bradbeer

I bought an old EXT that would not run. I swapped out the carbs and it started up just great there are two slight differences between the book and the carbs:

The Needle is 6DH8 the manual says 6DH8-3
The Needle Jet is a 480 P-3 the manual says 480 P-4

This thing runs good for a short time then bogs out. Could this be the issue?
Are these differences a big deal?
Thanks,
Brad

bradbeer

Hi again!!!
I took my old carbs apart I found a 480 p-2 Needle Jet in it. can someone tell me the difference between the 480 P-2 P-3 and P-4?

should I try the 480 P-2 even though it should have a P-3?

Thanks,
Brad

kccats

Why would you swap the carbs? Just clean the originals!

bradbeer

I had never seen worn out carbs until I got this sled. The valves (plungers) were totally worn. The chrome was non existent. The groves in the needles no longer held the e clips. I got new carbs for cheap off of eBay. Brand new genuine mikunis for $75.00 a piece. In hind site, I should have got a bunch of them.

Brad

kccats

st clean and swap out the jets then.

bradbeer

Thanks.

kccats

Be sure to floss the pilot jet!

bradbeer

Thank
You for your help.

All my jets are new.

Just in case anyone comes across this this thread and is asking the same question:

The needle valve (obviously) affects the amount of fuel to the engine. The higher the number, the richer the air/fuel ratio. Arctic cat says a P3 for my sled in the manual. They recommend a P0 for altitudes above 20,000 feet. I have one on order. I am also looking at ordering new weights and spring for my primary. I'll keep you posted.

Brad