i have tryed os p4 and p3. but i have been running the od 99t for some time now and like them. i running 30% werks fuel

What plugs are you using? Symptoms wound very similar to too cold of a plug. Do the engines still have good compression? How long will they idle before dying?

The King/Tebo engines come with different carbs then the Discovery engines do.. The turns needle settings on our engines will not match your engine.. Best advice is to find someone near you to help you. Tuning over the internet is near impossible..

We've used the Orion #5 all the time. I think one ot the guys tried the OS P3 and/or P4, and that changed the behaviour, but still not stable.

Sometimes they idle for a long time, but never stable. Sometimes they die almost instantly.

Compression is low, but not gone. We've had lots of engines running strong with less compression. Except one of the engines, that one I suspect is worn out (from running too lean HSN I think...).

They act like theres an air leak somewhere, but I cant find any. And they are all acting the same way...

Check the front bearings. With the motor running spray carb cleaner toward the flywheel and if it stalls the the front bearing is bad. And that will cause tuning and idle problems

thanks, I'll check that.

We'll do a complete teardown and rebuild on one of the engines first. Probably using gasket seal this time. How I hate airleaks...

My Trinty Extech .24 acted just like what your diescribing at about 4 gallons. I had to have it repinched and I got about 4 more gallons out of it before I shelved it. But it still runs.. I let mine go a bit lean for a little too long.. but It would fire right up, and would flame out after completely warm. But had enough compression you wouldn't think there was a problem.. LM engines seem teasy to lean too far on top. They perform good for a good while, but they will loose compression fairly quickly if left on that edge a bit too long..

Check it for air leaks and reseal it.

My suggestion if it isn't an air leak would be to try a repinch and see if that doesn't help it.
Sorry I have no better advice to offer...

the orion discovery is on the brake in table. Very solid so far good stable idle im pleased with purchase if it keeps this!

@Scotty: I suspect you are correct assuming a little too lean a little too long...

Will se if I can find someone around here that repinches then.

I was told there is someone who expands the piston instead of pinching the sleeve. Supposedly this makes it better because its the piston that wears, not the sleeve. Anyone tried this, and/or knows who does this?

Now why cant the manufacturers sell just the pistons...

Keep this a secret.. But I have hear of one person doing what you described. He had good luck and got another 2-3 gallons. What he did was use a Tubing Cutter, and ever so gently run the cutting wheel around the oil groove. This expanded the piston in that area enough to seal well. He went very slowly and checked the fit in the sleeve a bagilion times before he was satisifed.. But a quick few tanks for break-in and he was racing..

All that said I would send it to RayARacing and have him pinch the sleeve. he is the BEST in the business. There are others that do it and they might be as good, but they can't be better..

I have begun break in of my motor. It did not come with a plug so right now I am breaking it in using a OS p3 plug. 3 tanks in and going well. I drained my 2200mah lipo in my starter box 3 times, before it completed its first tank. I am so excited.

Ironically enough I have finall started the break-in of my 2nd Discovery 5-port. This one is going in buggy. The one in truggy is so easy and much fun to drive, I wanted them to be the same.. I did get a few more tanls run through then you did. I am just over 1 Liter which is about 9 tanks.. I'm hoping to get 8-9 more this week then I'm going to St. Louis for Byrons Fuel Nitro Challenge..

Installed 2013 pipe and orion #6 plug and fired up the discovery let it warm up took few back and forths at house to get full warm then threw it up on the bench and idle was perfect no flexing just good solid idle. Hopefully i ha e a good day with it with the right pipe and plug. Could mot get it to idle right with p3 plug and os pipe bit habe the right stuff now and i think it is going to be very good

Hi guys

I want to replace my front bearing on my JTP and want to know if a novarossi bearing should fit? Thanks

Yup, will fit no probs. Use the Nova 17011 for best protection against dust while still having optimal lubrication.