wierd_dragon

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hi,

i have a K&B 3.5cc outboard engine and i need a new piston and sleeve because this one i have blew out of size so i went to mecoa and there's multiple ones:

33-8901 - Piston & Sleeve (Std timing - requires teflon pads on wrist pin) OB

33-8902 - Piston & Sleeve, Gold head SS (pipe timing - requires Teflon pads on wrist pin) OB

33-8903 - Piston & Sleeve, Gold Head SS (pipe timing - requires snap rings on wrist pin)

the thing that i don't get is what's pipe timing and what's this pin or ring thing?

thanks

Hydro Junkie

Timing has to do with how long the intake and exhaust ports are openned on each stroke of the piston. It varies by the kind of exhaust system you run on the engine. An engine set up for a tuned pipe will have a different timing cycle than a sport engine. Think of it as having a mild cam in a car engine, as compaired to a very radical race cam.
As for the wrist pin and all of that, the wrist pin is the rod that is used to hold the piston to the conecting rod. The teflon pads and snap rings are used to hold the the pin in the piston, preventing it from moving and damaging your engine.
Hope this helps

wierd_dragon

My Feedback: (1)

yes it does help, however, i don't have a sport engine nor a tuned pipe on this engine, it's just the engine, connected to the lower assembly, so in this case, what's best? Thanks hydro

Hydro Junkie

At this point, I/we will need to see some pics of the engine to go any further. Sorry to be the bearer of bad news[]