Am I right to belive if my engine is screwed, ie no compresion due to wear or damage on the piston or sleeve, I can replace the piston and sleeve thus having what could be considered as a new engine?...

Yes. But it wont be a new engine as all the other components will be worn (bearings, carb, case, crank and conrod). Although most piston and liner sets do come with the conrod it is also a good idea to have a good look at the crankshaft (especialy where the conrod is fitted) for any dicolouring as the indicates problems i.e. Blueing - overheating (usually over lean) and Browning - Overlubing (Too rich). There are mny other reasons for discolouring but these are the main ones.

Also if it's just down to cylinder wear then a PINCH isn't out of the question. Easily done DIY stylee. See the other thread.

Nice one, I was just wondering as my current Hyper 7 is my first buggy and I only started getting advice on engines after I had run a good few tanks through it, currently it runs fine but it does not respond to tweaking (HSN, LSN) as it should, my mate also has one (not Phil) that acts almost opposite to mine, After reading through the Ultimate Nitro Engine guide and also based on the general concensus of opinion on here I would say we have got two of the much talked about dodgy Hyper 21 carbs. This being the case I have ordered a OS 20E carb and was wondering if I could rebreak my engine in if it is necessary at some point in the future, as I dotn want to spend £50 on a carb to put on a worn or damaged engine........

EDIT: BTW is the OS 20E a slide carb or rotary?, same as for the stock hyper 21 is that slide or rotary?

Your engine should be fine. Those carbs were infamous for being *****es to tune. The OS is a good choice and should give you no grief at all. Tuning is the same as the hyper carb so crack on. Nice auto edit.

The OS 20E is a slide carb.

-SlingItX

So is the hyper 21's

Sherak,

If your engine is worn out, you might want to check into having it "pinched". I know you're in the UK, but there is a guy here in the states that pioneered the technic and he's the best. He goes by OSRocket on ebay and for ~$20 USD you can have the sleeve pinched around the piston and get all of your compression back. I don't know what international shipping would run you, but this guy is worth it as he's the only one I'd trust my piston sleeve to.

I just sent my the piston and sleeve from my 8-port to him a month or so ago. I haven't run the engine yet (too cold), but when I put it back together, I my starter box can't turn it over because of the pinch it now has. It's insanely tight now.

Check out the other thread, you see nothing but kudos for OSRocket and his pinch process.

-RobH

Rob return shipping would be almost £30 ( $48) does that sound worth it to you, coz it dont to me. A new piston, rod and liner is cheaper and guarenteed to work. And you wouldn't have to wait a month to see it again.

$48 crap. Never mind then. Man the UK needs their own OSRocket.

Good Luck Guys

$48 and that's just regular postage. Express would be nearer $30 each way. If you want Sherak you can send it to me if it is truely dead and I'll squeeze more life out of it just for the chalange and P&P.

I dont think its dead, its just I know I didnt break it in properly and now I know more about Nitro I wanted to be sure that I wasnt throwing £50 at a engine which may be worn out in a few months, the fact I can buy and new sleeve, or even pinch the old one is all I needed to know... Thanks guys,...

A pleasure.