Thanks for the tip Andy, especially about the kitchen floor, HI would be well impressed!
You know, I’ve stripped quite a few engines but have never given a thought to soaking them in fuel to loosen them off. Just never occurred!!! And you’re dead right about fuel in the eyes – very nasty indeed and something to be avoided at all costs.
I’ve normally found that heating with a hot air gun then a small
drop of cellulose thinners through the port and intake will get things moving - it’s quick too but you mustn’t over do the thinners as this will soon take off the all the castor leaving a dry engine. Cellulose won’t shift the baked on crud though but I found tonight that a soak in acetone has done a half reasonable job on the HP’s cylinder head.
Yep - I managed to get it off okay with some help with said heat gun - very easily in fact - to find that the water jacket is
a separate entity that surrounds the liner. The liner itself was a little more difficult but came out okay with a bit more heat but the flywheel was an absolute ‘bugga’ due to a previously damaged/deformed collet and suffered slightly as a result!
Still it’s all apart now and the insides are looking very good indeed. Despite the crud around the exhaust it looks as if this motor had very little running. No evidence of the effects of nitro either. Very beefy crankshaft and some very impressive porting on the cylinder.
The carb came apart okay too but the post has been damaged by over tightening the clamp. The previous owner had ‘whanged’ a 4mm cap head right through the intake to keep the carb on so that will need renovating but apart from that and the collet it should be a straightforward clean and rebuild.
Now I know it’s a bit early in my build but I need some advice on couplings. All those years ago the only coupling that appeared to tolerate the forces involved on my OPS60 was one produced by Rip-Max. It had two bossed discs facing each other with a flat nylon(?) disc about 3mm thick between supported on two posts from each disc. The discs were chromed and the whole thing looked good and worked extremely well.
I have two ‘Huco’ couplings that were with some other bits and pieces with these engines and appear to be a 'variation on a theme'
Question is, are these couplings up to the HP 61 and if not what would others recommend. I’m using a standard straight 2BA shaft.