boring

How far is too far too bore my i/c motor. .150 piston would bore the sleeve out but would .120 be cool?

I've been contemplating the idea of putting a bigger piston in my gx200. I've done a little research and found that the stock bore is 68mm on the gx200 and that the stock bore on a gx390 is 88mm. Is it possible to bore a gx200 to a 88mm? and would the stocker gx200 rod work with the 390, I'm...

Hi guys, I was wondering, I have 2 5hp Briggs blocks that have scored cylinders. Woud I be able to get them bored out so I could use a oversized +.030'' raptor piston? :shrug: Instead of having to get it sleeved. Here is the link to the piston I am looking at, it says unchromed, is that a...

Hi, I was just wondering how I would go about boring a gx200/gx160 Carburettor on a mill? Does anyone know the maximum Venturi and butterfly sizes? I do not want to use epoxy. Here is the carb after cleaning with citric acid. It was horrible before. Thanks Rob

Howdy, i was wandering if any of the engine guru's on here have any idea how far you can bore a gx200 past stock? thanks in advance :thumbsup:

I own the db30 baja racer and I have been looking around this forum for quite a while and have found many people with the same problem as me. Frankly the minibike is pretty slow and I want some more power. Putting a 6.5hp engine in it sounds like a good idea, but I also saw the jackshaft...

Hi all I picked up a 2nd HS40 for myself and something didnt sound right inside of it.. no big deal to me.. If anything I can use it for parts. After I took it apart I noticed that there is quite a bit of play on the rod bearing area. After removing the piston I also noticed that there are 2...

A search did not turn up too many hits. So question: Those of you that do put larger than 25mm valves in Clone heads. How much can you bore from the stock seat before they become a weak point. I read 27mm quite often but lately I saw something a bit bigger at 27.5 on something. What do the...

how far can you bore out a 5hp cool bore block? i got a block that was ran with low oil and has some cylinder wall galling.

make an offer. my roommate and i want it gone. we need space for a chest freezer for Costco runs (would be willing to trade for a nice, newer one). it works great but is just missing some of the tooling shit or whatever. the company still makes this model so parts are available. local only...