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-   -   PSI Modblasters - XLT - Main Jet Question (https://www.hardcoresledder.com/forums/314-trail-classic-xlt/1857256-psi-modblasters-xlt-main-jet-question.html)

123kielbasa 06-14-2019 08:00 AM

PSI Modblasters - XLT - Main Jet Question
 
Hi guys, posting this for a friend.
He bought a 93 XLT, the sled was equipped with some PSI modblaster pipes. While cleaning the carburetors, I noticed that the main jetting was 220 for Mag and Center, while the PTO end had a 230. Can anybody verify this is correct? I assume that usually the PTO end gets the richest jetting, but have heard conflicting information regarding which cylinder gets the fatter main jet - thanks for any info!

too slow 06-14-2019 11:49 AM

Quote:

Originally Posted by 123kielbasa (Post 20228206)
Hi guys, posting this for a friend.
He bought a 93 XLT, the sled was equipped with some PSI modblaster pipes. While cleaning the carburetors, I noticed that the main jetting was 220 for Mag and Center, while the PTO end had a 230. Can anybody verify this is correct? I assume that usually the PTO end gets the richest jetting, but have heard conflicting information regarding which cylinder gets the fatter main jet - thanks for any info!

Its basically what we ran for aaen pipes in the 93 xlt that had 34 mm carbs. Instead of the 230 on the pto cyl., we ran a 220. Lot depends on the height raised on air intake hood over the hood itself, that leads to the air box opening.
On another note those pipes are friggin loud....hopefully your buddy stays off any private trails with this sled.

cfm 06-14-2019 11:54 AM

richer and fatter mean the same thing.

123kielbasa 06-14-2019 12:45 PM

Quote:

Originally Posted by cfm (Post 20228250)
richer and fatter mean the same thing.

correct, which cylinder gets it?

too slow 06-14-2019 12:57 PM

Quote:

Originally Posted by 123kielbasa (Post 20228258)
correct, which cylinder gets it?

In your case its the pto...clutch side. I had to run a main jet size richer for the pto cyl. on my 95 xcr 600 when it ran triple pipes, seem to be a characteristic of those 600 mono blocks if running triple pipes. The earlier 580 didn't.

123kielbasa 06-14-2019 02:13 PM

but this is a 580.....it's a 1993 XLT..........soooooo which side gets the fatter main?

too slow 06-14-2019 08:13 PM

Quote:

Originally Posted by 123kielbasa (Post 20228270)
but this is a 580.....it's a 1993 XLT..........soooooo which side gets the fatter main?

Whatever side cyl appears to run leaner.

xcr 600 modi 08-25-2019 05:24 PM

There's nothing written in stone about this just base guide line ,,check piston wash and plug color

northstarrick 08-26-2019 07:35 AM

the mono block xlt motor usually needs the pto cylinder richer. this is the hottest cylinder in this motor. furthest from the water pump. it's the ctr, cylinder on ultra's, 800 xcr. but like was said not every motor is the same. piston wash, plug reading, and ex. gas temp should be checked and jetting adjusted on the findings.

racerdave 08-26-2019 09:45 AM

The PTO cylinder also has the most direct shot of air on the airbox


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