Blades still turning at idle speed???

[Made2Fade]

Hi all, any help here would be appreciated. Problem is on my raptor 50. When the engine is at idling speed my main blades still turn ever so slowly. Am i right in thinking that this is a clutch problem? Either a broken clutch or something to do with the starting system. I could have sworn the clutch looked fine though as i recently installed an os 50 hyper and mp2 so had to fit it to the new engine. Im thinking something to do with the starting system as i can hear a weird buzzing vibration coming from the starting coupler. It sounds a bit like a washer on something vibrating very fast. Is the starting coupler supposed to turn after you have started the engine? Mine does... also if you hold the coupler when the engine is idling the buzzing vibration sound goes away. Will this have anything to do with my blades moving at idle? or could there be something wrong with both my clutch and starting system (possibly the bearings in there)?
Thanks in advance.
Lee

[Bender]

Its possible that your clutch has developed a set and are not returning to the unloaded position, to check, measure the two slits in the clutch, the slit should be paralell along its length. if the gap is wider towards the outer edge, this would be the problem and it would need replacing (bending back wont work)
Or Maybe it could be a bit of liner has bulged and is grabbing.
the noisy start shaft is I believe an unrelated problem, do they spin when running?, yes mine does, but is stopped with light finger pressure
If its very noisy or vibrating a lot, , check the startshaft/clutch bell bearings, as well as the shaft itself and the hex adaptor. Lube/replace the bearings, and check the shaft is straight and the hex adaptor is secure and tight
well thats what Id look at first

[Made2Fade]

Thanks for that Bender... very helpful of you. I am going to check my clutch now and see if your right. I think im gonna replace the clutch with a heavy duty one from quick u.k anyways so hopefully that will sort that problem out. As far as the starting systems concerned i will probably just do the same and change out the shaft and bearings anyway. How long does a clutch normally last for? A starting section is something i would have thought doesnt really get damaged in a regular crash but obviously its something i just didnt think about.
Cheers
Lee

[chappers]

is the tickover slow enough for clutch to drop out? is it a new clutch/model? has the model been ok in the past and just developed the problem?

[Made2Fade]

Answering your questions Chappers... No the model isnt new and the clutch is the original one that i got with the heli. As far as im aware one minute it was ok then when i replaced the engine in the model to an os50 hyper it started then. Same with the buzzing vibration coming from the starting coupler area. I can set the tickover as slow as i can get it without the engine stopping and they will still move slowly.
Thanks,
Lee

[chappers]

yeah sorry looks like your gonna have to pull it apart and have a look!

[Raptorite]

Hi Made2Fade,

I have heard of this sort of thing before, my guess would be that when the start shaft was installed the little thrust washer that sits above the E circlip on the bottom of the shaft has been left out. If the builder previously built a 30 version this is highly likely as the 30 doesnt have a thrust washer.

You might be able to tell by taking the engine out and having a look up inside the clutch bell, you should see the E clip on the end of the start shaft up against the bearing in the centre of the bell, where the split is in the E clip you should see a washer, if all you can see is the bearing then chances are its missing.

The vibration you are getting is most likely caused by the excess movement in the start shaft, and yes they can and do spin the start cup when the engine is running.

I hope this helps.

Cheers,

Pete.

[Made2Fade]

Pete i will look at that when i install my new heavy duty clutch. Thanks for that.
Lee