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XV1100 camshafts

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XV1100 camshafts

PostAuthor: jonno51 » Wed Feb 06, 2019 3:41 pm

A question:-
Are XV1100 and XV750 (2nd gen) camshafts interchangeable? I know the fronts and rears are different on the 1100s, but could you swap a set from a 750 into an 1100?

The part numbers are different - but they would be for different models, for the 95 model year 42H means 1100, 42X means 750

Front camshaft 1995 XV1100 - 42H 12181-00-00

Front camshaft 1995 XV750 - 42X - 12181 -00-00

The 00 means no changes during production run.

You can no longer get new ones from Yamaha, and as a result some breakers are asking big money for some well used looking camshafts.



Thanks in advance,

Jonno
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Re: XV1100 camshafts

PostAuthor: bstig60 » Wed Feb 06, 2019 6:24 pm

From the part numbers, I would say the 1100 cams will fit, but the lift and duration will probably be different. This appears to be the same part number for the 1100, 1000 and 920.
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Re: XV1100 camshafts

PostAuthor: nanno » Fri Feb 08, 2019 6:47 am

They are the same and maybe someone can make a sticky with the following infos:

Gen1: 700/750/1000 are the same, but 1mm larger basecircle than later cams, so they can be reground to different profiles with ease
Gen2: 750/1100 are the same, timing is the same as Gen1 due to the smaller basecircle they can only be reground to mild profiles (almost impossible to get more lift out of them, without welding them up)
Gen3: XVS/BT1100 small basecircle and overall tamer spacing

Hope this helps
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Re: XV1100 camshafts

PostAuthor: jonno51 » Sat Feb 09, 2019 4:19 am

nanno wrote:They are the same and maybe someone can make a sticky with the following infos:

Gen1: 700/750/1000 are the same, but 1mm larger basecircle than later cams, so they can be reground to different profiles with ease
Gen2: 750/1100 are the same, timing is the same as Gen1 due to the smaller basecircle they can only be reground to mild profiles (almost impossible to get more lift out of them, without welding them up)
Gen3: XVS/BT1100 small basecircle and overall tamer spacing

Hope this helps
Greg


Thanks Greg, exactly what I needed to know.

There is a NOS Gen 2 rear camshaft on eBay at the moment (USA) for less 25% money than breakers are asking for used items. If it's still there when I get back from holiday, I'll buy it.
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Re: XV1100 camshafts

PostAuthor: nanno » Sat Feb 09, 2019 5:59 am

You can always ask on the German TR1-Forum, for some bizarre reason, most of the guys are terrible hoarders on there. :;:

(I admit being one of them, but I only have one spare set of cams for three engines, so...)
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Re: XV1100 camshafts

PostAuthor: jonno51 » Sat Feb 09, 2019 9:22 am

nanno wrote:You can always ask on the German TR1-Forum, for some bizarre reason, most of the guys are terrible hoarders on there. :;:

(I admit being one of them, but I only have one spare set of cams for three engines, so...)


Thanks Greg, I might try them. A spare set makes sense, I might have them turned down to take a small bearing at the 'far' end where the camshaft sits in the head.
I've already done the ball race upgrade at the camchain ends and it feels much better even before you put the cam back in.

Does anyone have a reference number for the small bearing in question?
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Re: XV1100 camshafts

PostAuthor: nanno » Sat Feb 09, 2019 1:37 pm

I don't think (from a load bearing point of view) you would want to run it in ball bearings on both sides...
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: XV1100 camshafts

PostAuthor: jonno51 » Sat Feb 09, 2019 4:26 pm

nanno wrote:I don't think (from a load bearing point of view) you would want to run it in ball bearings on both sides...


I know other people have done it, but I'll follow your advice.
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Re: XV1100 camshafts

PostAuthor: nanno » Sat Feb 09, 2019 5:44 pm

No please don't simply follow my advice, but maybe think more about my concerns... Thing is, if you want to have a proper bearing in there, it should either be a needle bearing, which would make lubrication a bit difficult or you'd have to machine both the head AND the camshaft to squeeze in the largest ball-bearing possible. Considering the fact that normally these bikes don't have oilpressure issues, means you'll most likely have no benefit in decreased friction over the stock plain-bearing setup. Replacing the bushing with a proper ballbearing on the camchain side: absolute no brainer, I do that to every single XV-engine I lay my hands upon...
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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