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I would stay away from mcb they have been comming appart int the mountians. Seem to work good for the flat landers. To hard on them I the steep n deep
 
I would stay away from mcb they have been comming appart int the mountians. Seem to work good for the flat landers. To hard on them I the steep n deep

Yeah i'm not sure about that one. mine gets loaded with 85 octane and has the RK tek Recurve with a 13:1 head using MCB duals with doo oil. rode and abused all the time. literally no warmups. I held it for 2-3 minutes wfo straight dinking around in a meadow full of pow one day last season. NO power fade. Its nice. It feels like and arctic cat climbing. the power just stays on all the way until you let off.

The whole coming apart thing is just hear say without any real data to back it up. They all have potential to fail. So there have been a hand ful of guys shell out an engine. theres been handfuls more of stockers and mod engines of anykind do the same thing.

In fact my experience has been that these have been the most reliable set that i've had install in the REv to date. This is piston set #4... and the last for at least several thousand miles. Wished these would have been around sooner. Would have save lots of headaches... thats for sure.

Easy starting too. Lights off in the first pull usually. Better have a good pull rope too. Almost feels like pulling over an M1000. Not quite, but compared to it stock, and with various drop in piston combo's, the hardest to pull over no doubt. The wife doesn't like how hard it pulls over, but now that she's learned to get a run at it, its all good.

I liked them so much that the Xp is getting the exact same treatment this season.
 
Yeah i'm not sure about that one. mine gets loaded with 85 octane and has the RK tek Recurve with a 13:1 head using MCB duals with doo oil. rode and abused all the time. literally no warmups. I held it for 2-3 minutes wfo straight dinking around in a meadow full of pow one day last season. NO power fade. Its nice. It feels like and arctic cat climbing. the power just stays on all the way until you let off.

The whole coming apart thing is just hear say without any real data to back it up. They all have potential to fail. So there have been a hand ful of guys shell out an engine. theres been handfuls more of stockers and mod engines of anykind do the same thing.

In fact my experience has been that these have been the most reliable set that i've had install in the REv to date. This is piston set #4... and the last for at least several thousand miles. Wished these would have been around sooner. Would have save lots of headaches... thats for sure.

Easy starting too. Lights off in the first pull usually. Better have a good pull rope too. Almost feels like pulling over an M1000. Not quite, but compared to it stock, and with various drop in piston combo's, the hardest to pull over no doubt. The wife doesn't like how hard it pulls over, but now that she's learned to get a run at it, its all good.

I liked them so much that the Xp is getting the exact same treatment this season.

That's what I've heard as well and BJ at Sled Heads sold a LOT of them to mtn riders with ZERO issues so consider the source!

Have FUN!

G MAN
 
If any body wants to talk about pistons and what-not feel free to call me anytime... As far as hear-say on the Chinese pistons,,, we can talk about that as well... I supplied quite a few cases and cranks for people last season who ran chinese pistons when they fail, it is catastrophic.... take it for what it is worth... not trying to dog anybody's stuff..but i DOO have some REAL experiences from personal use and customers use... many have great luck wih many chinese engine components..
 
Not just hear say. I'm unfortunetly speaking fron experience. I'm glad yours are working out for you.
I have built 5 ho motors 2 went down one was my own. The problem is when they go they don't just ware out they break the piston skirts off. No warning. Jettin was correct not deto just let go. One had 1500 the other 1800. The other three are still running great. I personally don't trust them any more so I'm. Runninh kelsys drop in kit alredy had the head so just needed the domes and pistons.
I just wanted to give my opinion and experience

Wardy
Yeah i'm not sure about that one. mine gets loaded with 85 octane and has the RK tek Recurve with a 13:1 head using MCB duals with doo oil. rode and abused all the time. literally no warmups. I held it for 2-3 minutes wfo straight dinking around in a meadow full of pow one day last season. NO power fade. Its nice. It feels like and arctic cat climbing. the power just stays on all the way until you let off.

The whole coming apart thing is just hear say without any real data to back it up. They all have potential to fail. So there have been a hand ful of guys shell out an engine. theres been handfuls more of stockers and mod engines of anykind do the same thing.

In fact my experience has been that these have been the most reliable set that i've had install in the REv to date. This is piston set #4... and the last for at least several thousand miles. Wished these would have been around sooner. Would have save lots of headaches... thats for sure.

Easy starting too. Lights off in the first pull usually. Better have a good pull rope too. Almost feels like pulling over an M1000. Not quite, but compared to it stock, and with various drop in piston combo's, the hardest to pull over no doubt. The wife doesn't like how hard it pulls over, but now that she's learned to get a run at it, its all good.

I liked them so much that the Xp is getting the exact same treatment this season.
 
After my experience with forged pistons, for turn key reliability, cast is the only way.

Last I checked RKT you did not have Cast 800 replacement pistons avalible. Are they avalible now? Why not tell us about your product here and save everyone a phone call?

To my knowledge the only 2 ring replacement is the MCB piston. Everyone else is a single ring. Yours used to be a Forged wossner piston.

If you have dual ring cast pistons in 800cc that would be great, but it doens't sound like you do.

please correct me if i'm wrong.
 
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