J D 8 Posted March 24, 2016 Share Posted March 24, 2016 Pic is of the same one as mine,link is of an early Irvine that had a carb body made of a nylon composite material. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 24, 2016 Share Posted March 24, 2016 That looks like a 40 mk3, I think. Quote Link to comment Share on other sites More sharing options...
trebor Posted March 24, 2016 Author Share Posted March 24, 2016 I think the mk 3 had the 28mm od rear bearing in. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 24, 2016 Share Posted March 24, 2016 Mk2 has the small "bumpy" transfer port. Mk3 maybe had both bearings at various points, depending on what was available. If the supply of hybrid bearings dried up then nearest metric would be the obvious thing to go to. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 25, 2016 Share Posted March 25, 2016 Posted by SuperNash on 24/03/2016 10:49:04: E.D. trebor's Irvine will be from the '80s if it is a mk2. Sorry My mistake I picked up on the "53" mentioned in one of the posts and immediately though about the "Red" crankcase models that were later made by OS. E.D. Quote Link to comment Share on other sites More sharing options...
Former Member Posted March 25, 2016 Share Posted March 25, 2016 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
J D 8 Posted March 25, 2016 Share Posted March 25, 2016 My red Irvine 46 ( English made) is very quite running for a two stroke. Quote Link to comment Share on other sites More sharing options...
Former Member Posted March 25, 2016 Share Posted March 25, 2016 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
trebor Posted March 25, 2016 Author Share Posted March 25, 2016 I quite like the noise, I've got the newer type on my old trainer and it's too quiet. When others are in the pits starting their motors up I cannot hear the newer one, I keep thinking I've got dead sticks all the time. Quote Link to comment Share on other sites More sharing options...
Former Member Posted March 25, 2016 Share Posted March 25, 2016 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
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