Had it running yesterday but would shut off right away. Today won't start. Has good spark, great compression, and it is getting fuel. I spray starting fluid in it and still nothing. When I sprayed it in it yesterday it would start then quickly shut off. I have also tried 2 different carbs.
Blaster won't start
- Thread starter Quadman1
- Start date
if you keep spraying unlubricated starting fluid into it, your next question will be "what piston ?"
have you tried a new plug ?
have you checked the float height and jetting on any of those carbs ?
checked reeds ?
filter, intake, exhaust blockage ?
sudden loss of starting may be spark/plug, reeds, stuck float or flooded bottom end with fuel
The carby may begetting fuel, but is it getting into the crankcase?
Do you have a fuel restriction?
At one point my blaster would only start after kicking it over a million times then it would run like crap. Come to find out there was a reed that was broke in the reed cage but luckly it did not get sucked into the top end.
When you pull the spark plug out is it wet with fuel?
Sometimes an old plug will not fire a fuel charge, but will fire starting fluid.
Sometimes an old plug will not fire a fuel charge, but will fire starting fluid.
That is the most important tool you can have. It will pressurize your engine and detect any air leaks. When a motor has an air leak it make the air/fuel ratio lean. When a motor becomes lean it goes BOOM. Air leaks also cause erratic idle and hard to start. Before diagnosing any problems you should ensure it is leak free and compression is within spec.
is there fuel in it ? petcock turned on ? on reserve if the fuel is low ?
have to ask
i'd suggest you have a stuck float, but the chances of that on 2 different carbs are ????
try tapping the side of the carb with the handle of a screwdriver
have you checked for fuel flow out of the tank to the carb ?
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O I will look into a leak tester. Yes the gas was flowing smoothly into a can when I turned to on. The float was a little messed up but I'm pretty sure I adjusted it right. I think it's ether the tors not being properly removed or serious carb/ intake issue. It has a new top end and a brand new cylinder.
the tors will limit revving, not limit starting
checked the reeds ?
properly check/set float....... (more than pretty sure )
http://www.blasterforum.com/carburetor-138/float-heights-how-adjust-them-50565/
checked the reeds ?
properly check/set float....... (more than pretty sure
)http://www.blasterforum.com/carburetor-138/float-heights-how-adjust-them-50565/
Turn the petcock on and crack open the float bowl drain screw, a constant flow of gas should issue from the drain hose, if not try the following.
Float level should 20 to 21.5mm on a stock carby.
you want to turn the carb and hold it on a slight angle to measure the float height, like shown here......
it should just barely be touching the inner needle, not depressing it,
here's the float height's of the most popular carbs run on our blasters.......Credit to Awk08
26mm vm mikuni - 20-21.5 mm (stock carb)
28mm vm mikuni - 22mm
30mm mikuni - 23-25mm
32/34/36 tm mikuni - 18mm
30mm oko - 19-20MM.
keihin carbs -
alot of these float heights came from this website, if your mikuni or keihin carb isn't listed above, it will be listed here.......
Allens Performance Mikuni & Keihin Carbs (mikuni)
Allens Performance Mikuni & Keihin Carbs (keihin)
It is possible to check the fuel level by attaching a length of clear plastic tubing to the drain nipple , lifting it up the side of the carby, and cracking the drain screw.
The fuel should show in the pipe to the level of the carb body above the float bowl gasket.
Float level should 20 to 21.5mm on a stock carby.
you want to turn the carb and hold it on a slight angle to measure the float height, like shown here......
it should just barely be touching the inner needle, not depressing it,
here's the float height's of the most popular carbs run on our blasters.......Credit to Awk08
26mm vm mikuni - 20-21.5 mm (stock carb)
28mm vm mikuni - 22mm
30mm mikuni - 23-25mm
32/34/36 tm mikuni - 18mm
30mm oko - 19-20MM.
keihin carbs -
alot of these float heights came from this website, if your mikuni or keihin carb isn't listed above, it will be listed here.......
Allens Performance Mikuni & Keihin Carbs (mikuni)
Allens Performance Mikuni & Keihin Carbs (keihin)
It is possible to check the fuel level by attaching a length of clear plastic tubing to the drain nipple , lifting it up the side of the carby, and cracking the drain screw.
The fuel should show in the pipe to the level of the carb body above the float bowl gasket.
Well finally got some time to look at the throttle and well let's just say wow. The previous owner used a brake cable as the throttle cable. Don't ask me how it worked or why he did it because I have the same questions lol. Well I have another cable and I'll swap it over and see.
