583 bog until above 1/4 throttle

[joshleakey]

I am stumped, when I got my 98 form. deluxe 583 , it had a bog in the bottom end and i could only get about 120 km out of a full tank while trail riding

since then I have has new plugs gapped (br9es), rave valves cleaned, new stator/ volt. reg., garbs cleaned, belt deflection adjusted
tried it same poblem

so I moved the needle up a clip, same problem

so I dropped 2 jet sizes ( plugs were black)

seemed better in the bottom end when cold but then I rode it for an hr in 0 deg. to + 3 deg. weather, fresh snow on trail, and it once again had a bad bog below 5000 rpm ( 1/4 throttle) (not very convient for cruising!) and took over half a tank to go 50 km on the trails

whats goin on here?

any ideas??

[billww]

How many miles on the sled? have you checked the spark and wires ?

[joshleakey]

just rolled over 10,000 km, compression is 135 in both sides, lots of spark ( when cold at least , I jsut checked when it was flooded lol)

[adamG]

choke or primer? Could the choke be sticking?

[joshleakey]

it has a primer, no choke

[ZX600]

when you cleaned the carbs did you make sure to clean the pilot jets they very commonly gum up and cause a low rpm bog at ligt throttle and sometimes a dead cylinder if totaly blocked off that seems to go away at 1/2 to 3/4 throttle. Its the jet in the base of the carb body that is forward of the main jet closer towards the engine . remove it you should be able to see through it easely if you can't use a small wire or torch tip cleaner push it through. do not force it and open the jet more than it original factory size . or this will cause other concerns for you . tell us how you make out

[joshleakey]

actually I had them cleaned by 2 different shops, and then after that didnt work I had one size smaller new jets put in, I believe it was the pilots that we changed

I was wondering if maby it would be the coils? b/c it runs great for the first 45 mins then after it gets hot it starts acting up?
any thoughts?

[dash]

Clickers on clutch. I think its #3. just to be safe, a quick check on belt to see how high it sits on secondary.any signs of over heating?

[joshleakey]

clickers are on # 3, it sits a few mm above secondary
temp gauge is reading right around the middle of the gauge, so it seems good

[spanky2]

sucking air in somewhere it ain't supposed to??