[sbkdrew]

What size carbs did the 650's come with before becoming the RXL and what jetting did they have in them?
How do you measure them to determine 36's or 38's anyways?
I presume it's the throat diameter going into the engine, right?
Are they from the same diecast, the 36mm and the 38mm?

Just trying to find the truth from all the different opinions I got at Haydays on what is what.

I'm converting a 95' RXL to carbs and bought a set of carbs and a wire harness from an Indy 650.

Yeah I know an RXL is a big pile of sheit but it's all I got for this year for now. :no_bashing: I went through it last year replacing all the bearings and rebuilding the suspension and the EFI finally crapped on me.
Really don't have the time or desire to part it out and sit in a hayfield in 90 degree heat for a weekend to sell a few parts. :banghead:

Any help or opinions will be appreciated greatly.

 

[n2oiroc]

im pretty sure they were 34's.

 

[racerdave]

38's on both the original early 80's 600, and the 650 that came out in 88

 

[ExcursionPSD]

Originally posted by racerdave@Sep 13 2005, 10:07 PM
38's on both the original early 80's 600, and the 650 that came out in 88
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[/quote]
What he said...

VM38's up to the last one in 1992.

#30 pilot
#260 main
Q-2 needle jet
6-DH7-3 jet needle
2.5 cutaway throttle valve

 

[sbkdrew]

Thanks Ex, just the info I was looking for.
The carbs I bought had 3.0 cutaway valves and 50 pilots in them? :Wow1:
Was told they were out of Indy 650.

I thought the 92' was the first year of the EFI?

 

[AKRAY4PLAY]

'91 was the first RXL and EFI 500, they were limited production though. try a 1.5 or 2.0 cutaway slide and 35 pilots when reconfiguring the carbs. it will run better off idle. i also set my floats about 3/32" lower than stock to clean up the pilot jet curve. the lower float compensates for the angle of the carb when installed. with the slight tilt, the pilot jet is over submerged in fuel.

 

[sbkdrew]

How do you set the floats 3/32" lower, bending the tab on the leaf?
I found it a little odd the way the intake boots I found are angled a little instead of straight.

 

[AKRAY4PLAY]

with the float bowl off, flip it the carb upside down. stock the float arms should be parallel with the carb body. there is a little tab next to the float pivot pin that controls the needle and seat. gently bend that tab down until the float arms are where you want them. the distance the tip of the float arm moves compared to carb body is the measure point. general rule of thumb, the angle of the arms to carb body should be close to the angle of carb body when carbs are installed. about 10 degrees from flat.

 

[sbkdrew]

Originally posted by AKRAY4PLAY@Sep 19 2005, 02:24 PM
with the float bowl off, flip it the carb upside down. stock the float arms should be parallel with the carb body. there is a little tab next to the float pivot pin that controls the needle and seat. gently bend that tab down until the float arms are where you want them. the distance the tip of the float arm moves compared to carb body is the measure point. general rule of thumb, the angle of the arms to carb body should be close to the angle of carb body when carbs are installed. about 10 degrees from flat.
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[/quote]

Got it!

So for clarification, with the carb upside down and looking at it from the side, should the float arms bend up or down?
10 degrees as you mentioned in your PM.

 

[AKRAY4PLAY]

the arms should be up at the tips.

 

[racerdave]

like this

 

[XCR1250]

Wrong about the first RXL, 1990 was the first, how be it, it was the 01 engine, in 1991 the 02 was introduced, and was used for the RXL and carbed 650's till the end of the 650. The jetting was different in different years, so if you need to know what jetting was stock, write me back at, [email protected] I can give you any info on any Polaris ever built. 38 mm aluminum carbs were used on all the 650's regardless of the year, the EFI throttle body was 46 mm, however the butterrfly lowered the mm size by approx. 2 mm.