300ex - Wiseco back to Honda piston

[not2hi]

i'm replacing the piston and rings in a 98 300ex. Currently it has a Wiseco (stock bore) and rings (mukini carb, cam, FMF mega 2, no limit CDI).

I'm seriously considering going back to a Honda piston (.025 over) and rings. I'm tired of mixing premium pump gas and octane boost and locating race fuel has proved to be a nightmare. It would be so nice to just run down to the gas station and fill er up, not to mention the times when we couldn't ride because i forgot to buy boost.

My question is how much will we really lose by going back to a Honda piston? We're not racing, just riding trails and on backyard type tracks.

THX

[Dave400ex]

The Piston doesn`t matter it`s what Compression you run. Get a JE if they make them for 300ex`s.

[not2hi]

well, and correct me if i'm wrong...Wiseco is the only one making a piston for the 300ex, and its 11:1 comp. JE or Ross do not make pistons for the 300EX. A stock Honda is 8.9:1 comp.

[Dave400ex]

Email Sparks and ask them what kind of Pistons they use in the 300ex.

[not2hi]

anyone familiar with Pro-X pistons that Dennis Kirk sells? what's the comp on those?

Sparks didn't have much to say to help.

[Dave400ex]

Well I have heard very good things about Pro-X. You should be able to choose your Compression. Just call a Engine Builder up and ask. I`m not sure what Pistons Duncan runs.

[two_baaalls]

hmmm, well you dont need race fuel at 11:1!

[Dave400ex]

It would be smart to at least mix the Gas. Half Race, Half Pump.

[two_baaalls]

You mean mix not miss..

You can tell when your bike is pinging caused by lack of octane. You will know. Ask a pro. Call Mickey Dunlap at 4-stroke tech. GT Thunder, Sparks, anyone. They'll all tell you the same, pump gas is fine for 11:1.

Just have fun. Thats the most important thing.