Wondering if anyone has or knows of a company who has these parts. Just something to put a little more umph in a tired motor (OK , it's more for me than my dauthers, but I can't let my uncles boy beat them on that tricked out Suzuki 50 auto )I'm sure some company makes these parts, Honda's been building these engines for what, a 150 years or so. Thanks.

 

Well,

Cobra makes a megaphone exhaust for it for like 85 bucks or so. THen i would get a universal k&n filter. After you do that you could change the gearing, and then bore that puppy out. I'm not sure but powroll MIGHT make a big bore kit but i'm noot positive. hope i could help

 

Skip the pipe, you don't get much power out of 4-stoke pipes with a stock motor.

Here's what to do. First, call Powroll and see if they know how large of bore you can run in the stock sleeve. Then call JE pistons, I believe they make custom pistons (I doubt they stock trx 70 pistons). If you want to still run pump gas (92 octane), have them make you one with 11:1 compression, with the max bore you can run in the stock sleeve. If you want to run half race gas, half pump gas, you can probably get away with 12:1 compression.

Even with 11:1 compression, that thing will fly. Plus, it'll totally be a sleeper.

Now, if it still gets beat after the piston upgrade, then follow 300EXKING's advice, but remember to rejet after pipe and filter.

Edit: Sorry 300EXKING, I didn't fully read the part regarding a bore in your post. I would, however, go high compression and bore first, then pipe if necessary.

ogre