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Author Topic: Mikuni TM32  (Read 2030 times)

Mike_D

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Mikuni TM32
« on: May 23, 2013, 12:03:05 PM »
Well I was going to dink around with my VM34 -- clean it, jet it -- when I thought I'd just go ahead and buy the TM32 flatslide.  I'm hoping to fireball anyway and I'd like something new for the summer so I am going for it.  I found one on Amazon here:

http://www.amazon.com/Mikuni-Flat-Valve-Carb-TM32-1/dp/B000GV7S7Q/ref=sr_1_1?ie=UTF8&qid=1369310225&sr=8-1&keywords=mikuni+tm32

It seems quite cheap -- a good deal, no?  Does it come with everything I need (other than the right jets obviously)?  What jets should I be looking to run in this thing?  I've got a 2003, Iron Barrel, Ace Canister, and plan to put on a gold star exhaust (currently have an Indian exhaust, not the stock one though).  No modifications to the engine as of yet.  I'm at sea level.  Thanks for your help guys, cheers.

dampking

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Re: Mikuni TM32
« Reply #1 on: May 23, 2013, 12:14:32 PM »
133USD for a TM32 sounds pretty good! I think the stock TM32s come with 260 mains and 50 pilot.

I think for 500cc RE you will need the following Jet Specs for TM32

MAIN JET 4/042-Size 190 or 200
PILOT JET VM22/210-Size 27.5 or 30
NEEDLE JET 785-24001-Size (389) Q-2 (Stock, comes with the carb)
JET NEEDLE 5FP17 Clip groove #3 (Stock, comes with the carb)
STARTER JET VM17/1002-Size 60 (Stock, comes with the carb)

By the way, what jets are you using for the VM34. I am also using a VM34 from past 1 year or so and really happy with it! :D

-Sanket

Mike_D

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Re: Mikuni TM32
« Reply #2 on: May 23, 2013, 12:44:01 PM »
Hey Dampking thanks.  I've got a 195 main and a 30 pilot jet in my VM34.  I couldn't see the number on the needle and didn't take it out so unsure about that.

D the D

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Re: Mikuni TM32
« Reply #3 on: May 23, 2013, 04:14:21 PM »
Powersports Superstore is an good dealer with discount pricing.
Sudco has charts that show what jets and needle the carb comes with. Likely you'll need to change them.  http://www.sudco.com/mikuni3.html
Here's the Mikuni tuning guide which explains common stuff like backfires, signs of rich/lean etc.  All stuff you can can read in threads on this board.
http://www.mikuni.com/fs-tuning_guide.html
« Last Edit: May 23, 2013, 04:25:38 PM by D the D »
'07 Iron Barrel Military (Deceased 14 September, 2013)
2014 Yamaha Bolt R Spec V-Twin
1975 XLCH

Chuck D

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Re: Mikuni TM32
« Reply #4 on: May 23, 2013, 04:23:08 PM »
2006 Bullet Sixty-5 w/ Ace "Fireball 535" Kit (#10)
Ace "GP" head in the works.

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Mike_D

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Re: Mikuni TM32
« Reply #5 on: May 23, 2013, 04:46:58 PM »
It was the above thread that got me thinking I'd like to go in this direction.  I'll buy the carb today and hit you all up later when I'm sorting it out.  Thanks!

Guaire

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Re: Mikuni TM32
« Reply #6 on: June 01, 2013, 06:11:12 PM »
I ordered one of the flat slides. I'll be using dampking's jet specs to set up before I run it.
 After 700 miles in two days, I woke up to find the header pipe bracket had broken. My welder will take care of it.
  I'll be cleaning the canister. I hope that clears up my oil problem. One I get to it, I'll post a pic of my 'duckbill'.

ace.cafe

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Re: Mikuni TM32
« Reply #7 on: June 01, 2013, 07:10:52 PM »
Depending on the season and your bike, it will probably need a P6 needle jet, or close to that.
The Q2 that it comes with is way too rich for us.

And you guys need to be remembering that the manifold needs to be one that fits with the TM32 too. The stock manifold is 28mm, and it can't really be bored out to 32mm, or the wall thickness will be paper thin.
If any of you need manifolds, we make an alloy one which is the correct size on the I.D. and the O.D. and it will use a short piece of 1.5" I.D. radiator hose and a pair of band clamps for the connector.
« Last Edit: June 01, 2013, 07:15:31 PM by ace.cafe »
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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Guaire

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Re: Mikuni TM32
« Reply #8 on: June 01, 2013, 11:17:35 PM »
Ace - The current carb is Mikuni VM34mm. I just replaced the manifold from nfield. Will that one fit?

ace.cafe

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Re: Mikuni TM32
« Reply #9 on: June 02, 2013, 02:14:50 AM »
Ace - The current carb is Mikuni VM34mm. I just replaced the manifold from nfield. Will that one fit?

Yes, that one will fit.
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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Guaire

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Re: Mikuni TM32
« Reply #10 on: June 05, 2013, 02:37:30 AM »
The TM32 arrived today. As dampking posted the jets and all were as he listed. I have on order a Main, a Pilot jet and as Ace suggested, a needle jet P6. At least my carb problems will be gone.

D the D

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Re: Mikuni TM32
« Reply #11 on: June 05, 2013, 07:38:43 PM »
Guaire,
After you sort it all out be sure to post your final jetting in the thread "Jetting Redeux" (Redux for the old school) in the Tech Section.  It will make life easier for others down the road.
D
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2014 Yamaha Bolt R Spec V-Twin
1975 XLCH

High On Octane

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Re: Mikuni TM32
« Reply #12 on: June 06, 2013, 12:43:37 PM »
Make sure you also post what altitude you ride at.  Altitude is a huge factor in tuning carbs.  There will be big differences between a proper sea level tuning and a proper tuning for people who live in the mountains like myself.

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Mike_D

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Re: Mikuni TM32
« Reply #13 on: June 08, 2013, 05:53:28 AM »
OK, got the carb in as well as the Goldie exhaust. 

First impressions -- it idles better (had a vm34 in before) and sounds great.  It was a little hard to start though and on my little ride around the block it seemed to be lacking in power and struggled in high rpms.  I had a hard time finding a good jetting start point on the board but went with a P6 needle, 30 pilot and a 190 main.  Needle is in the original position.  I'm at sea level and am using an ace canister.  Engine is stock otherwise...Does this jetting sound OK for a start point?  I'm willing to do plug chops just would like to have the correct jets around before I start.  Any suggestions?  Thanks.

ace.cafe

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Re: Mikuni TM32
« Reply #14 on: June 08, 2013, 11:26:13 AM »
OK, got the carb in as well as the Goldie exhaust. 

First impressions -- it idles better (had a vm34 in before) and sounds great.  It was a little hard to start though and on my little ride around the block it seemed to be lacking in power and struggled in high rpms.  I had a hard time finding a good jetting start point on the board but went with a P6 needle, 30 pilot and a 190 main.  Needle is in the original position.  I'm at sea level and am using an ace canister.  Engine is stock otherwise...Does this jetting sound OK for a start point?  I'm willing to do plug chops just would like to have the correct jets around before I start.  Any suggestions?  Thanks.

It might be useful to try some richer main jets, to see what it likes at the full throttle positions.
Normally, the stock bikes like it richer than a Fireball, because the stock heads don't have the same kind of features to improve atomization, so they tend to need richer jetting because they waste a lot of it. So, I'd have a 195 on hand, and maybe even a 200.
The carb itself is capable to flow about 30% more than that stock head can flow, so it's not holding you back in any way. It just needs tuning. Your jetting is quite close to correct now, and so you're not far off.

Also, don't forget the ignition timing. It will want as much advance as you can give it without pinging. Advance it until it just pings on an uphill grade, or hard acceleration, and then retard it just a hair to avoid the pinging. Then, if it kicks back when starting, retard it just a hair more to avoid kickbacks.
« Last Edit: June 08, 2013, 11:28:51 AM by ace.cafe »
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

Please visit my new website:
http://groups.yahoo.com/neo/groups/AcePerformanceBullets/info