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DUAL Mikuni TM38 flat slides Part 2

P901 Single carb intake, FLAASH Cams, Super Charger, NOS.......
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: tymck7 » Thu Oct 26, 2017 9:35 pm

Update: These carbs seem to be pretty close to right on, just like DGA mentioned. I have the needles all the way raised, and I swapped out the needle jet for a Q4. I didn't change the main or the pilot jets. Air mixture screw is about 2.5 turns out I believe. May be a little on the rich side in the mid-range, but it's a little chilly out side in the mornings right now (35 degrees Fahrenheit). So... I think they're doing pretty good.
'83 xv750 converted to '83 xv920..
Done: TR1 tank, removed stock airbox, 2-1 exhaust, brat subframe and seat, R6 front end, dual mikuni TM38-85's.

Plans: XT600 rear shock, 700 heads, rear wheel 17" 900 XJ Diversion complete with disk brakes, C5 ignition, BT-05 cam and anything else cool I read about on here.

Gracias a todos!
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: tymck7 » Fri Oct 27, 2017 4:05 pm

It's been a few days, and I switched out the Q2 needle jets for the Q4. I also threw on a mac 2-1 exhaust. My needle is still raised all the way. 22.5 pilot jets that came on the carb. 2.5 turns out on the air screw. Runs great, until I get up to about 4K RPM on the freeway, revs are slow past that point. I'm thinking I'm on the lean side of the main jet, so I'm probably going to grab a size or two bigger and give that a try. I'll let you guys know, but I think these carbs will work great on all the 920's out there..
'83 xv750 converted to '83 xv920..
Done: TR1 tank, removed stock airbox, 2-1 exhaust, brat subframe and seat, R6 front end, dual mikuni TM38-85's.

Plans: XT600 rear shock, 700 heads, rear wheel 17" 900 XJ Diversion complete with disk brakes, C5 ignition, BT-05 cam and anything else cool I read about on here.

Gracias a todos!
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: briandk » Tue Oct 31, 2017 10:39 am

tymck7: what cable did you end up using? (sorry if you wrote it somewhere and I missed it), I just ordered a pair of TM38-85s and will also be using the on a xv920 (well tr1, but still) with R6 forks.
Last edited by briandk on Tue Oct 31, 2017 5:17 pm, edited 1 time in total.

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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: tymck7 » Tue Oct 31, 2017 4:48 pm

Long story short: I am going to put this one on tonight or tomorrow:
https://www.denniskirk.com/parts-unlimi ... d/1925.sku
but I haven't fitted it yet. I'll let you know before the weekend, should work.

I tried this one:
https://www.denniskirk.com/parts-unlimi ... d/1924.sku
Even though is says it is for 38mm carbs, it didn't have enough exposed cable to hook to my throttle.

I currently have this one on:
https://www.amazon.com/gp/product/B014F ... UTF8&psc=1
and it is pure garbage.

I'm working on figuring out the main jet size that works best for me too, when I get it sorted out, I'll post.
'83 xv750 converted to '83 xv920..
Done: TR1 tank, removed stock airbox, 2-1 exhaust, brat subframe and seat, R6 front end, dual mikuni TM38-85's.

Plans: XT600 rear shock, 700 heads, rear wheel 17" 900 XJ Diversion complete with disk brakes, C5 ignition, BT-05 cam and anything else cool I read about on here.

Gracias a todos!
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: briandk » Wed Nov 01, 2017 8:04 am

tymck7 wrote:I'm working on figuring out the main jet size that works best for me too, when I get it sorted out, I'll post.


Excellent. I almost bought the amazon one, so it's great to know what to avoid.

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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: tymck7 » Wed Nov 01, 2017 12:48 pm

It works, but it doesn't have threads on the carb connections, and the cable is literally just rubbing on the lip of the thread top of the carb on each side. The other ones from Denniskirk.com are weird because the throttle end of the cable is not a simple cylinder shape like normal, but has square flanges that you have to knock off of the lead ball at the end. ...So that's kind of a pain.
'83 xv750 converted to '83 xv920..
Done: TR1 tank, removed stock airbox, 2-1 exhaust, brat subframe and seat, R6 front end, dual mikuni TM38-85's.

Plans: XT600 rear shock, 700 heads, rear wheel 17" 900 XJ Diversion complete with disk brakes, C5 ignition, BT-05 cam and anything else cool I read about on here.

Gracias a todos!
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: tymck7 » Thu Nov 02, 2017 6:42 pm

Alright the Dennis Kirk throttle cable definitely isn't plug and play. I'm trying to make it work, but I've had to take like 3 inches off of the cable housing, and it still doesn't have enough exposed cable to connect to the throttle I'm using. If anyone has any good ideas for a dual throttle cable that'd be helpful.
'83 xv750 converted to '83 xv920..
Done: TR1 tank, removed stock airbox, 2-1 exhaust, brat subframe and seat, R6 front end, dual mikuni TM38-85's.

Plans: XT600 rear shock, 700 heads, rear wheel 17" 900 XJ Diversion complete with disk brakes, C5 ignition, BT-05 cam and anything else cool I read about on here.

Gracias a todos!
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: nanno » Fri Nov 03, 2017 2:33 am

I run this one with my VMs, if you just search via the product number, you'll be able to find it from a US distributor as well, seems to be a generically made cable.

http://www.heidentuning.com/p/28/3402/m ... -cable-2-1

Make sure you lube them properly as they come completely dry.

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

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: briandk » Fri Nov 03, 2017 9:28 am

nanno wrote:I run this one with my VMs, if you just search via the product number, you'll be able to find it from a US distributor as well, seems to be a generically made cable.

http://www.heidentuning.com/p/28/3402/m ... -cable-2-1



Thanks nanno. I ordered from heidentuning.com. They where available locally in Denmark, but cheaper from Netherlands.

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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: tymck7 » Fri Nov 03, 2017 9:44 am

Thanks Greg, I'll check them out. Mikesxs.net has some in the US too.

Side note, the reason that the cable from Dennis Kirk isn't plug and play is because it's a snowmobile throttle cable... I should've read the fine print a little closer :/
'83 xv750 converted to '83 xv920..
Done: TR1 tank, removed stock airbox, 2-1 exhaust, brat subframe and seat, R6 front end, dual mikuni TM38-85's.

Plans: XT600 rear shock, 700 heads, rear wheel 17" 900 XJ Diversion complete with disk brakes, C5 ignition, BT-05 cam and anything else cool I read about on here.

Gracias a todos!
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: jimbo_on_travels » Wed Nov 15, 2017 12:04 am

Does the heiden tuning throttle cable work with clipon handlebars in a typical cafe racer setup ? My current dual pull TM40 setup has an unintended 'auto-blip' feature ^_^

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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: nanno » Wed Nov 15, 2017 3:51 am

I can only speak for VMs, but I run nearly 1m wide bars (3 feet) and the cable is definitely not too short, so it should work with clip-ons. That being said, the same cable can be had from various shops, so unless you're in Europe, you just have to find an XS650 in your part of the world selling the same 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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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: tymck7 » Thu Nov 16, 2017 12:00 pm

A note on jetting for 920's:

I put a larger #240 mainjet in both carbs, and the top end revs much higher, more power too. #250 might even be the way to go, I'll give it a try and see..
'83 xv750 converted to '83 xv920..
Done: TR1 tank, removed stock airbox, 2-1 exhaust, brat subframe and seat, R6 front end, dual mikuni TM38-85's.

Plans: XT600 rear shock, 700 heads, rear wheel 17" 900 XJ Diversion complete with disk brakes, C5 ignition, BT-05 cam and anything else cool I read about on here.

Gracias a todos!
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: cozwurth » Sat Dec 02, 2017 10:57 am

What is the stock application for these carbs? My 700 is still in a Hitachi induced hibernation, but I would like to start looking around for some carbs. Either flat slide or round slide would be fine with me. I'd like to get the old girl back on the road, but I am DONE with the OEM carbs on this thing.

Dave
'84 Yamaha XV700 Virago
'85 Honda VF700 Sabre (SOLD)

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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: nanno » Sun Dec 03, 2017 3:24 am

There isn't really a stock application for these carbs as they are aftermarket-only items. A technically somewhat related carb is the one fitted to a Suzuki DR600 (early models, later ones ran CV-carbs), which is called a VM38SS (but in fact is a TM-carb).

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

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Re: DUAL Mikuni TM38 flat slides Part 2

PostAuthor: cozwurth » Sun Dec 03, 2017 8:55 am

Thanks, Greg.
That at least gives me a direction to not look, lol.

Dave
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