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Hello,
I bought a Steahly 517H which is the +15oz flywheel for a 2004 crf250r. The guy said it came of a fully functioning 2007 crf250r. After putting it on, took it out to the mountains and couldn't get it to start. Had huge paved hill to try bump and it just sounded like a jake brake. No firing at all. Checked/cleaned carb, checked valves and they are in spec. Put new pilot in. Put new plug in. Got one good blue spark on the old plug but that was it. Couldn't get it to spark again. No spark at all with new plug.

Finally put OEM flywheel back on and fired up first kick. I have another 9 oz steahly flywheel that looks very much the same...no removeable magnets that look like they could get bumped off. This weekend I'm going to put the 9 oz on and see if it fires. But it is my sons bike and I'd really like him to have the +15oz. I'm at a loss of ideas because the flywheel is keyed (no damage) and the timing is one for the flywheel and the little gear down on the right side. It is magnetized when touching it on the inside with a screw driver.

Any ideas/suggestions would be much appreciated!

Welcome to the site !!

Did you match up the magnets when looking at the other one and note that they were in the same position in accordance with the keyway ??

I run the Flywheel Weight instead of the flywheel itself , but I know that in order to fire , the timing of the magnets has to be in the same position , (I also used the weight instead of the complete flywheel because it is less cost wise) , but the only thing I can think of is that the magnets are in a different position for some reason , and that is throwing the timing off , and that is why its not starting ...... did you buy direct from Steahly ?? , or thru a dealer ??? , as I am wondering if they gave you the wrong flywheel possibly ?? , but my suggestion is to call Steahly and explain to them the situation and what you did and noted , and give them the part # , so they can make sure it is either the correct part , and/or if they can send a replacement to swap out if it is possibly defective (it happens from time to time) , most reputable companies are willing to do things like that to make sure you are a happy customer (check my post about No-Toil Customer Service) https://www.crfsonly.com/forum/viewtopi ... 41&t=43957 , and that your bike is running/working as it should ......

It sounds like you installed it correctly (used the correct Puller ,made sure the keyway was intact , etc.) , so they should not have a issue working with you to resolve the issue , unfortunately you will have to wait till Monday to call them , but at least you have the stock flywheel (and a 9 oz. ??) for now to get you thru the weekend .... and I agree , a flywheel/flywheel weight , is a major plus for off-road , but match up all (3 ?) of them and make sure the magnets are in the same location in accordance with the keyway , that will tell you if its the correct part at least .... also check for any rub marks on the stator to see if there was any clearance issue , as that will cause issues if its rubbing not only with it working correctly , but also with it damaging your stator , so you want to make sure it is not causing a issue , because if the coating gets wore off the windings and the copper wire becomes bare , it will short out the stator and then you will have another expense replacing that .....

Thanks, good info! The only problem is I have no idea what the magnets look like. There isn't really anything different color on the flywheel - just a ring with a couple bumps. I have another oem i will go compare with though.

As far as flywheel vs a weight - unfortunately weights aren't available for the 04-09 crf250r. I was told there is not enough clearance inside there and that Honda was attempting to make the side to side aspect of the engine skinnier which left no room. Also, the stator goes inside the open end so the weight would block it off.

It is not so much the looks , as it is the placement of the magnets , they ALL should be in the same location with respects to the keyway , that is what you need to match , they all should look the same as the magnet determines when it fires , so it needs to be timed the same as the stock and 9 oz , so look at the inside and see if the locations match .....

As far as the weight goes , it mounts to the outside(the solid area) like this (this is for a 2010-2017 CRF250)

I matched it up to the oem and everything "looks" the same. I'm going to bring it over to Steahly on Monday and see whats up. Also, what brand is that weight? When I talked to the guy at Steahly on the phone he told me they don't make a weight for an 04-09 crf250r but that sure looks like it would fit/work!

That is a Steahly weight for a 10-17 CRF250 , that is why I posted it ,, I can't see that Honda would have widened the ignition cover after 09 , but anything is possible , but the reason I showed it , was for the fact that the issue seems to be a narrower ignition cover , and to me , that wouldn't make a difference if it went around like a ring ,as its not slapped on the end to make it thicker ...... I guess when you call them , ask them why they make the 10-17 weight , but not for the earlier years ..... , and/or why a ring weight like that one wont fit the earlier , I guess would be what you need to ask ...

As far as everything matching ..... That makes the issue that much more puzzling , since there are no physical differences , you would think it would work ...