gcoron Posted February 27, 2022 Share Posted February 27, 2022 Has anyone heard of this? I believe I have a broken crankshaft on my Nitro 200. The motor runs but the pulley end does not spin, and I am trying to figure out how to remove the pulley before splitting the case. When I lock the starter wheel end of the crankshaft the pulley end just spins so I am unable to remove the bolt holding the drive pulley on. I have ~280 hrs on this engine Any idea how much a new crankshaft will cost? Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted February 27, 2022 Share Posted February 27, 2022 (edited) That's an odd one... I would think that either the pinion pully (+ broken crank end) would drop out OR the crank would be slamming into the crank case when you spun it up. I cant* see it having two bearing on the output shaft so I am stumped on this one. I am assuming it isn't a clutched output? An impact nut driver would get the nut off, Just grip the pully with you hand (maybe wear gloves) and let the impacts do its work.Take it to a tire repair shop with a packet of chocolate Hobnobs, I would think one of those guys will spin it off for you Edited February 28, 2022 by Blackburn Mark spelling Quote Link to comment Share on other sites More sharing options...
gcoron Posted February 27, 2022 Author Share Posted February 27, 2022 Yes, it is clutched. So I don't think the impact wrench will work, but I'll give it a try. I'm wondering if I can split the case without having to pull the clutch/pulley... Thanks for the ideas. Quote Link to comment Share on other sites More sharing options...
Abaatabit Posted February 28, 2022 Share Posted February 28, 2022 I have just changed the small ribbed crankshaft pulley on mine and it's a tight bugger to get the pulley off I even messaged Laurent in France how to do it as Alex is away at the moment My method was to tighten a bearing seperator onto the middle of the pulley and then attached a two leg gear puller to the bearing seperator and applied a lot of pulling tension I then heated the small pulley with a hot air gun for a good 10 minutes Whilst it was all very hot I then gave the gear puller tension screw bolt head a good tap with a hammer and the pulley pinged off the taper I'm now awaiting a M10 x 1.0mm thread die to tidy up the threads on the crankshaft as the nut hot a bit chewed Hope that helps Mine is an unclutched one - there is a good YouTube video on removing the clutched version Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted February 28, 2022 Share Posted February 28, 2022 8 hours ago, gcoron said: Yes, it is clutched Ah, then the crank isn't broken, your clutch is. The impact gun works against inertia, even a small amount of inertia contained in a clutch bell is plenty The hard part, as Abaatabit suggests, is pulling the bell off.... Quote Link to comment Share on other sites More sharing options...
Abaatabit Posted February 28, 2022 Share Posted February 28, 2022 View this Quote Link to comment Share on other sites More sharing options...
Ville Posted February 28, 2022 Share Posted February 28, 2022 Cranks sometimes break up too. Quote Link to comment Share on other sites More sharing options...
gcoron Posted February 28, 2022 Author Share Posted February 28, 2022 Thanks everyone for the info. So, can anyone tell me where to purchase a new crankshaft and gasket(s), etc? What other things should I do while I have it apart? Bearings, reed valve? Quote Link to comment Share on other sites More sharing options...
gcoron Posted February 28, 2022 Author Share Posted February 28, 2022 1 hour ago, Ville said: Cranks sometimes break up too. ...This is what I think I am working with. I am surprised this would happen on a clutched system with "only" 270 hrs on it. I will post pics when I get in there... Quote Link to comment Share on other sites More sharing options...
Abaatabit Posted February 28, 2022 Share Posted February 28, 2022 49 minutes ago, gcoron said: Thanks everyone for the info. So, can anyone tell me where to purchase a new crankshaft and gasket(s), etc? What other things should I do while I have it apart? Bearings, reed valve? Contact Custom Air Paramotors based in Rayne Essex Alex is UK dealer and sound bloke Quote Link to comment Share on other sites More sharing options...
gcoron Posted March 1, 2022 Author Share Posted March 1, 2022 Yep. This is what I found Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted March 1, 2022 Share Posted March 1, 2022 Owch! I am surprised that ran without chewing on something else expensive! Small mercy Quote Link to comment Share on other sites More sharing options...
gcoron Posted May 10, 2022 Author Share Posted May 10, 2022 Late update: 'Twas indeed broken output end of crankshaft. And it seems I have an older model of the Nitro 200. Ser# stamped on the case is 1022. When I received the new crankshaft (from Eric Dufour of Paratour) I found it was NOT identical to the original: different drive side to fit the 6 arm clutch vs. my original 5 arm clutch, and keyed shaft and magnetic flywheel vs. my unkeyed shft/magnetic flywheel. The flywheel was destroyer during removal and it appears it was epoxied onto the taper (see dark green resin glob in pic). Required a puller and heat from a torch to pop it off Anyway, lessons learned. Quote Link to comment Share on other sites More sharing options...
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