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xv1000 engine rebuild?

PostAuthor: motorlou » Wed Sep 12, 2018 10:09 pm

hi guys pretty much new here. i recently bought an xv1000 which i will be chopping up. have the project posted up in the chopper section. well, i briefly checked the compression on the engine just to see if there was any there. i place my finder in the hole and cranked. i have a compression tester but i didnt want to go back to the shop and get it. the rear had great compression but the front had very little. i took the valve covers off to see if the valves were getting stuck open but they were definately not. i didnt really delve much more into it being that the project will sit for a bit until j am ready to chop her. i am really i love with these viragos so i want to do this project right, i would like to rebuild the engine. my questions are if pistons and rings are still available, if so where could i buy them or if not how would i go about rebuilding it? any input appreciated

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Re: xv1000 engine rebuild?

PostAuthor: viragobober » Thu Sep 13, 2018 1:23 am

i think if you go to a local machine shop they can match up the rings to your pistons / cylinder im not 100% sure but they could probably find you some that will work wont hurt to go ask

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Re: xv1000 engine rebuild?

PostAuthor: Flyingdog » Thu Sep 13, 2018 1:34 am

Lotta places like, Dennis Kirk, J & P, MRC, Babbits, Partzilla, BikeBandit, etc etc etc..carry piston/ring kits. Some maybe OEM or aftermaket. But, of coarse, as with any internal engine rebuild, accurate measurement is a must.
https://www.yamahaofharrison.com/s/sear ... best-match

You should edit your profile to show general location. Would help people helping ya out.
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Re: xv1000 engine rebuild?

PostAuthor: nanno » Thu Sep 13, 2018 2:55 am

If yours is a 1000 and not an 1100, you're pretty much screwed in terms of pistons and rings from my experience. Unless someone started making oversize pistons and rings for the 1000 in the last two to three months. (As that was the last time I checked.) Oversize pistons and rings are available for the 1100s, BUT the gudgeon pin sits at a different height, so they don't fit. Sepp Koch never explained to me where exactly the difference between XV1100 and XV1000 piston rings was, but he told me they are different.

With regards to low compression, check whether the valves of the front cylinder have a lot of carbon buildup which can cause them to not seal right anymore. The other issue can be bent valves, which happens quite frequently as people seem to have great difficulties in following the manual on how to time these engines. (If you do, it's as easy to time as any other OHC engine. You just have to do it once per cylinder and the marks are on different sides.)

Sorry for the bad news.
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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: xv1000 engine rebuild?

PostAuthor: Flyingdog » Thu Sep 13, 2018 4:23 am

Never hurts asking around.... https://www.tr1.de/
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Re: xv1000 engine rebuild?

PostAuthor: nanno » Thu Sep 13, 2018 6:00 am

It doesn't unless you have one of the regulars of TR1.de overhere... :;:
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: xv1000 engine rebuild?

PostAuthor: motorlou » Thu Sep 13, 2018 6:32 am

thanks for the replies guys. i will look deeper into the engine when i get a minute. who knows it may not even need pistons maybe just rings or a valve job. measuring everything will definately take the guess work out of the equation

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Re: xv1000 engine rebuild?

PostAuthor: motorlou » Thu Sep 13, 2018 6:41 am

another question just for reference. how much meat can you safely bore out of the cylinders on these bikes? also what is the piston pin height for this model. surely there are other pistons out there that could fit.

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Re: xv1000 engine rebuild?

PostAuthor: nanno » Thu Sep 13, 2018 6:51 am

Safe is a relative term. 97mm pistons will work, from an engineer's point of view 98mm should work as well. With regards to pistons: Not much is known. When the 1100 is concerned all of a sudden XT600 pistons fit. But these sit 5mm lower. (Also XV1000s with the late style cylinders are very rare in Europe (where most of the TR1 scene is) and as such it was always easier to just convert to an 1100 crank, pistons and cylinders and go with 1063cc. The 1000 crank is lighter though.
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: xv1000 engine rebuild?

PostAuthor: uncleromo » Thu Sep 13, 2018 11:04 pm

According to the parts diagram at Yamaha Sport Plaza ( https://www.yamahasportsplaza.com/oempa ... aft-piston) XV 1000 rings are still available. The question is where to get pistons. If the cylinders are not too far out of round, I’d just have it honed and re-ring it.
UR

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Re: xv1000 engine rebuild?

PostAuthor: motorlou » Thu Sep 13, 2018 11:14 pm

i will definately look into this and log my findings as i move along this project. i am sure there has to be something out there that works without having to change the crank. if my bike is a 1985, would the heads and jugs be considered the "newer style"?

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Re: xv1000 engine rebuild?

PostAuthor: Flyingdog » Thu Sep 13, 2018 11:52 pm

nanno wrote:It doesn't unless you have one of the regulars of TR1.de overhere... :;:


Yea..forgot bout that.. :;:
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Re: xv1000 engine rebuild?

PostAuthor: nanno » Fri Sep 14, 2018 2:10 am

motorlou wrote:if my bike is a 1985, would the heads and jugs be considered the "newer style"?


Yup. Which basically means, you have the normal MLS-type headgasket instead of the asbestos-ring the older TR1 models had.
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

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: xv1000 engine rebuild?

PostAuthor: motorlou » Fri Sep 14, 2018 8:44 pm

sweet, sounds like thats a good thing. anybody done some hot roddimg mods to these engines to get a few more ponies?

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Re: xv1000 engine rebuild?

PostAuthor: nanno » Sat Sep 15, 2018 1:36 am

Please use the search function or look for my engine building thread "the mule" ;-)

In short: keep the xv1000 rotating assembly if the cylinders and pistons are still good (mind you they came on the very top of the loose side clearance-wise, so no need to worry if you're there or slightly beyond), bump up the compression with different heads (either the welded up heads seen in the post for max. performance or some 700/750 heads but live with the fact that at 6000rpm your engine will get breathing problems due to the smaller ports, get better carbs, e.g. dual Mikuni VM38-9 round slides or TM38-85 flat-slides and a free-flowing exhaust. The 2in1 Mac except for its poor material and fabrication quality is a nice step in the right direction. I (for obvious reasons) prefer my own exhausts, as I build them exactly for the requirements I have in mind with every individual engine.

As an addendum to the thread I have one last set of welded up heads available, but currently no exhausts and also will not take orders until December as I am booked out.

If you really want to get funky... think about turbos. (And yes I did that too in the past... so if you need some pointers in that direction, I should be able to help. But don't expect too much from it, the engine does lend itelf very well to forced induction from a c/r point of view, but the wide spacing between the individual exhaust pulses is a big limiting factor to the amount of power you can make.)
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: xv1000 engine rebuild?

PostAuthor: motorlou » Sat Sep 15, 2018 11:24 am

yeah i was totally thinking something like a turbo. sounds kinda crazy but i envision building a 70s style chopper with king/queen seat, 4-6 inch over telescopic forks and a softail frame. i can see myself pulling up at a light a smoking a few bikes on my old school chop ha ha ha

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Re: xv1000 engine rebuild?

PostAuthor: motorlou » Sat Sep 15, 2018 2:09 pm

a couple years back i was in new zealand working for a year. i went to a local chopper show there and saw this kawasaki turboed engine in a harley sportster frame. i can imagine this xv1000 being something simular. kinda just an oddball like that......


Image

Image

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Re: xv1000 engine rebuild?

PostAuthor: nanno » Sat Sep 15, 2018 3:17 pm

More like so. :cl:

Image

Image
Last edited by Jake on Sat Sep 15, 2018 10:19 pm, edited 1 time in total.
Reason: Images too big, changed to thumbnails
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

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: xv1000 engine rebuild?

PostAuthor: motorlou » Sat Sep 15, 2018 7:06 pm

hell yeah getchy sum!! what kinda numbers is that engine pumping? hp/torque and also 0-60mph?

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Re: xv1000 engine rebuild?

PostAuthor: Hellgate » Sat Sep 15, 2018 8:48 pm

motorlou wrote:sweet, sounds like thats a good thing. anybody done some hot roddimg mods to these engines to get a few more ponies?
What Nanno said, use the search. I'm at 75 to 80 hp. Look in the XV920R section.

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