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Old 07-27-2010, 06:46 PM   #51
Flintrock
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Default Re: #90 Main Jet Drill Size

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Originally Posted by Flintrock View Post
Another word of caution learned the hard way guys:
Jet sizes and their corresponding measurement (drill size, mm or inches) is brand specific.
In other words, a Mikuni 90 is a Kiehin 97.5, or 0.0370 true hole diameter.
Their is no standardization between manufacturers.
Sorry.......
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Old 07-27-2010, 06:51 PM   #52
lbmfpeterson
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Default Re: #90 Main Jet Drill Size

why are you sorry?
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Old 07-27-2010, 06:54 PM   #53
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Default Re: #90 Main Jet Drill Size

Because it aint as easy as a chart with drill sizes on it.......
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Old 07-27-2010, 06:55 PM   #54
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Default Re: #90 Main Jet Drill Size

it is if you are asking for the id of the main jet on an ezgo gas cart! haha
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Old 07-27-2010, 07:03 PM   #55
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Default Re: #90 Main Jet Drill Size

The only way to know that is to find out from EZ go, if they could even tell you. Or as Treestump said, get some pin gauges and start measuring.......
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Old 07-27-2010, 08:41 PM   #56
ez go go
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Default Re: #90 Main Jet Drill Size

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Originally Posted by thewskrs View Post
Thanks for the link on this ez go go. This thing will solve anyones jet size problems. There is a similar thing available for Harley's. This one would probably work for them too.
No problem thewskrs. I love to google b/c there's no tellin what's out there until you start peckin' on that keyboard... I know I worked on my 295/350 jet for a couple of evenings til' I go the jet corrected. I was risking oversizing, but moderation and gauging the bore saved the jet. That being said, I bet this setup could get me better performance and better response without all that studying and work!!!! Glad you liked it!
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Old 08-01-2010, 05:40 PM   #57
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Default Re: #90 Main Jet Drill Size

Wouldn't all this nonsense just go away if someone would find/adapt/build a old style float bowl nut with the adjuster needle in it?

Step 1. Install monster jet
Step 2. Reinstall float bowl, gasket, and adjustable needle.
Step 3. Set screw for initial adjustment of 1 3/4 turns from closed.
Step 4. Run and adjust for any altitude, heat, modifications, fuel type, etc.
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Old 08-01-2010, 08:06 PM   #58
DOOmsman
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Default Re: #90 Main Jet Drill Size

Untill you tweak it to beat the guy next door
and melt a piston
ALA the old sleds with the keinans in your lap.
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Old 08-04-2010, 10:44 PM   #59
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Default Re: #90 Main Jet Drill Size

A question for Treestump......
When you did the head mill, I'm sure you considered the valve timing getting retarded some.
Was the difference negligible or did you compensate somehow?

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Originally Posted by DOOmsman View Post
Untill you tweak it to beat the guy next door
and melt a piston
ALA the old sleds with the keinans in your lap.
I could see that on a 2 stroke; not so much on a 4 stroke though.
If it's leaned out enough to do damage, it probably runs weak too. Not much incentive to leave it that way.
Anyway.... a d/a can do just as much damage playing around with jets as they can with a high speed mixture adjustment. The adjustable just makes it easier.
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