Mikuni Swap on a John Deere 400 Snowmobile

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Mikuni Swap on a John Deere 400 Snowmobile

Рет қаралды 3,178

Two Cylinder Will

Күн бұрын

I really came to despise the oem Walbro carb on this sled. So I decided it was time for an upgrade to a Mikuni VM34!

Пікірлер: 22

@400brian Жыл бұрын

I experimented with a Mikuni on a 340/5 15 years ago. I don't remember what needle jet or needle were in it, but I think I found a 25 pilot and a main of 210 or 220 was in the ball park. In the end I put the Walbro back on so I could have the airbox on it. The screaming Mikuni in your lap is not particularly pleasant. A properly functioning Walbro is a great carb. The problem at this point is that they are getting to be 50 years old, often corrosion has taken a toll, and the rebuild kits available now seem to make the carbs very fussy to get set up right. The advantage of the Walbro is the ability to easily adjust the carb to temperature conditions. As you stated, tuning a Mikuni for the early Deere sleds is trial and error, as the specs for the Deere sleds that used them do not work on the early engines.

@tystahl 10 ай бұрын

Where can you get that rebuild kit

@400brian 10 ай бұрын

@@tystahl New Breed Parts or Busco Bullet can probably supply you with whatever kit you want.

@tystahl 10 ай бұрын

@@400brian is there anywhere I can get a new walbro carb

@400brian 10 ай бұрын

@@tystahl These days they show up rarely on ebay. This series carb has been out of production for a long time.

@williamjesse8357 6 ай бұрын

Nice job and great video, best swap you could had done as once the mukkni is set up the sled will run much much better and no more f..king adjusting it all the time

@KevinMn1 Жыл бұрын

Nice job getting it dialed in!

@briandemas2548 Жыл бұрын

You are smart! You know your carb tuning And are a master snowmobile tech. 20 years ago I would have hired you in a heartbeat! man I could have used you.

@GarageWorx Жыл бұрын

Swapping a mikuni into my JD 400 has made it into an awesome running and starting machine.

@jdullemond Жыл бұрын

Awesome video thanks for sharing this with us

@the4thj 6 ай бұрын

We used to throw Walbros in the trash and use a Tilison add the glass ball, best we could find back then. But Mikuni is much better! Yeah, we had to piss with the cock we had too. Can you fix my 2005 Pol RMK 900? I just don't want mess with it the old ones seem easer.

@twocylinderwill 6 ай бұрын

Tilly’s are great carbs once you understand them, I’ve got one on my Ski whiz! They don’t have to have their metering arm set within .001” like the Walbro does.🙄 Also sorry, 2005 is too new for my tastes lol

@noahdale3356 9 ай бұрын

I have the vm34 for my 400 jd what jets and stuff I buy like ur end result

@DarrellD. Жыл бұрын

That sticker has got to be good for at least four or 5 miles an hour.

@tystahl 10 ай бұрын

What did you do with the other line from the gas tank

@twocylinderwill 10 ай бұрын

I pulled it back and cut it so there was about 2” of hose left on the tank. I then plugged it with a bolt and hose clamp to hold it tight

@tystahl 10 ай бұрын

@@twocylinderwill I need to do this but I don’t have the skill, parts, or time to rejet a carb. I have a 1975 John Deere 300 and was wondering if I could get any old carb off of Amazon and just bolt it on

@twocylinderwill 10 ай бұрын

From what I’ve been told, the knock off Mikuni’s aren’t great as they seem to have low quality control. Even to the point where genuine mikuni parts won’t fit in them. The 295cc in that sled might be hard to dial in as there’s not really a good starting point to reference from. You could get a VM30 and start with a pretty standard calibration and go from there as needed

@noahdale3356 Жыл бұрын

Can u send me what I need

@twocylinderwill Жыл бұрын

I can’t, but you can buy a whole kit from newbreedparts.com

@josephbrandt6778 7 ай бұрын

How long did you run it at what rpm to check plug burn and proper color?

@twocylinderwill 7 ай бұрын

Really you should do it at a couple different throttle positions to check all along the carburetor range. 1/4, 1/2, 3/4 and Wide open. I had to cut a lot out of the video but 5 minutes of running at a given throttle position should give you a good read with plug color