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BT 1100 Bulldog engine on Virago 750 '82 ???

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BT 1100 Bulldog engine on Virago 750 '82 ???

PostAuthor: sale3010 » Tue Oct 16, 2018 8:15 am

Hello,

does anyone knows that the engine from BT 1100 Bulldog can fit on the frame of the Virago 750 '82 ?

Thanks
Sasa
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Re: BT 1100 Bulldog engine on Virago 750 '82 ???

PostAuthor: faffi » Tue Oct 16, 2018 1:52 pm

One member fitted a bt1100 or xvs1100 engine and found that it would fit the frame just fine. However, the driveshaft ouput is offset much further to the left, meaning you cannot use the stock swingarm in any way. Meaning you will need a one-off swingarm made based on the bt or xvs, plus the rear wheel off a bt or xvs.
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Re: BT 1100 Bulldog engine on Virago 750 '82 ???

PostAuthor: mark75 » Tue Oct 16, 2018 3:22 pm

technically --- anyone with enough money and time, can put any engine in about any frame. just sayin'...
"Over the Mountains of the Moon,
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Ride, boldly ride" ... E.A. Poe

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Re: BT 1100 Bulldog engine on Virago 750 '82 ???

PostAuthor: nanno » Tue Oct 16, 2018 3:51 pm

The rear engine mounts don't line up. In order to fit the engine cases into an XV-frame, some rather extensive mods are required. In short, it would be easier to modify the XV750 engine cases to accept the BT1100 internals. as that would mostly boil down to boring out the crankcase-mouths, so that the BT1100-liners fit.

Cheers,
Greg
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: BT 1100 Bulldog engine on Virago 750 '82 ???

PostAuthor: sale3010 » Mon Oct 22, 2018 2:54 am

Seems to be too much trouble replacing the engine.
I give up on that idea
thank you all for the information


nanno wrote:The rear engine mounts don't line up. In order to fit the engine cases into an XV-frame, some rather extensive mods are required. In short, it would be easier to modify the XV750 engine cases to accept the BT1100 internals. as that would mostly boil down to boring out the crankcase-mouths, so that the BT1100-liners fit.

Cheers,
Greg
Yamaha YZ 250
Yamaha XT 600
Yamaha Fazer 600
Yamaha R6
Honda CBR 1000 RR
Suzuki GSXR 750
Yamaha R1 -in the garage :)
Yamaha XV 750 - in the garage :)
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Re: BT 1100 Bulldog engine on Virago 750 '82 ???

PostAuthor: nanno » Mon Oct 22, 2018 8:24 am

The simple swap is a Virago 1100 or Midnight Special 1000 engine. That's just engine in and out (for the 1000) and plus an ignition swap on the 1100.
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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1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: BT 1100 Bulldog engine on Virago 750 '82 ???

PostAuthor: faffi » Mon Oct 22, 2018 2:41 pm

The 1100 engine is more involved because you must replace the engine mounts, the clutch cover doesn't allow the use of the stock footpegs and rear brake pedal, the coils don't interchange and the ones from the 1100 is difficult to fit into the front engine mount cavity. Also, the wiring are quite different - I opted to use that off the 1100 while also using bits from the stock harness since I kept the instruments and fuse box from the XV750SE. All time consuming.

The XV1000SE engine should bolt straight in, just needing some small jetting changes made to the carbs. The (European) tests I have suggest the XV1000SE engine had the best performance of the Virago lot. The XV1000 Gen II will have the correct clutch and -cover, but the rest will be like the XV1100 AFAIK.
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