I have a 290 main and a 32.5 piloet jet right now.i have the air screw all the way in.the spark plug is a chocolate brown color.last week it was warmer here and it i had the screw a half turn out.its a bout 35f here and my blaster is barely smoking.all I have is oil injector block off kit installed.and air lid removed and tores removed.and a weisco pro light piston bore .20 overi check I have no air leaks I just put all new gaskets.and I don't have any exhaust leaks.
Do I need a bigger jet?
- Thread starter longlive2stroke
- Start date
airscrew all the way in ?
i've never experienced that, even on built/piped engines using the stock carb w/ 32.5 pilot
here:
http://www.blasterforum.com/carburetor-138/adjusting-your-airscrew-pilot-jet-51060/
plug chop to determine main jet:
http://www.blasterforum.com/carburetor-138/how-plug-chop-53237/
while you're in there, check/set floats:
http://www.blasterforum.com/carburetor-138/float-heights-how-adjust-them-50565/
i've never experienced that, even on built/piped engines using the stock carb w/ 32.5 pilot
here:
http://www.blasterforum.com/carburetor-138/adjusting-your-airscrew-pilot-jet-51060/
plug chop to determine main jet:
http://www.blasterforum.com/carburetor-138/how-plug-chop-53237/
while you're in there, check/set floats:
http://www.blasterforum.com/carburetor-138/float-heights-how-adjust-them-50565/
28 - 32 is fine for the plug gap.
You state that you have no air leaks but have you done a leak test, if so what were the results?
Is the oil injection nipple on the carby capped off?
With the mods stated your main jet should be in the vicinity of #260 - #270.
Where is the needle clip?
What pre mix oil are you using and at what ratio?
With the air screw allowing in no air into the idle mix, you must be shipping air from somewhere or the idle screw must be way out of adjustment.
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Idle adjusting.
Set float level.
Start with air screw 1.5 turns out.
Set idle screw so that it has some sort of idle. With TORS it is the big screw under seat on top of unit. With no TORS is is the brass screw midway down carb body.
Warm up motor and then set idle screw for a faster idle, 2000rpm+
Adjust air screw either way to get the fastest idle.
Adjust air screw a little at a time leaving 10 secs or until the motor responds.
Re adjust idle screw for desired idle .
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You state that you have no air leaks but have you done a leak test, if so what were the results?
Is the oil injection nipple on the carby capped off?
With the mods stated your main jet should be in the vicinity of #260 - #270.
Where is the needle clip?
What pre mix oil are you using and at what ratio?
With the air screw allowing in no air into the idle mix, you must be shipping air from somewhere or the idle screw must be way out of adjustment.
---------------------------------------------------------
Idle adjusting.
Set float level.
Start with air screw 1.5 turns out.
Set idle screw so that it has some sort of idle. With TORS it is the big screw under seat on top of unit. With no TORS is is the brass screw midway down carb body.
Warm up motor and then set idle screw for a faster idle, 2000rpm+
Adjust air screw either way to get the fastest idle.
Adjust air screw a little at a time leaving 10 secs or until the motor responds.
Re adjust idle screw for desired idle .
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