Just disassembled my hobbit top end to find this. Tell me why my piston looks like this please...and what to do about it. Was originally taking apart to apply spray gasket sealer to my gaskets to eliminate air leaks, then I find this..
Thanks guys
Tell me about my piston please...
Re: Tell me about my piston please...
You mean the black carbon buildup?
Re: Tell me about my piston please...
Yup. Basically a brand new kit, less than like 10 actual miles on it, the bike isn’t even tunes yet. Just feel like that’s an abnormal amount no?
Re: Tell me about my piston please...
To cold Plug, Way rich, To much/ Wrong oil?
Re: Tell me about my piston please...
Ahh yes the plug. When I purchased the kit I got a new plug to go with it-without thinking bought the plug for the stock cylinder. Have been assuming it’d be alright for tuning... Thanks for narrowing that down for me
Re: Tell me about my piston please...
Generally a stock plug will be hotter not colder. That's rich and possibly crappy oil. What are you running? Has good transfer flow though.
Re: Tell me about my piston please...
Red line at 50:1
Re: Tell me about my piston please...
Iv'e heard stories about RedLine not burning well in low performance applications? si it is an oil formulated for racing (maximum protection, with frequent rebuilding in mind)
And you may be jetted too rich as well. How does it run, and what does the plug look like? It does look like alot for 10 miles
Re: Tell me about my piston please...
Run a bp6hs spark plug
Re: Tell me about my piston please...
Redline sucks!
Re: Tell me about my piston please...
if the Plug is way to cold you might get to much carbon build up, but with the stock Plug it's probably running hot, so that wouldn't be the problem.
Re: Tell me about my piston please...
Looks to me like you are running much richer than 50:1 and hot at that. The cylinder flow is good, but your temps/mix are bad
Re: Tell me about my piston please...
50 to 1 is 2.56 ounces of 2 stroke oil to a gallon of gas, (128 oz)
Timed the motor. I need to see the plug and Red Line is rated one of the top 2 stroke oils. By the people that know something and are very knowledgeable.
Re: Tell me about my piston please...
it is cool to see the nice cylinder wash patterns where the frsh mix is rolling thru the transfers.
What's your pipe? it may also jus not be breathing enough out.
Re: Tell me about my piston please...
Looks like it’s running pretty rich in the oil department
Re: Tell me about my piston please...
It’s a proma circuit pipe. Dr cylinder. Vm20, which could in fact be jetted improperly....? Just running the main jet it came with then plopped in a 17.5 idle jet. No amount of tuning I do to the carb affects the running of the bike though, hence me wanting to eliminate any air leaks
Re: Tell me about my piston please...
Its not bad. I would question oil type and amount if anything.
Re: Tell me about my piston please...
If you run Marvel Mystery Oil once a month with your two stroke you will find no residue on your piston
Re: Tell me about my piston please...
Air leaks.....tell me more?!? What type of spay gasket maker you trying to use?
I would cut a new gasket and soak it in oil before I sprayed anything on it.
Re: Tell me about my piston please...
Also, adjusted t2 oil ratios will affect fuel ratio too.
If you remove oil there is more gas (richer). You may need to re jet or at least check.
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