivot pin is shorter than the later one.

SO: does anyone have any ideas about the swap? xt600.de seems to suggest that it's tricky due to chain alignment issues, but my german's not good enough to work out how - they suggest that it's hard to transplant a 34l/55w engine into a 1vj frame for this reason.

At the moment i'd like to know the following:

1. what's the measurement across the back crankcase boss on a 1vj? Is the 34l/55w different?
2. what's the outside measurement across the swinging arm pivot of a 1vj?
3. has anyone tried this already?

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1979 LeMansII
1981 LeMansII
1981 Monza
1987 XT600 1VJ
1997 SZR660
1995 NTV650

"Why do it? Because we can, and we want to." Guiseppe Benelli

Hello, I would suggest you compare the pivot bushes from your 1VJ swingarm and see if they are the same length as from the 33L/55W. If they are then there is a good chance the swingarm will fit.
Even as standard there are shims at the outside end of the swingarm pivots (under the dust caps) to allow minor adjustment of the swingarm alignment (chain alignment). So you still have a few mm to play with.
You might have to swop parts (bushes, caps, pivot bolt etc) between each swingarm but I'm sure it can be done...

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rust & dust

try the following:
(but put http in front of the colon at the start of the address)
Hope you can read french if you can't read german....but plenty of pics.


://600xt.bbfr.net/les-preparations-f7/montage-bras-alu-de-43f-sur-2kf-t2915.htm?highlight=bras

I've babelfished my way through it and they seem to suggest it's possible.... I can't work out what the author's done about the extra space which seems to be there between the ally swinging arm and the frame - it seems to suggest that there's a centimeter or so difference, but it's not clear how they take this clearnce up.....

__________________
1979 LeMansII
1981 LeMansII
1981 Monza
1987 XT600 1VJ
1997 SZR660
1995 NTV650

"Why do it? Because we can, and we want to." Guiseppe Benelli

Hi, I'm not sure what your madel has but generally the motors with electric start are 10mm wider than kickstart only models (swingarm pivot is 240mm vs 230mm) due to the bendix clutch behind the flywheel. The rest of the bearing setup is the same, the late model 'e' bikes still have the bits on the castings to take a kick start and auto decomression cable. I helped a mate fit an ali xt600 swing arm to his 1VJ and we had to make a 10mm spacer for the LHS of the swingarm, don't know if chain alignment was a problem as I left that up to him to sort out but he has been ridib=ng it about without complaint.
Dave

That's a really interesting one dave - I'm trying to do exactly the same job as your friend with an ally swinging arm in the 1vj frame. If he's got any photos of the job, that'd be really helpful...

__________________
1979 LeMansII
1981 LeMansII
1981 Monza
1987 XT600 1VJ
1997 SZR660
1995 NTV650

"Why do it? Because we can, and we want to." Guiseppe Benelli

No problems, I'll give my mate a call and see if he can take a few photos of the bike.
Dave

thanks muchly -

__________________
1979 LeMansII
1981 LeMansII
1981 Monza
1987 XT600 1VJ
1997 SZR660
1995 NTV650

"Why do it? Because we can, and we want to." Guiseppe Benelli

Did you manage to fit the swingarm ?

__________________
rust & dust