#90 Main Jet Drill Size

thewskrs · 07-25-2010, 12:58 PM

I just reread the thread, at least the parts actually about the jet size, and I saw where you guessed the #65 drill would do it. Right on the money! Good going. Just shows that shade tree stuff works every day.! Good luck on the float. That may be harder to solve!

ez go go · 07-25-2010, 01:48 PM

Back to work!!! Treestump, I found this and thought you might be interested in it.. Take a look and see... It says it will fit any float bowl carb. and names several... I did a little reading on it but there was a lot more info. that I didn't.... http://www.thunderproducts.com/dial_a_jet.htm

Also, since you seem to be handy with some good ideas, what about finding a brass float that could be altered using a little solder??? Just thinkin if it was similar in size and would clear all the internal components why not. This way you could alter the level tab as needed to achieve what your lookin for...

lbmfpeterson · 07-26-2010, 03:05 PM

thats pretty cool!

ez go go · 07-26-2010, 08:30 PM

Aint it? Thought it might be an option on a mod. stock engine to help dial in the fuel flow if compression ratios changed!!

lbmfpeterson · 07-27-2010, 11:31 AM

It would be perfect for a stroker ezgo motor build!!!!!!! I have killed quite a few jets going from drill bit to drill bit!

ez go go · 07-27-2010, 03:41 PM

I had never seen anything like it... I google an adjustable carb float for treestump and this result came up in the search so I clicked on it out of curiosity and come to find out it was an option for small engine builds that used a float bowl.... I bet that guy is makin some serious money!!

gornoman · 07-27-2010, 04:05 PM

This thread was more fun 2 pages ago.

Nice job of hanging in there, ez go go! And it's good to see the OP got his answer after all was said and done. Carry on!

DOOmsman · 07-27-2010, 04:52 PM

\ /
l l
l l
If you jet opening looks like this with a taper
on the inlet, try and duplicate it after boring
a large hole, it makes a big difference in the flow rate.

thewskrs · 07-27-2010, 06:11 PM

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.

Flintrock · 07-27-2010, 06:41 PM

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.

07-25-2010, 12:58 PM	#41
thewskrs Gone Wild Join Date: Apr 2010 Location: Malakoff, TX Posts: 381	Re: #90 Main Jet Drill Size I just reread the thread, at least the parts actually about the jet size, and I saw where you guessed the #65 drill would do it. Right on the money! Good going. Just shows that shade tree stuff works every day.! Good luck on the float. That may be harder to solve!

07-25-2010, 01:48 PM	#42
ez go go Doin' the Wild Thang Join Date: Mar 2010 Location: Greenville, AL Posts: 1,063	Re: #90 Main Jet Drill Size Back to work!!! Treestump, I found this and thought you might be interested in it.. Take a look and see... It says it will fit any float bowl carb. and names several... I did a little reading on it but there was a lot more info. that I didn't.... http://www.thunderproducts.com/dial_a_jet.htm Also, since you seem to be handy with some good ideas, what about finding a brass float that could be altered using a little solder??? Just thinkin if it was similar in size and would clear all the internal components why not. This way you could alter the level tab as needed to achieve what your lookin for...

07-26-2010, 03:05 PM	#43
lbmfpeterson Gone Wild Join Date: Jul 2010 Location: Chanlder AZ Posts: 201	Re: #90 Main Jet Drill Size thats pretty cool!

07-26-2010, 08:30 PM	#44
ez go go Doin' the Wild Thang Join Date: Mar 2010 Location: Greenville, AL Posts: 1,063	Re: #90 Main Jet Drill Size Aint it? Thought it might be an option on a mod. stock engine to help dial in the fuel flow if compression ratios changed!!

07-27-2010, 11:31 AM	#45
lbmfpeterson Gone Wild Join Date: Jul 2010 Location: Chanlder AZ Posts: 201	Re: #90 Main Jet Drill Size It would be perfect for a stroker ezgo motor build!!!!!!! I have killed quite a few jets going from drill bit to drill bit!

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07-27-2010, 03:41 PM	#46
ez go go Doin' the Wild Thang Join Date: Mar 2010 Location: Greenville, AL Posts: 1,063	Re: #90 Main Jet Drill Size I had never seen anything like it... I google an adjustable carb float for treestump and this result came up in the search so I clicked on it out of curiosity and come to find out it was an option for small engine builds that used a float bowl.... I bet that guy is makin some serious money!!

07-27-2010, 04:05 PM	#47
gornoman Stay thirsty my friends! Join Date: Jan 2007 Location: Suburban Chicago Posts: 24,291	Re: #90 Main Jet Drill Size This thread was more fun 2 pages ago. Nice job of hanging in there, ez go go! And it's good to see the OP got his answer after all was said and done. Carry on!

07-27-2010, 04:52 PM	#48
DOOmsman Gone Wild Join Date: Jul 2008 Location: Reddick IL Posts: 11,220	Re: #90 Main Jet Drill Size \ / l l l l If you jet opening looks like this with a taper on the inlet, try and duplicate it after boring a large hole, it makes a big difference in the flow rate.

07-27-2010, 06:11 PM	#49
thewskrs Gone Wild Join Date: Apr 2010 Location: Malakoff, TX Posts: 381	Re: #90 Main Jet Drill Size 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.

07-27-2010, 06:41 PM	#50
Flintrock Raised by coyotes Join Date: Nov 2008 Location: Central Texas Posts: 5,658	Re: #90 Main Jet Drill Size 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.

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