Question about Suzuki RM 250 Motorcycles
Check the carb jets are clean and the tank also ! Using a compression gauge remove the spark plug and fit gauge then kick start it several times and if it reads less than 100 psi then rings etc need checking for damage and wear ! I would check the plug and the resistance on the plug cap and the condition of the coil etc , also i recomend doing the crank seals at the same time as they do go hard after a few years ! Really this is a race engine and should be done every few months ! Make sure that you use 2stroke race oil as well !
A simple engine to rebuild and must be checked constantly because thats how its built , hope this helps and have fun !!
Posted on Apr 22, 2015
When you kick it over you should feel compression, if the compression is there the piston and rings should be alright (or at least not the reason for the no start) To check the plug simply pull it out and smell it, if it wreaks of fuel, its probably fouled out, its pretty common to foul out a plug, and its the best place to start when replacing parts due to it being quite inexpensive. Good luck!
Posted on Apr 22, 2015
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Posted on Jan 02, 2017
Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.
The crank seals could be going bad, but clean the carb first.
Please rate this solution. Thanks asimonton84!
Posted on Apr 02, 2009
Are you loosing transmission gear oil? I seem to remember an older bike I had with a crank seal issue. Gummed up plug is usually only 2 things:
1) Carb too rich. Check jetting or sticky float needle valve that will dump fuel into the intake manifold.
2) Too much oil (check mixture ratio or crank seals that is mixing crankcase oil with the fuel mixture). Either of these two oil issues should produce a massive amount of tailpipe smoking and a noticable drop in power.
Posted on Apr 29, 2009
Does it feel like yhe kick is even engaging and turning the crankshaft? Are you full stroking/kicking it over or short stroking it? when cold, are you using the choke. I suggest taking a compression test when it feels as if it hs no compression It could be undersized piston, rings, or a simple. good luck
Posted on Jun 12, 2009
SOURCE: rm125 power/starting problems
do a leak down test,and compression test,if your cyclinder is damaged you will have to bore it and replace your piston,and if you have an exhaust valve you may need to adjust or replace. check exhaust system could be clogged
Posted on Jul 03, 2009
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