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  #1  
Old 04-06-2012, 11:19 AM
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Default 1991 RM 250 Dirt Bike starting problem

Hi

I have a RM 250, 1991 and am having troublr starting it. I got it as a christmas present off my mrs which I bought and still havent managed to take it out yet which is realy fustrating as it is just sitting there looking at me.

When I ought the bike it was running but needed slight tweeking. I changed the kill switch and then the problems started. I have had someone look at it and they said the kill switch is fine.

The bike starts with easy start but then struggles to stay started. I have changed the plug which i bought from a bike shop and it is a expensive lithium plug. The bike is producing a spark but it is really faint and that is the reason i have been told it is struggling to stay started and even start from cold.

I am not a mechanic but the chap who had a look at the bike suggested it could possibly be the magneeto ( not sure if this is spelt right).

I am itching to ride the bike but need ome guidence and quick so i can get out on it. As you can probably tell i am a novice at all this and need some help please so any guidence will be very much appreciated.
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Old 04-06-2012, 11:45 AM
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Lithium,,could you mean "iridium"?? one of the things you have to consider when buying anything for 21 year old bike, is why you would want to buy something like a 20 dollar spark plug for something that was on the market before the plug was? think of that in the future.

if you are at all electrical you can test your stator (the assembly that generates the electrical current), and your coil with a $15 tester and a manual giving you the specs. if it is starting on the starting fluid you need to know that:
1. you arent doing it any favors by using that stuff.
2. that you may not be getting a rich enough fuel air mixture.

If you know how to use the choke or enrichening valve and it still doesnt wan to stay running that your low speed circuit is probably plugged up and needs cleaning. set the float while you are there. next is to track down any air leaks, and finally make sure you have adequate compression. setting the float and cleaning the low speed jet and circuit cost literally nothing.
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Old 04-06-2012, 11:53 AM
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Default OK

Ok, the very first thing you need is a service manual for you bike. It helps answer a lot of guestions and will pay for it's self in short order.

1. Weak spark.....Clean the coil contact mounts on the frame, as they rust quickly.
2. Unscrew the sparkplug wire cap at the plug end. Cut 1/4" from the wire and then screw the cap back on the wire.
3. Now check your spark...If good, great...If spark not good then....

( The late 80's and early 90's RM's always had a very big issue with dirt getting into the stator area as the cover just does not seal very well, so..)

4. Pull the stator cover ( magneto ) and check for dirt and dust.
5. Pull the flywheel ( you will need a puller for this. Clean the inside of the flywheel and sand the magnets mounted on it.
(5-A) Use you manual to test the stator wiring.
6. Now check for spark again...If good , great...If no good then disconect the kill switch and check spark again. If good , great...Need a new kill switch.

Now as you stated...The bike has set from at least the holidays so......
Dump the old fuel and drain the carb bowl. Now remove the bowl and remove each jet and clean with a welders tip cleaner, carb cleaner and blow dry.
Be very watchfull of the center orfice in the pilot key as it's very small and if it is not 100% clean you will have starting and running issues.
Now put it all back together and put in fresh fuel mix and start it up.
You should be ready to ride.

Good luck!

Paw Paw
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Old 04-07-2012, 07:30 AM
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Thank you very much for this information. I will get on to it straight away.

Thanks again.

---------- Post added at 06:30 AM ---------- Previous post was at 06:21 AM ----------

Sorry to be a pain but which service manual would you recomend? There is lots on ebay. They are mainly genuine owners service manuals.

Is this the one?
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Old 04-07-2012, 08:26 AM
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Your best bet is a factory "service" manual. Not "owners" manual. The Suzuki manual is going to have the most complete and accurate information.
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Old 04-10-2012, 03:04 PM
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I have both the factory service manual and the clymer. If you choose only one, I would get the clymer. The only thing that the factory manual had that the clymer didn't was the hose and cable routing.
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Old 04-10-2012, 03:20 PM
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hey, the climber manuals i have can double for oldsmobiles and corvairs judging from the pictures.
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Old 04-10-2012, 03:30 PM
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Ha! I know what you mean. I wish someone would get a decent camera and print some glossy color pictures. Better yet, a PDF would be nice. Maybe the newer bikes do but I am too poor to have anything that nice.
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Old 04-10-2012, 04:56 PM
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Thanks guys very much appreciated.
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