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Sep 26, 2021, 12:29 PM
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Discussion

K&b .18


Hi all. Looking for some help with a K&B .18 that I stuck in a Miss Vegas. Got the motor broke in and running fine. Went out the other day and started leaning it out a bit as it was running rich, or so I believe. Now everytime I make a run I end up with fuel and looks like a little oil in the bottom of the boat. Thought the fuel tank was leaking at first under full throttle but now I'm pretty sure it's coming out of the carb under throttle.
I was hoping somebody had some thoughts or suggestions.
Thanks
Russ
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Oct 04, 2021, 04:25 PM
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Still looking for advice.
Oct 04, 2021, 05:01 PM
RC boat Rock Star
It could be an exhaust or bearing leak.
Oct 05, 2021, 03:27 PM
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Thanks Ron. I'll start there.
Oct 05, 2021, 05:39 PM
GloBroz PowerLab
1QwkSport2.5r's Avatar
If the mixture is super rich, the carb will spit fuel due to reversion at the rotary valve. The exhaust can leak where the muffler or header mates to the engine - I use RTV silicone at this joint to prevent leaks. The front bearing shouldn’t leak much oil out unless the mixture is super rich or the crankcase to crankshaft fit is loose (which is where the crankcase seal is actually made; not at the front bearing itself!).
Oct 05, 2021, 09:57 PM
RC boat Rock Star
The K&B .18 wasn't much of an improvement over the stock engine which was made by O.S Engines. Now, Nova Rossi has/had one that would be a killer in that boat and it was a pull-start engine also.
Oct 06, 2021, 02:09 PM
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It appears to be the exhaust gasket. So what do you guys do for this gasket? Cardboard, wet or dry or just some gasket sealer? I would love a Novi Rossi motor but since gaskets are cheaper I'll be sticking with this!
Thanks
Russ
Oct 06, 2021, 10:41 PM
RC boat Rock Star
You can use a silicone sealer to make a gasket.


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