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Dual VM38-N9's for my '84 700

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Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Thu Mar 08, 2018 6:58 pm

I picked up a couple of Mikuni VM38's and a 2-1 throttle cable for my 700, they should be here in a couple of days. Once they get here, the retrofit begins.

Here are the specs:
VM 38mm N9
Slides: 2.5
Needles: 6DP
Pilot Jets: 22.5
Main Jets: 330
Needle Jets: 166 Q2 (atomizers)

Does this seem like a good place to start, as far as the jetting is concerned?
It will be good to get the old girl out of her Hitachi induced slumber...
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: nanno » Fri Mar 09, 2018 1:46 am

I run my TR1.1 (TR1 with 1100 conversion) with 20 pilots and 170 mains on a homegrown 2in1in2 exhaust with rather limited "muffling". For connecting the carbs to the frame I use 54 to 63mm stepup, 90 degree silicone elbows as used for fitting intercoolers on cars. I run a stock airfilter replacement from K&N for the stock airbox, but without the outer lid.

You can sort of see the setup in this picture:

Image
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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Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Sat Mar 10, 2018 6:48 pm

My 2-1 cable came in yesterday, and my carbs came in today. Once the inlets come in I can get started on the conversion. I know I'll have to clean and flush the tank, also. It's been sitting for several years because I was sick of messing with the original Hitachi's on it.
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Wed Mar 14, 2018 3:15 pm

Carbs, cable, and inlets are here. I have not ordered the elbows yet because I'm waiting to see how things fit on the bike. I may just use a couple of pod filters. Once I get them on the bike I'm sure I'll have some jetting/tuning questions.

Dave
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Sun Mar 18, 2018 6:51 pm

I got out in the garage and piddles with the Virago this evening. I got the old Hitachis off, and really had to resist the urge to chuck them into the woods... The Mikunis, intakes, and throttle cable all fit well. I will have to swap the choke levers out for plungers at least. Are there any cable chokes for these? Even the plunger chokes will not be accessible if I reinstall the pods. All of the work that I put into painting the tank is ruined now. At some point, the gas in the tank started lifting the paint under the fuel petcock at it leaked past the gasket, lifting the paint all along the bottom. I guess I used the wrong type of primer. Sucks, but I'll have to completely strip the tank and start over. The inside of the tank also got rusty, so that will have to be cleaned and sealed as well. I've used KREEM in the past and was less than impressed.

Dave
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: nanno » Mon Mar 19, 2018 7:49 am

Choke-Knobs out of the TM- and TMX-Series will work. Check out nichecycle, I think they even have the correct conversion listed. Cable-chokes are (of course) available.

I flushed my tank (after degreasing) with nitric acid and that was the end of the problem as HNO3 will form a (relatively) solid oxide and seals the tank. It doesn't look as nice, as it turns black-ish a bit.
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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Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Mon Mar 19, 2018 8:09 pm

OK, I found some conversion kits to make them cable operated. I'm thinking about trying to mod the existing choke lever on the handlebars to operate the chokes on these carbs. I'm thinking something similar to the throttle cable should work, but the springs in the carbs may be enough to pull the choke off if I don't hold the lever. Something else to experiment with. I'll get some pics posted soon.
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: nanno » Tue Mar 20, 2018 7:33 am

Otherwise just get a 2in1 cable splitter and solder your own cables. I did just that on my sidecar (Yamaha XS750 with 3 individual VM36 carbs... just swapped in the lower half of a left-hand TR1-switch cluster to have the perch for the choke cable.)
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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nanno
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Joined: Thu May 26, 2011 4:06 pm
  Flag
Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Tue Mar 20, 2018 7:16 pm

I just ordered a new Raptor petcock, and the KBS Coatings tank liner kit. I'll order a set of the elbows once I confirm the diameters of the frame and carb end. The stock elbows ALMOST fit, though. They are on and in place, but they are too small on the carb end. They're a little too stretched, and not on far enough to clamp in place.
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Thu Mar 22, 2018 5:50 pm

The Hitachi's are mounted, and the original elbows almost fit.

20180322_174404.jpg
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'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Fri Mar 30, 2018 9:02 pm

Duh! Previous post says Hitachis mounted... Obviously Mikunis... Anyway, choke conversion parts came in today, and 1-2 cable housing for the choke cable is on order.
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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Re: Dual VM38-N9's for my '84 700

PostAuthor: cozwurth » Sun Apr 08, 2018 8:11 pm

I got the 2-1 cable adapter for the choke cable, and I picked up a set of bicycle brake/shifter cables from Walmart the other day. I have the cables fitted to the carbs, and the choke lever on the handlebars, I just need to get the cables trimmed and the 2-1 adapter hooked up. I'll have to figure out how to get all of the cables hooked up in the adapter, there has to be a trick to getting them all in place. Pics soon...
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)
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