Hi there I have recently purchased a suzuki rm 250 and after buying it realised that the main seals in the engine was shot, as oil was building up in the exhaust. I have stripped the engine down replaced the main seals and all the other seals built it back up with new piston and rings There are times when this bike will start of a few kicks and others when you could kick it 20-30 times and it wont start I have checked if it is water getting into the cylinder and that is okay also the timing is set correctly the exhaust valve was dirty and covered in tar so it has now been thoroughly cleaned, I have also fitted new spark plug and spark plug cap the spark to me looks decent, but have noticed a lack of strength in the magnetism on the flywheel could anybody throw some light on to what the problem could be any help is appreciated Thanks
SOURCE: rm 250 starting issues
This may help you determine the problem.
1. is sprkplug oil fouled? wet? dry? superhot and white electrode?
A sparkplug will always tell you whats going on.
if its too wet then its not burning all the fuel and oil and flooding out.
if its extremely hot and white, then its running lean , and needs more fuel.
also make sure your running 50:1 fuel oil mix.
a hot two stroke is hard to start.
if plug is dry, then its not getting enough fuel.
2. make sure your fuel oil mixture is 50:1.
to much oil is okay but it may smoke alot
way to much oil will oil foul the plug and plug will have oil on it.
to little oil will make the bike run hot and start damaging the bottom end crank bearings as well as your rings , then piston and cylinder walls.
the plug will be whitish and hot.
3. as for the timing , the rotor is resting on a keyway on the crankshaft and will only move out of time if the keyway is sheared.
4. make sure you have good spark when bike wont start.
a coil that is going bad will work cold but may not when it gets warmed up
to sum it up check to make sure you have correct fuel mixture
check you sparkplug to see how its burning
make sure you have good spark
if you have good spark, good fuel, good compression, then it should start within 2 kicks everytime.
i have a blaster 2 stoke 4 wheeler, starts everytimesince i rebuilt it.
i hope this helps you out and you can enjoy the rest of the summer with your dirtbike.
best regards
Big Al
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