Small Engine Problems? Ask an Engine Mechanic for Answers ASAP
What were the events leading up to this problem? Recent fuel up etc. What do the plugs look like?
brand new plugs when i started it this year it has been doing this
plugs are dark brown on tip
Has the sled been sitting for any length of time
no was stored in garage and had fuel drained before storage has great compression good spark been building sleds for years and this is the first time carb cleaning didnt fix the problem
When you cleaned the carbs did you remove the jets and probe them? Have you inspected the intake and exhaust for critter nests
Any difference with the choke on
yes everything looks good when choke on cant even get it to rev up when its warmed up i cleaned every port in carb and everything looks good
what is starting setting for jet
NEEDLE #3 eclip position 300 main jet40 pilotair screw should be 1.5-2 turns out
It was running fine when parked? Any mods?
thats what everything is set at only mod is breather box not on yet because of bogging problem put it on at first still doing it so took it off to adjust stuff if it bogs should i try leaning out air screw
ran fine last year
At this point you are going to have to rev it to the point it runs poorly and partialy cover the air box to determine weather it is a rich or lean condition.
Thats it. if you modify any part of the intake or exhaust jetting changes must be made. By moding the intake you allowed air to enter with less resistance and changed the mixture.
did that to when you let it bog it keeps running but as soon as i release gas it stalls even with breather box on does the same
It must either run better with the airbox partialy covered or worse.
The plugs are new but are they dry or wet
just did cover box a bit could only get .25 throtle before bog plugs get wet when let bog till stall
That tells us its overfueling. Turn the fuel to the off position and try again, minus the airbox covering. As the bowl begin to empty the problem should clear out
should i turn air screw in quarter turn in at a time until get good rev or is out adding more air
The screws only effect anything under 1/4 throttle
when i turn off gas as bowl emptied it started to rev all the way but fuel emptyed fast and died so how do i stop overfueling
Inspect the float valves. They shut the flow of fuel off.
Think twice before doing that airbox mod
floats move freely even cleaned shaft they ride on needle seats perfect i dont plan on doing airbox mod just off until i get good running so i can get at stuff easy
Valves and seats wear over time. Your best bet is to just replace them both before they become an issue. That is your issue, easy fix, unless you have a float with a hole in it
so you think i should put a new carb kit in it because i bought a new carb kit when i did cleaning and problem still the same
While you have it apart, if you have the kit, it only makes sense to install it
it is all new inside i replaced everything yesterday and i still have same problem i had before put new kit in
Did the kit include a needle and seat?
They usually dont
Are you sure the seats are properly seated? One of your carbs is overfueling, you should be able to tell witch one by the spark plug.
thanks for your time
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