schmuckman
Posts: 61
Joined: 12/31/2004 From: Canberra, AUSTRALIA Status: offline
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I used some 10-15 "Break In" with 5% nitro to break the motor in. It ran like crap, but it ensured successful a break in. The temptation was there to switch to a better fuel, but doing this will make sure that the motor is looked after during break in. I ran about 5 tanks through it at low revs and used After Run when finished after each each outing. The 20% would be the nitro content. Blue Thinder is not available where I live, so I use a similar 20% blend and the results are good. The blend I use 68% methyl alcohol, 20% nitro, 12% oil. I took the head shim out, but put it back in as there was no significant increase in performance surprisingly. I took the header off and found a huge welding dag inside and carefully filed this back. I haven't ported it as I don't have the skills, but I would assume a fair bit can be done as the faces don't match that well. Regarding the pipe: I don't see any problems with the standard pipe but I suggest you replace the rubber coupling. Mine broke within 2 hours of use. I also flared the end of the pipe and the header slightly to ensure a tight fit around the rubber coupling. Regarding the props: Octura X440, accelerates badly. Octura X445, quite good. These props are sharpened and balanced and are available from Offshore Electrics The original prop is quite good also. Regarding the plugs: I've run an 8 and an A5 and have seen no real difference. Put some extra floatation in the hull in case you flip it. This includes putting some on the underside of cockpit lid. Mine sank like a stone when it came off once. Hope this helps Brad
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