tommcb6016 Posted October 12, 2013 Share Posted October 12, 2013 This episode in my flying life starts last Saturday, when my very nice flight was interrupted by a very inconvenient crack in my cylinder head (not that I knew that at the time..) Ah well S**t happens. I was very kindly offered a replacement and duly excepted (thanks again Stu) Life is good again.. Well it doesn't end there.. Today I fitted the new head, with some new gaskets from Parajet and all seemed great! the engine ran like a dream. Anyway I will get to the point.. I went for a flight this evening as the forecast rain has been put back by a day, after 10 minutes BANG and I'm gliding, executed a reasonable forced landing in the middle of a sheep field, carried my kit to a barn and met the farmer who didn't seem all that fussed about my unexpected appearance on his land and he pointed me in the direction of the road where my wife rescued me and delivered me back to my field Any way after stripping my engine down.. I have discovered a blown piston ring and destroyed cylinder, it all seems due to me putting the piston in the wrong way so the rings were running over the exhaust port! school boy error.. The new head appears to be fine Live and learn, expensive mistakes just make you learn faster! Quote Link to comment Share on other sites More sharing options...
spigot Posted October 12, 2013 Share Posted October 12, 2013 Errrrr, why remove the piston? Sent from my iPhone using PMC Forum mobile app Quote Link to comment Share on other sites More sharing options...
spigot Posted October 12, 2013 Share Posted October 12, 2013 Piaggio typhoon 172 kit on eBay for £260 ish I know the malossi piston is the same You will have to check with the seller to see if cylinder numbers match up. Sent from my iPhone using PMC Forum mobile app Quote Link to comment Share on other sites More sharing options...
tommcb6016 Posted October 13, 2013 Author Share Posted October 13, 2013 Errrrr, why remove the piston? I keep asking myself the same thing... Thought I'd decoke the piston and check the rings, wish I hadn't bothered now! Sent from my iPad using PMC Forum mobile app Quote Link to comment Share on other sites More sharing options...
tommcb6016 Posted October 13, 2013 Author Share Posted October 13, 2013 http://www.pmtuning.co.uk/malossi-alumi ... air-cooled Not sure if this is the correct one Sent from my iPad using PMC Forum mobile app Quote Link to comment Share on other sites More sharing options...
spigot Posted October 13, 2013 Share Posted October 13, 2013 That's the one. I would ask pm tuning to check your old cylinder against the new one. I very much doubt Parajet or corsair machine them to fit their crank cases, but they might Sent from my iPhone using PMC Forum mobile app Quote Link to comment Share on other sites More sharing options...
tommcb6016 Posted October 13, 2013 Author Share Posted October 13, 2013 I found the missing part of the ring, it was all in the exhaust.. Checked crankcase and it's clean as a whistle.. luckily! at least I don't need to replace the bearings too. Quote Link to comment Share on other sites More sharing options...
tommcb6016 Posted October 17, 2013 Author Share Posted October 17, 2013 New cylinder kit arrived today from Parajet as usual awesome service from them, They had to modify the Malossi kit for me to replace the Parmakit Hopefully I will put it back together properly now.... can't afford another one next week! Quote Link to comment Share on other sites More sharing options...
ptwizz Posted October 18, 2013 Share Posted October 18, 2013 http://www.pmtuning.co.uk/malossi-aluminium-mhr-172cc-cylinder-kit-piaggio-125cc-150cc-air-cooledNot sure if this is the correct one Sent from my iPad using PMC Forum mobile app Really? This is an aftermarket big bore kit, the like of which marked the demise of most of the small 2 stroke bikes owned by my friends in the 70s and 80s. Is this suggested as an alternative, or is this what is supplied as part of the original paramotor? Quote Link to comment Share on other sites More sharing options...
tommcb6016 Posted October 18, 2013 Author Share Posted October 18, 2013 Mine was originally a Parmakit head but I believe they moved to Malossi and this is standard fit. Quote Link to comment Share on other sites More sharing options...
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