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Post by robertson83 on Aug 8, 2019 22:46:02 GMT 1
Hi guys, after fitting flywheel back on the ypvs today I noticed a clicking sound coming from the crankcase while turning it over by hand, really not sure what it is, everything is turning smoothly like it should. would a half moon clip slip around if worn? that's what it sounds like or a bearing peg but i'm sure there would be movement from a bearing peg
Any suggestions? cheers
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Post by oldbritguy on Aug 8, 2019 23:54:14 GMT 1
Half moon clip should not move at all with the engine turning, certainly if only turned by hand, as it is fitted to the outer race of the main bearing which will not turn unless the cases are badly worn and the bearing is spinning. This would make a bit more noise than a "click"
Is the rotor on tight and correctly fitted onto the woodruff key?
Have you rebuilt the motor recently and maybe dropped something small and metallic into the crankcase?
If cylinders are fitted you may get a click from worn piston rings in the piston grooves at TDC and BDC?
Need more info I think
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Post by robertson83 on Aug 9, 2019 0:45:30 GMT 1
The rotor is on correctly, I have recently rebuilt the engine with new crank and using wosner pistons so all new stuff, the noise is at BDC when the flywheel is turned clockwise, but not a full stroke just a flick, I know this is the wrong rotation but its very noticeable when turned like this, it does do it as well when turned in the correct rotation but its not as loud. I used a screwdriver to have a listen around the engine and its coming from the crankcase
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Post by dusty350 on Aug 9, 2019 7:09:03 GMT 1
If it was mine, and it definitely sounded internal, then it would have to come apart again I'm afraid  Dusty |
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Post by midlifecrisisrd on Aug 9, 2019 8:56:48 GMT 1
Pull the rotor and primary off first then see how it sounds
Steve
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Post by robertson83 on Aug 9, 2019 9:28:22 GMT 1
Sorted. was the bloody reeds ticking, never heard anything so loud before, resonating all over the engine, been a long week chaps
cheers
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Post by Yogi on Aug 9, 2019 9:35:13 GMT 1
Are you running k-n type air filters with the metal backs because they’ve been known to cause resonance
Matt
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Post by oldbritguy on Aug 9, 2019 16:59:12 GMT 1
Sorted. was the bloody reeds ticking, never heard anything so loud before, resonating all over the engine, been a long week chaps cheers Great news  Nothing worse than hearing something not quite right after a rebuild. Panic over. How about sharing some pics of the rebuild with the forum? John |
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Post by robertson83 on Aug 9, 2019 19:13:54 GMT 1
I will get some photos on soon, am running open carbs. should say its a race bike yamagamma so not strictly Yamaha rd but I am a fan of all things 2 stroke and very grateful of everyones help
cheers, Matt
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Post by veg on Aug 9, 2019 19:22:26 GMT 1
It has the heart of a yam that’s good enough 👍
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Post by robertson83 on Aug 10, 2019 21:29:45 GMT 1
Haha. the most important part, so dyno today at Dave Reynolds in Cradley heath 68hp. happy bunny
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Post by oldbritguy on Aug 10, 2019 22:15:03 GMT 1
Nice one.
You will be well pleased with that.
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Post by dazzer on Aug 10, 2019 22:37:37 GMT 1
Nice one. You will be well pleased with that. hi ,dont know if any one could help with any advice, rd 350 f2 fitted a new stator, was ordered for right model,new stator looked the same but had no screw holes in back to screw black wire in to so, drilled hole in back side of stator cut a thread
and fitted wire on ,fitted all other wires to right colours on loom,tried to start bike but would not fire up,took black wire off stator,fired up missfire with backfire then cut out ,earthed wire to frame with no difference not sure where it went wrong but have no idea what to do next,fitted new stator due to lights only working off battery but engine ran fine |
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Post by oldbritguy on Aug 10, 2019 22:48:02 GMT 1
Nice one. You will be well pleased with that. hi ,dont know if any one could help with any advice, rd 350 f2 fitted a new stator, was ordered for right model,new stator looked the same but had no screw holes in back to screw black wire in to so, drilled hole in back side of stator cut a thread
and fitted wire on ,fitted all other wires to right colours on loom,tried to start bike but would not fire up,took black wire off stator,fired up missfire with backfire then cut out ,earthed wire to frame with no difference not sure where it went wrong but have no idea what to do next,fitted new stator due to lights only working off battery but engine ran fine Hi Dazzer Welcome to the forum mate. You have asked this question in a separate thread which is fine but it will be missed by many of the more knowledgable members on the forum. Start a separate thread with this and I am sure you will get a number of good responses from the troops John |
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