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Re: Engine loss at throttle [Re: Jalake] #147393 03/23/20 12:53 AM
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FloridaMan Offline
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Good luck and keep us posted. I have a recent thread up you can catch my story but at the end of the day needed to have someone work in the bike a bit professionally. Good news now the bike has more longevity and will be great!

Re: Engine loss at throttle [Re: Jalake] #147399 03/23/20 02:32 PM
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peejman Offline
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Originally Posted by Jalake
A vacuum leak would have to be somewhere between the head and carb correct? Airbox side wouldn't affect much

It does not have this issue every time I run it, and the last time it seemed to clear up after idling for 20 minutes.


Correct.

Idling for 20 minutes? I hope it was cold outside as the bike will get really hot sitting still for that long.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Engine loss at throttle [Re: Jalake] #147411 03/25/20 06:25 PM
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Jalake Offline OP
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Well I have found something!
The small black cover with the small diaphragm inside, the one prone to cracking... It was cracked. When applying slight force and snapped in half completely.

Does anyone know where to source a new one? Partzilla does not have it... Or a part number listed.

Re: Engine loss at throttle [Re: Jalake] #147412 03/25/20 07:27 PM
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peejman Offline
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The cover opposite the choke? That's the coasting enrichment circuit cover.

This one? https://www.rockymountainatvmc.com/parts/mikuni-cv-carburetor-side-cover-p?v=5660


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Engine loss at throttle [Re: peejman] #147414 03/25/20 08:04 PM
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Jalake Offline OP
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Yes that is it! Thank you!

It had a crack and split in half when I removed it

Re: Engine loss at throttle [Re: Jalake] #147415 03/25/20 08:24 PM
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Someone here had reinforced the plastic tube with JB weld on a new part. Seemed like a good idea and might avoid a crack down the road. That part isn't designed very well IMHO.


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Re: Engine loss at throttle [Re: Muniac] #147419 03/25/20 09:03 PM
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Jalake Offline OP
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I found that post, that is what made me think to check that part thoroughly. Well, hoping that and a good carb cleaning/rebuild will sort my issues out.

Side note, does anyone know how many turns out from seated the adjustment screw should be? I've been seeing 3ish but mine was only 1-3/4

Or does it vary bike to bike

Re: Engine loss at throttle [Re: Jalake] #147420 03/25/20 09:12 PM
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Az4x4 Online Content
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Depending on the bike and where its ridden, plus or minus 3 turns is about right for most.


"When it's a life-and-death matter, the market for bullshit drops to zero."
Re: Engine loss at throttle [Re: Jalake] #147421 03/25/20 09:14 PM
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3 turns will provide a bit richer idle and easier starting. That's a good place to begin and has been reported to work for most bikes. The bike is jetted lean from the factory to compensate for a BIG increase in richness as the carb body heats up. It's right behind the cylinder on an air cooled engine. The seat is delicate so when you bottom the adjustment out, do so carefully. Then back it out 3 turns. That's the nominal setting.


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Re: Engine loss at throttle [Re: Jalake] #147434 03/26/20 04:36 PM
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Jalake Offline OP
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I have reassembled the carb, minus the coasting enrichment cover, the float height (I have to measure in 32nd or 64ths as I don't have something to measure mm) the float was set at 12.5/32nd -which roughly translates to 10mm.

I have moved it to to 18.5/32 or 14.5mm

Also the adjustment screw has been set at 3 turns out from seated. Once the new cover comes in I'll put it back in and see how it works.

Is there any kind of priming process? Or just petcock on and crank it?

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