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Honda TRX Discussions for the Honda TRX, 90, 250, 300, 400, 450, 700

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Old 03-03-2013, 11:01 AM   #1 (permalink)
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carb size

ok well i found out today when i went to put my thumb trottle and stock pipe on today i have a oversized carb dam it well i am getting a stock carb for it and getting rid or the fmf fatty pipe but can anyone tell me how to find out exactley what size my over sized carb is i got a few numbers but cant make any sence out of them the numbers are PJ 27AAAH thanks for any help but i think my power problems where from the fmf gold header with the over sized carb with stock jets i hope making these changes will help my atv run better and more even power band thanks for any and all help also i forgot i think 34 mm is the stock carb size is that correct

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Old 03-03-2013, 02:32 PM   #2 (permalink)
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A quick look on Google at the PJ27AAAH Kehein's tells me this was an probably an upgraded item for this quad. I don't know much about the older Kehein's but this is an oval slide carb and it's pretty desirable amongst the 2 stroke kids. They were popular in 32,34,36 mm sizes in that model # which I know doesn't help you figure out what size it is. Most owners manuals will give the carb size in millimeters in the carb specs. My guess is its a 36mm which seems small as most 250 cc 2 strokes are 38 mm carbs so I don't know whats going on there. I'll get back to later on some jetting specs for this carb, I'll dig around over on Sudco's web site and see what I can find out about what your quad would need maybe. What year is it by the way?
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Old 03-03-2013, 04:41 PM   #3 (permalink)
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It is a 86 250r motor in a 88 atv
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Old 03-03-2013, 05:07 PM   #4 (permalink)
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Alright, I have a few minutes now let me look at the manual and do some digging.
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Old 03-03-2013, 05:14 PM   #5 (permalink)
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Seems the stock size is a 34mm. Need to see what size you have if you think its not the stock carb. You can do this by measuring the engine side opening inside diameter. Also, I found that the PJ series was stock on these motors too. Im downloading the manual for your motor year. What size jets are you running now ?
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Old 03-03-2013, 06:13 PM   #6 (permalink)
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well i did looks at my book for the 86 motor and you are right it is a 34 mm carb but it also shows a round carb the one on it is a oval type carb and also i got a stock thumb throttle with stock cabel and cap also got a new cable and cap for the 86 and both the caps for the 86 are to small to screw on to the top of the carb it had a twist throttle on it when i got it so this is what made me think it was not stock and they had a fmf gold pipe on it with a k@n alumminum open air box on it so i think they where trying to make it faster
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Old 03-03-2013, 07:55 PM   #7 (permalink)
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Hmmm ok, IM a little out of sorts here trying to figure this out. I still think you need to measure your carb cosidering what you have said about the stock caps not fitting this carb.
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Old 03-03-2013, 08:23 PM   #8 (permalink)
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Quote:
Originally Posted by brent View Post
well i did looks at my book for the 86 motor and you are right it is a 34 mm carb but it also shows a round carb the one on it is a oval type carb and also i got a stock thumb throttle with stock cabel and cap also got a new cable and cap for the 86 and both the caps for the 86 are to small to screw on to the top of the carb it had a twist throttle on it when i got it so this is what made me think it was not stock and they had a fmf gold pipe on it with a k@n alumminum open air box on it so i think they where trying to make it faster
Brent, all the 250R's were 34MM stock. I think I gave you jet sizes to start out with in a previous post. As for the size of yours, you'll have to measure the ID of the intake side to determine what size it is. Honda did use a round slide Keihin on 250R's, but that was on the '85 ATC250R, all 86's three and four wheelers were PJ oval slides. And yes, on a machine equipped with a stock carb, the cap and throttle cable are all one piece, and probably won't fit an oversize carb.
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2007 TRX450R
2005 TRX450R
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2003 Lonestar 250R
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1999 CR500
1999 CR250
1996 CR250
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Old 03-03-2013, 08:29 PM   #9 (permalink)
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well i want to go back to stock so i am going to get the oem carb from a 86 a guy i know has but i am trying to find out what i have so i can post the size and i can sell it on ebay i will messure it tomarrow but i am sure it is ovresized due to the fact the caps dont fit if u think i may be wrong let me know the cap would fit if it where a stock carb the guy o know the cap fits that carb
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Old 03-03-2013, 10:08 PM   #10 (permalink)
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Quote:
Originally Posted by brent View Post
well i want to go back to stock so i am going to get the oem carb from a 86 a guy i know has but i am trying to find out what i have so i can post the size and i can sell it on ebay i will messure it tomarrow but i am sure it is ovresized due to the fact the caps dont fit if u think i may be wrong let me know the cap would fit if it where a stock carb the guy o know the cap fits that carb
It could be a 38mm, those would require a larger than stock cap. Possibly a 36mm, but I seem to remember those interchanging with a 34. I could be wrong on this, it's been a while since I've seen a 36.
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2011 CRA Senior II, Buckeye series, and True Grit series Harescramble Champion
2009 CRA Senior II, Buckeye series, True Grit, and Salem MC Harescramble Champ.
2007 CRA Senior II, and Buckeye series Harescramble Champ.


2007 TRX450R
2005 TRX450R
2004 TRX450R
2003 Lonestar 250R
2001 Lonestar 250R.....now a 310
1986 TRX250R (restored to new)
1986 TRX250R (still in pieces)
1999 CR500
1999 CR250
1996 CR250
1986 ATC250R
1975 MR50
1999 Banshee
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