280 Big Bore kits

[TRANSPORTER]

Done a search before posting but didnt really get anything. Has anyone gota 280 kit fitted to their 250, Ive been after one for ages and will probably still be wanting one for ages aswell but would like to know ease of installation, any problems on running them etc etc.
My XR has 49000 klicks on the clock, Second piston, and set of valves and thats it, so a reliable lump so understandably abit reluctant to do any work on it as its still going strong, but the idea of more torque is getting to me.

[walesxr]

From experience, I would keep your 250 standard and just ride it harder. Yes these big bore kits do give extra power but can put a strain on the reliability on the engine.

[insainwayne]

I have a 280 fitted to my XR, It's one size under max bore, runs standard head gasket, carb and exhaust. I've run it for 1000s of miles, all it really dose if give abit more of the bottem end, there has been no problems. I would say do it, if you are replacing the piston, you have nothink to lose.

[Daz Max]

Got a deal on here- XR Big bore kits from Thumping Racing
Was 295,now only 185 for a Thumper racing kit.
Seems good.

[insainwayne]

Wiseco pistons are around £100 to buy, thats what I have, and a bored is around £30 to be done. and your be on the way..

[Kes]

I paid $158 (£100) Wiseco delivered from the States with a top and bottom gasket off their ebay .

The rebore came to £60 as it done in 3 passes as it goes out 4mm.

[malwelder]

Done a search before posting but didnt really get anything. Has anyone gota 280 kit fitted to their 250, Ive been after one for ages and will probably still be wanting one for ages aswell but would like to know ease of installation, any problems on running them etc etc.
My XR has 49000 klicks on the clock, Second piston, and set of valves and thats it, so a reliable lump so understandably abit reluctant to do any work on it as its still going strong, but the idea of more torque is getting to me.

hi mine has a 5mm piston fitted hi flow headers and a dep pipe it goes like ---- of a shiny stick crank seems fine but it needs to run o hi octane unleaded 97ish to get the best out of it and morris super mx oil a must