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How did the plug look?
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Is this the same photograph taken weeks ago that the base gasket was gone? just wondering.Mike4130 said:Here is what my piston looked like after 2 months (And no more than 6 hours at the most total run time) running Klotz synthetic oil. I also have a bent crankshaft as a result I believe. If you'll notice the the top of the piston where there is no build up, I 'm thinking there was zero or even (-)squish causing the force of the piston hitting to bend the crank. Either way, the piston & cylinder were a mess and the motor never ran right. I dropped in a new motor with a 990 carb and I'm up & running. (Without the Klotz...)
Yes. It is.alfred e numan said:Is this the same photograph taken weeks ago that the base gasket was gone? just wondering.
A little burnt, the carb was running lean. I've since replaced it with a 990. I'm sure it was a combination of problems that caused my motor issues.RCDAD said:How did the plug look?
Oh yea, I have seen in the past heavy carbon make hot spots on pistons, cause then to seize up. Another thing that could have happened- if it got lean with all that build up - when it starts coming off - it just hammers parts- good chance this is what happened.- There is quite a large squish clearence on the stock hy engines, soo its doubhtful there was actually any bindind at top dead center as it was running.alfred e numan said:Yea, thats a very rich looking build up - so black. The areas with no carbon are as clean as a part thats never been ran, no tell tale signs of getting hot in those areas either- nothing baked on.- weird.
A burnt plug will be white or grey from ash. If it was black and full of carbon like the piston, that is caused by running too rich.Mike4130 said:A little burnt, the carb was running lean. I've since replaced it with a 990. I'm sure it was a combination of problems that caused my motor issues.
Thanks for your input!alfred e numan said:Here is the top end- go to daves discount motors- DDM, enter this- CA-486.-- $49.00. Its a way to have a good basher motor on a beer budget!!
I am still 1/2 asleep-lol. Use these bolts on the jug on the engine, no washers, no locktite.-- HPI part # 15438. Wide Cap Head Torx Screw. M5 x 20 MM. You will need a T-27 Wrench tighten. # 15438 contains 4 bolts.alfred e numan said:I have one of these displacement mills on the bench, a few gallons ran tru it. My secret -not everyone agrees, is to buy the graphite coated stainless steel base gasket from DDM, buy 3 or 4 and use the one with the best coating on it. start the engine enough to come up to temp, cool, retorque, do this 2 or 3 times. I use the standard paper gasket on the center cases. This sealed my top-end. others have not had the same results-
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