MCCULLOCH Keep stock carb after big bore kit install??

[remiskeet]

I have a 2006 Troy-Bilt / McCulloch (Jenn Feng era) 35cc chainsaw (TB3516cc/MCC1635a). I have access to a very nicely priced piston/cylinder kit from the 40cc version (MCC1840b). After comparing the IPLs of both saws, I see that beyond the P/C , the difference is the carb: WT808 vs WT808A. Both models share the same rebuild kit K20-WAT. It makes sense to me that the"A" variant might have a slightly wider venturi area. Could I get by with the 808??

Perhaps I could phrase it this way: Has someone installed a "big bore" piston/cylinder kit and been successful using the stock carburetor??
Thanks for any input.

 

[Mycamaro_68]

I'm not sure about you specific model. But at one time I had a similar mcculloch (I believe it was a 38cc) that had a 42cc motor from the factory. I believe they did that a lot. Instead of having multiple engines the just used larger engines but marketed them as smaller. So you might want to verify that you don't already have a larger engine.

 

[remiskeet]

Thanks @Mycamaro_68 . Definitely worth pulling the cylinder to check with micrometer

I'm not sure about you specific model. But at one time I had a similar mcculloch (I believe it was a 38cc) that had a 42cc motor from the factory. I believe they did that a lot. Instead of having multiple engines the just used larger engines but marketed them as smaller. So you might want to verify that you don't already have a larger engine.

 

[Mycamaro_68]

Thanks @Mycamaro_68 . Definitely worth pulling the cylinder to check with micrometer

You can pull the muffler and stick a stray or popsicle stick or something like that into the exhaust port until it touches the opposite side cylinder wall. Then rotate the flywheel just hard enough to leave a mark on the stick or straw. Then you can measure the stick or straw to find out the bore dimension.

 

[remiskeet]

You can pull the muffler and stick a stray or popsicle stick or something like that into the exhaust port until it touches the opposite side cylinder wall. Then rotate the flywheel just hard enough to leave a mark on the stick or straw. Then you can measure the stick or straw to find out the bore dimension.

You are obviously thinking with a clearer head than mine! I think I need a tattoo on back of both hands , that says " Work Smarter, Not Harder" .
Thanks @Mycamaro_68

 

[Mycamaro_68]

You are obviously thinking with a clearer head than mine! I think I need a tattoo on back of both hands , that says " Work Smarter, Not Harder" .
Thanks @Mycamaro_68

I've just picked up little tips and tricks from hanging around on the forum here. I take zero credit for thinking that up.

 

[Al Smith]

Just as general information that is McCulloch in name only . That said more than likely it has enough carb already unless it's a fixed main jet and even then probably enough .