Niall Reynolds Posted January 3, 2018 Author Share Posted January 3, 2018 Offending articles Quote Link to comment Share on other sites More sharing options...
Stephen Smith 14 Posted January 3, 2018 Share Posted January 3, 2018 Could try these had loads of motor bike work done by them and there work is second to non, didn't think they would do model engines but list rc planes on there home page. Quote Link to comment Share on other sites More sharing options...
Niall Reynolds Posted January 4, 2018 Author Share Posted January 4, 2018 On a side note guys, I have a Irvine 53 with 3 bolt holes for the head with the threads damaged. Any suggestions on how to approach fixing this. I was thinking helicoils Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted January 4, 2018 Share Posted January 4, 2018 I have some M3 and M4 Helicoils. You would find it cheaper to buy a new crankcase than all the stuff you would need for a repair, but pm me if you want me to have a go at it (no responsibility taken!). Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 5, 2018 Share Posted January 5, 2018 Posted by Niall Reynolds on 04/01/2018 21:56:50: On a side note guys, I have a Irvine 53 with 3 bolt holes for the head with the threads damaged. Any suggestions on how to approach fixing this. I was thinking helicoils Just engines might be the answer Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 5, 2018 Share Posted January 5, 2018 In these cases Cymaz, I usually just tap out .5mm larger Usually on smaller motors, head bolts are 3mm, and you can just go up to 3.5mm I have done repairs for the lads on sliencers, taking those bolts to 4mm. Be careful, and keep everything clean as motor metal is very very soft and requires no heavy handed ops Quote Link to comment Share on other sites More sharing options...
Niall Reynolds Posted January 5, 2018 Author Share Posted January 5, 2018 Might give the tapping out at 3.5 a go and see what happens Quote Link to comment Share on other sites More sharing options...
Manish Chandrayan Posted January 5, 2018 Share Posted January 5, 2018 Posted by Jon Harper - Laser Engines on 03/01/2018 13:43:25: Posted by John Lee on 03/01/2018 11:21:24: I seem to recall from when the problem emerged in the 90's the root cause was that the Japanese authorities banned the hard chroming process on environmental grounds & OS were forced to adopt a less reliable Nikasil plating. The Chinese clone manufacturers were not so restricted & so continued with chrome. Laser used to use chrome but it was possible to wear though it after about 20 years so went to nikasil and have never looked back. The only way to ruin it is if a load of grit gets into the engine. I think OS use a different plating technique though as the colour, finish, and material thickness arent the same as ours. Again though, OS's 4 strokes are fine but i dont know if they do anything to their liners. As a side note, anyone with OS FX series engine should be able to repair them with an ASP piston a liner as the ASP was a clone of the FX. I have never tried it, but i believe it works fine on the 46fx Edited By Jon Harper - Laser Engines on 03/01/2018 13:44:31 On the OS FX - ASP compatibility yes they are a drop in replacement. Similarly the OS 55 carb works great on ASP 52/JBA etc and cures the problems associated with the OEM carb Quote Link to comment Share on other sites More sharing options...
Niall Reynolds Posted January 8, 2018 Author Share Posted January 8, 2018 So johns engine arrived today and the liner and piston are like new. Replaced all and the engine is running like a champ. Thanks again John and the forum, a great place with a great bunch of guys to call on for advice!! Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 8, 2018 Share Posted January 8, 2018 Quote Link to comment Share on other sites More sharing options...
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