Carburetor replacement

**dieseldogsdad** · 04-15-2010, 06:08 PM

Does your truck have a vacuum advance for timing? If so where did you get vacuum from does the new carb have vac line hookups, I see the tees in the picture but where do they go. I would like to do a similar swap. Did you have to make the adapter for the intake manifold or is it something you can buy?

**Sheperdale** · 04-19-2010, 03:33 PM

I ran all the vacuum lines to include the timing advance back to the port on the intake manifold. Hope that helps.

**Sheperdale** · 07-15-2010, 08:06 PM

Well that's a pretty simplistic approach and I will have to respectfully disagree. When it comes to timing and keeping your vacuum advance, as well as the hiccup with the electrical trying to open and close the the solenoid on the old carb, I would do all the steps that I went through to save the hassle.

**goldstar** · 09-19-2010, 07:59 PM

Great job on the carb swap buddy and thanks for the detailed info and pics.
Your choice to go with Mikuni makes for easy tuning and parts availability and cold weather starting should never be an issue as these are the carbs of choice for most OEM snowmobile manufacturers for both two and four stroke engines. I was considering the same option in case of a carb failure, due to the expense involved in replacing with OEM.
Did the TM you installed have an accelerator pump or does the flat slide of the TM provide enough throttle response to eliminate stumble when accelerating?
Thanks again for sharing your build with the rest of us. I, for one, really appreciate and applaud your efforts.

**Sheperdale** · 09-20-2010, 06:23 PM

I'm just glad that anyone can use it. As for the fuel pump I don't have it but I think it would help. Depending on humidity and temp i have to do small changes. I think the pump would make it more consistent.

**mini me** · 10-28-2010, 12:36 AM

Just wondering if you guys are talking about the same pump ( accelerator pump that are on the carbs themselves ) and the fuel pump sheperdale is talking about. I need and want to do this so bad i hate the stock carb and need to be able to jet the carb because of the air box mod and exhaust mod I have done to my truck

thanks for the wicked post

**goldstar** · 10-28-2010, 07:48 AM

Yeah Mini Me.
The accelerator pump is what we were referring to. What mods did you make to your air box and exhaust?

**mini me** · 10-28-2010, 01:29 PM

For the air box I removed the lid and put a K N filter in it. Punched out the catalytic converter and replaced muffler with a universal glasspack muffler.

Should i be looking for a carb with a accelerator pump to try?
I have one on my Honda trx 450r quad maybe that would work? I forget the specs on it but I will check and see what I got I know on my quad when I removed the air box lid it would die hard if u hit the throttle fast, to fix it i had to change my leak jet to smaller size to make accelerator pump out more fuel

**sdjenk** · 03-30-2011, 05:33 AM

So how is the truck running now with the new carb? I am looking to do the same thing. Could you tell me what motor size you have CC? and which carb is it you used and jet sizes would be helpful. Thanks

**Sheperdale** · 07-17-2011, 07:05 AM

Well the truck with card is still running by what the wife tells me, I have been deployed for a year. It is a 660 and the carb is a mikuni tm 32 flat slide. It's been running great ever since I did it. I found a three position choke cable of a ski doo and ran it into the cab. It's been working great.

**Casper** · 05-25-2012, 08:47 AM

I was wondering how the TM32 did over-all, would you do it again? The carb on my Suzuki Carry is crapping out, I thought about changing to an aircraft carb. However the TM32 is at a decent price and it does look like it fit in just right, as I was going to install a snorkel as well.

**Casper** · 05-25-2012, 10:03 AM

Another question, what would be wrong with using a Mikuni 32mm VM round slide carb instead? It is quite a bit cheaper yet, is it because of top end acceleration "difference between round and flat slide"?

**Casper** · 06-02-2012, 05:12 PM

I just got my Mikuni TM32 and the Mounting flange today. WOW, after removing the old factory stock carb, this is really going to clean things up and make it easier to do maintenance. I started installing the new carb, however I elected to used the spacer off of the old carb to set out the new carb an extra "approx. 1/2" ". This way it will make it just a little easier to work on. I got the fuel line hooked up, the snorkel started, put a good clean cloth "lent free medical towel" over the intake, just to test fire. Started right up, almost idle perfect without adjustment, I think I may have a vacuum line issue "hmm".
One thing that is an issue for me is the throttle cable. I'm going to have one made "as you just can seem to find a cable in that length with the elbow on it". The top of the carb sets pretty close to the bottom of the cab, I wished the carb was an 1" shorter. Anyway I will post some pictures when I get it finally done like I want it.

**Sheperdale** · 06-20-2012, 12:52 PM

Casper,
Sorry about not getting back to you but sounds like you are really on your way. The cable thing got me into manufacturing my own. I did buy a 90 degree tube that screwed into the top of the carb so I didn't have bent housing. It just fit under the beam between the seats. It was actually for a kehin carb but screwed right in. I run mine a little leaner all the time but not so much it runs to hot or backfires.

**Casper** · 06-20-2012, 06:26 PM

Good to hear from you Sheperdale, carb is still a work in progress, one thing that I had to do was change out the 3.3 needle valve "I could figure out why it would puke out some gas from the drain tubes, then it came to me". The TM32 Mikuni is a bike carb first and foremost, hence it was made for gravity feed, I installed a 1.5 needle valve for a fuel pump application and stopped the purging of fuel.
I am currently working with a company out of California to make a throttle cable that will work perfect for the job at hand, when we get it done right I will post it. I told them there will be others that will want to do this "if it all works good".
I got my little rig running but I found other problems "not carb", bad cap and rotor!
Oh, I also installed an aftermarket fuel pump, mine was junk. The new one came with an inline fuel filter that screwed right on the inlet side of the pump. This really cleaned up the frame rail back by the gas tank.

I will try and get some pic's on here when I get some time "really busy now with work".