blaster problem starting PLEASE HELP

[Justintrow]

I have a 95 blaster and recenlty rebuilt top end because i got it not running and the cylander was all torn up so rebuilt that then wasnt getting gas so cleaned carb up now its getting some gas i dont know if enough tho , then the magneto woodruff key broke so we got a new one then now it turns over and starts every so often but will maybe run for like 3 sec then die out any idea on what it wil be? it also back fires alot

 

[harley1-5]

have you leak tested?
new plug?
have you checked reads?

 

[Awk08]

sounds like an ignition/spark, reeds or float level problem ?

check in here for links to checking those .......
http://www.blasterforum.com/engine-13/troubleshooting-maintenance-guide-30347/

 

[harley1-5]

also when cleaning carb and setting float level a qtip is good for cleaning the seat[for the float needle]and make sure to remove the jets for cleanning

 

[Justintrow]

also when cleaning carb and setting float level a qtip is good for cleaning the seat[for the float needle]and make sure to remove the jets for cleanning

i have cleaned it but when the floats are up the needle barley comes out how far should it come? it moves maybe a millimeter

 

[harley1-5]

doesn't move much have you removed it? if not do so and the seat where the needle goes can be cleaned with a qtip with card clean on it and also spray through that passage to make sure its clear.But don't get carb clean on rubber its bad for it

 

[Justintrow]

doesn't move much have you removed it? if not do so and the seat where the needle goes can be cleaned with a qtip with card clean on it and also spray through that passage to make sure its clear.But don't get carb clean on rubber its bad for it

yes ive removed it and cleaned it out real good but when it cliped to the float and move it up and down it hardly moves

 

[harley1-5]

is float set right?

 

[Justintrow]

is float set right?

im pretty sure its getting late here but tomarow ill go out there and take pictures of it and see what you think

 

[harley1-5]

you really should measure float height but an old trick is to turn the carb upside down and both ends of float should be same distance from the carb body but to be safe I would measure it

 

[Justintrow]

you really should measure float height but an old trick is to turn the carb upside down and both ends of float should be same distance from the carb body but to be safe I would measure it

ok ill try that thanks

 

[Blaaster]

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,

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.

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)

 

[Justintrow]

it also backfires alot

 

[Blaaster]

have you leak tested?
new plug?
have you checked reads?

sounds like an ignition/spark, reeds or float level problem ?

check in here for links to checking those .......
http://www.blasterforum.com/engine-13/troubleshooting-maintenance-guide-30347/

Have you done any of above yet?

 

[Justintrow]

put in new plug ,reeds look fine, its getting spark , the float is at about 20mm , i havnt done a leakdown test yet

 

[Blaaster]

Leak test is the next thing to do.

Could it be flooded from trying to start it.

 

[Justintrow]

it been a day since i tryed to start it and did same thinkg today its getting 118 compression

 

[YZX]

It doesn't sound like it's a leak to me. Is it jetted right? New plugs? I had a kx60 that wouldn't start. I cleaned the carb 4 times and then I changed the spark plug and it ran fine.