A 'Quick and Dirty" Yamaha XV 920 Virago custom (cafe racer?.... not)

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Re: A 'Quick and Dirty" Yamaha XV 920 Virago custom (cafe racer?.... not)

Post  turbodog on Sat 15 Oct - 15:39

I'll post up the EFI stuff as I get some momentum going. So far mostly gathering the parts needed.
Yah, trying to turbocharge with 30 year old CV carbs would be a nightmare. The EFI makes it much easier to get the fueling right. It also will control the ignition. The stock ignition module is too weak, and the timing curve is all wrong for forced induction. You have to pull timing out as boost goes up, or the engine goes 'boom'. Too lean at full boost, and the engine goes 'boom'. I only have 1 spare engine (and I would sort of like to see that engine in this silver bike someday), so cannot be having any 'booms'.

Well, I will be taking the silver girl to a small local vintage bike show and swap meet today. If I get even one "lose the stupid scoops" comment, I will take them off. Not that your opinion isn't just as valid as theirs... but my 'girl' will hear them! She does not know how to read study

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Re: A 'Quick and Dirty" Yamaha XV 920 Virago custom (cafe racer?.... not)

Post  Luckyboy on Sun 16 Oct - 1:48

And so you will have 'one throttle body / butterfly' like a one into two manifold.. as per ur silver..
and the injuctor will sit behind the butterfly, (motor side).. I will wait for you to get it organised ok.
Pleasing to see you have all the good info.. for us to learn and me to copy.

Yes advice and opinion gathering is like handing ur bike over..
we have our say, in good mannered way, for the most part..
but since the bike is yours, you have all ther power and can do as you please.. me too, we all do.
The scoops look fine, but to me they seem to not blend in with tank / seat / tail..
I chromed the front mount and looks fine and strong.

Your build is for sure the most exciting XV motor event I can find on the Net..
I hope it goes smoothly and not explode, I guess cylinder sealing may be an issue..
I think they o ring the block.. ?? anyway you will know all that.
luck with it.




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Re: A 'Quick and Dirty" Yamaha XV 920 Virago custom (cafe racer?.... not)

Post  turbodog on Thu 24 Nov - 20:19

Got tired of the silver...






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Re: A 'Quick and Dirty" Yamaha XV 920 Virago custom (cafe racer?.... not)

Post  turbodog on Tue 28 Aug - 2:22

OK, I know by now that I should have the fuel injection and turbo all done. However, I realized that my turbo plans are depending on my 'upside down' rear suspension to work and be reliable. So, to test this, I bolted the front and rear suspension onto my daily driver. Of course, to do this was a 'little' more complicated than just bolting on the suspension. I had to convert to a chain drive engine, which I have never seen run. I think it was sitting for at least 10 years. But, it does run, and I have gone around the block twice for shakedown testing. Here's some pics:

Engine and suspension on:


Bodywork on. Note the increased rake. I changed the angle of the frame on the engine to achieve 25 degree rake:



Almost done!



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Re: A 'Quick and Dirty" Yamaha XV 920 Virago custom (cafe racer?.... not)

Post  Luckyboy on Thu 29 Nov - 9:38

Wow I wish I was half as capable..
Please keep us informed.
Well done. Basketball

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Re: A 'Quick and Dirty" Yamaha XV 920 Virago custom (cafe racer?.... not)

Post  turbodog on Thu 29 Nov - 15:27

Thanks. I put 300 miles on the bike in that form, and proved that the rear suspension works. But, the engine (I bought cheap for a spare) is an oil leaker. And has low compression. After trying to fix the leak twice, I retired it. I will rebuild it later. So, now I am working hard to finish my original project, the XV920R resto-mod (fuel injection and turbo) by spring.

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