This is my first post so please be gentle with me guys and sorry if i have posted this in the wrong section. Been reading a lot of the posts on here and have to say that you lads certainly know your stuff. I am new to the NSR250 so just trying to educate myself. My first question is this, does anyone know if the MC21 pulse coils (flywheel pick ups) can be used on the MC16? Just from looking at photos it looks like the mounting holes are the same but the sensor looks longer on the MC21. I have seen a pair from a MC11 that look the same apart from the length of the wires and no neutral switch wire i think. I suppose the brackets could be slotted to set the gap. What should the gap be anyway? Is the resistance the same on all models? Any advise/help would be great. Many thanks to anyone who replys, Andy.
The 1987 MC16 and 1988 MC18 run a large flywheel, and the 89~97 models run a small flywheel. As you noted, the mounts are in a similar position on all cases, so you need the correct pick-ups. The reverse side of the mounts are shouldered for location, but I guess you could try to remove the shoulder and then slot them. But really, it would be simpler to just get some more of the correct type. _________________ Andy.
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Thanks for the welcome, yes i agree it would be better but not sure on availability. Think discontinued is looming. I need to check my old ones properly when i get the spec for them to make sure they are the cause of the problem. Cheers Andy.
Think i read somewhere Andy that you stated that the brackets could be slotted to suit? Anyway no matter. Can anyone tell me the resistance spec for the pulse coils?
They can, but it's not ideal (things with slots can, and do move!), and while that short pick-up harness is long discontinued, you can usually find MC16 [or Mk1 MC18] parts on eBay or Yahoo! Auctions these days.
I'd personally rather try get MC16, or adapt '88 MC18, and retain the locating shoulders on the pick-ups wherever possible, given the choice. _________________ Andy.
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Please keep all responses to Forum posts on the Forum so that others may benefit.
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Thanks for the comments Andy, yes i agree it is not ideal. After close inspection there is very little room for the pulsers to move out anyway. Looks like the front cylinder pulser would foul the side casing. Have seen some MC11 ones listed that look the same but obviously they are old and could be flakey. What kind of voltage should i be seeing coming from the pulse coils? I am getting just over 200 ohms resistance but very little voltage. Does the stator generate ignition voltage aswell as AC to the rectifyer or is it done by the flywheel and pulse coils? I am new to the NSR as you can tell!
Thanks once again Andy. Yes i have an old pulse coil and that also read around 200 ohms so i thought it would be long odds that all three were kaput but you never know with old components. No voltage from them though, so obviously the CDI and ignition coils are getting no feed. Just trying to find out if the stator is the culprit or could it still be the pulsers? The flywheel is sending the signal but no juice to send.
O.K. so i got a pair of pulse generators from a MC21 and left the bracket alone. Instead i shortened the pick up sensor to the correct length and double checked this had not altered the resistance, which it hadnt. So swapped the multi plugs over and earthed out the neutral wire. Wired up the coils and checked for spark.....yes....on one cylinder anyway. Swapped the CDIs and the spark swapped cylinders. Luckily i have a couple of spare CDIs so fitted one of them and bingo...two plugs sparking. So it seems that the MC21 pulse generators can be adapted to work with the bigger flywheel while leaving the brackets alone. Pulse generators only cost me £9 so worth a try as i couldnt get any for the MC16. So thanks for your advise Andy.
No problem, i have learned a lot from reading old posts on specialist forums. By posting on here then maybe it might help someone else with similar issues in the future, thats what its all about.
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