Question about 2003 Suzuki RM 250

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1980 Rm 250 wont start and backfires

I have a 1980 rm 250.
I have rebult the moter. parts wiseco poiston .40 over
boysen reedvalves and gaskets.
I have to put gass down the sparke plug and it might start
no idel just bogs out no low end.
and it is spitting gas out the air inlet of the carb.
same reson i hade it bored.
It wont run on the stock timing mark eather it need to be all the way retarded to even run.
was told that would fix it.
what would you think i shuld do next?

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My carb was doing the same thing and i just took it off, took it apart cleaned it out with the air nozle on our compresser and a butter knife to cean out the stuff on the bottom of the bowl, reset the float and it was all good.

Posted on Aug 30, 2009

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In order to solve this you need to start with the very basics, then keep elminating issues until you find the real cause of your problem. Here is the way that I would attack a problem like this:

1. Check to make sure you have all the correct parts and that they are on the stock settings. This would include checking all the jets and float level in the carb, making sure that the bike has the correct CDI box, correct flywheel and stator, and making sure that the bike has the correct spark coil. Check that your spark plug lead is not damaged, and that your spark plug puts out a consistent, fat, blue spark. Is the air filter clean and properly oiled?

2. Once you are sure that the bike is getting air, spark and gas, check the installation that you did on the top end. Did you make sure the arrow on the piston is pointing towards the exhaust? Did both the cylinder base gasket and the head gasket seat properly? Did you do a leak down test to make sure you are not leaking air around your crankcase seals? Are the reeds on the bottom of the cylinder installed correctly, with the gasket, and the reed stops are the correct distance from the base of the reed block?

3. Now that you are sure the bike has the correct amount of air, spark, fuel, and is not leaking air, it will start and run.

I have a 1980 RM250 and had to go through the same process when I bought the bike 3 years ago. The many owners before me installed all sorts of wrong parts, including the wrong carb, the wrong stator, and the wrong reed cage. After going through all of the above, my bike is now a first class vintage race bike. You can check it out at

Hope this helps you. Take your time and I am sure you can solve this.


Joe Nye
AIM: nye206

Posted on Jun 19, 2009

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Sounds like a timing issue then. Recheck your timing to make sure it is correct. It could possibly be a carb issue as you said it will fire up with gas poured in.

Posted on Jun 18, 2009

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