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Richard
Richard, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 3020
Experience:  Senior Mechanic & Technician
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250 suzuki: carb looks good..die..better it trys to start

Customer Question

i have a 2004 rmz 250 suzuki i have good compresion good spark and the carb looks good when i kick it over it will start for i revolution then die and the slower i kick it the better it trys to start.
Submitted: 6 years ago.
Category: Motorcycle
Expert:  Richard replied 6 years ago.

RACE TECH :

How are you ?

JACUSTOMER-v1vgxs8k- :

good how are you doing

RACE TECH :

Replace teh sparkplug first, casue you didnt mention it and service the airfilter and make sure the igntion coil cap and wire is good. Has the bike sat for a period of time without being ridden. Lets say 3 or more weeks ? If so your carburetor is gummed up and needs serviced, as well clean the entire fuel system. Fuel tank and flush all lines.

RACE TECH :

I hope you have found my answer helpful. If I have helped you,please click accept. Clicking accept if the only way I am paid. Thanks & Goodluck RaceTech :)

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JACUSTOMER-v1vgxs8k- :

i have done all of that it is not that obvious unfortunatly

RACE TECH :

If you pour a little fuel into the sparkplug hole, reinstall the sparkplug and try and start it, will it start up ?

JACUSTOMER-v1vgxs8k- :

can the cdi box still let spark go through but have the timing off to the point to where it will start for one revolution and thats it

RACE TECH :

Please answer my question.

JACUSTOMER-v1vgxs8k- :

i tried eather and it does the same thing blurps on the first rev and thats it

RACE TECH :

So it does start up right with either buts not without eather ? Please answer my questions.

JACUSTOMER-v1vgxs8k- :

are you still there

JACUSTOMER-v1vgxs8k- :

no it does the same with either as it does without

RACE TECH :

OK,

RACE TECH :

Thank you.

RACE TECH :

do you have a knowm good sparkplug ?

RACE TECH :

Let me look over somethign here

JACUSTOMER-v1vgxs8k- :

yes

RACE TECH :

OK standby ......

JACUSTOMER-v1vgxs8k- :

ok

RACE TECH :

did you remove the sparkplug cap counter clockwise fromthe igntion coil wire and trim teh wire back 1/4 inch or so and then reinstall the cap ?

JACUSTOMER-v1vgxs8k- :

it has good spark solid blue and strong

RACE TECH :

Did you check your compression and valve clearence ?

JACUSTOMER-v1vgxs8k- :

yes compression is strong valves have corect clerance

RACE TECH :

So what are your compression readings ?

RACE TECH :

What are your valve specs ? What did you set them at /

JACUSTOMER-v1vgxs8k- :

150 psi with dcompression disabled

RACE TECH :

Did you remove the fuel ine from the carburetor and turn the petcock to both off and reserve to make sure you have good fuel flow ?

JACUSTOMER-v1vgxs8k- :

yes

RACE TECH :

Last test here and see where we get with it. pour a tablespoon of fuel in the sparkplug hole and now try and start it. Does it start and run for a few seconds or how long ?

RACE TECH :

Did you remove the jet from the carburetor to check it ?

RACE TECH :

Which jet was removed from the carburetor ?

RACE TECH :

Did you completely disassemble the carbruetor, soak it for 1 hour or more and spray each passage with carb cleaner and check each jet and then verify each passage including jets with compressed air ?

JACUSTOMER-v1vgxs8k- :

i sprayed either in the spark plug hole put the plug back in it did the same thing. i totaly went through the carb it looks good i dont remeber what main jet is in it but its not a jetting issue

RACE TECH :

Stop there please. How many jets were removed from the carb ?

JACUSTOMER-v1vgxs8k- :

yes i totaly went through the carb.3 jets

RACE TECH :

Hold on

RACE TECH :

Only thing left is your tps sensor.

RACE TECH :

My best guess is you messed with the sensor when you cleaned the carbruetor.

JACUSTOMER-v1vgxs8k- :

will that keep it from running?

RACE TECH :

Sure will.

JACUSTOMER-v1vgxs8k- :

this problem was here before i cleaned the carb

RACE TECH :

OK, lets get on that subject there

JACUSTOMER-v1vgxs8k- :

k

RACE TECH :

Did it sit for a period of time without being ridden and this is when it happen or were you riding it and it all of a sudden quit ?

JACUSTOMER-v1vgxs8k- :

im not shure its not my bike

JACUSTOMER-v1vgxs8k- :

how about the cdi box?

RACE TECH :

Is it a customers bike or friends bike ? Which one ?

JACUSTOMER-v1vgxs8k- :

customer

RACE TECH :

Did you not ask any of this information ? You need to adjust that sensor to per manul specs.

RACE TECH :

I recommend yo also have a sheet ( questioaire ) for each customer that drops off.

JACUSTOMER-v1vgxs8k- :

yes i do ask questions.this is a rare case for me to be stumped.

RACE TECH :

Your not stumped. adjust the sensor

JACUSTOMER-v1vgxs8k- :

k i will try that.if not that then what?

JACUSTOMER-v1vgxs8k- :

arent they non adjustable?

RACE TECH :

should be adjustable. Look in your service manual for the specs to test it and adjust it

JACUSTOMER-v1vgxs8k- :

ok

RACE TECH :

Thank man.

RACE TECH :

Please click accept if you have been helped.

JACUSTOMER-v1vgxs8k- :

thankyou

RACE TECH :

Surething man.

RACE TECH :

Please click accept if you have been helped.