Author Topic: Kyle Burnham #81 2017 Racing Season.... Big Changes!!!! (Read 15985 times)

Burns363R · « **Reply #30 on:** February 28, 2017, 08:59:07 AM »

Arival from LED.

Michael88R · « **Reply #31 on:** February 28, 2017, 09:48:21 AM »

I'm surprised u are going with an Esr cylinder instead of a sphynx. Reason?

Burns363R · « **Reply #32 on:** February 28, 2017, 10:15:22 AM »

Sphynx are hit in miss from what i have seen. Some are low deck exhaust and some are high. I had a low deck one that run really hard for MX. A high deck one is hard to get to run well at mid range and low rpm. I have been told by a couple builders that they can get the same hp from an ESR easier. Arlan wanted to run ESR with our new builds, so I said okay lets do it.

etccb · « **Reply #33 on:** February 28, 2017, 10:27:09 AM »

I have heard the same for a long time but builders have had a hard time making those statements public because of their sales $$$$$ they would rather push the cpi vs let you know how good the esr is. I am glad to see arlan and esr having a good business relationship. That is good for both and the long term 250r product future imo.

Michael88R · « **Reply #34 on:** February 28, 2017, 11:43:26 AM »

Quote from: Burns363R;72039

Sphynx are hit in miss from what i have seen. Some are low deck exhaust and some are high. I had a low deck one that run really hard for MX. A high deck one is hard to get to run well at mid range and low rpm. I have been told by a couple builders that they can get the same hp from an ESR easier. Arlan wanted to run ESR with our new builds, so I said okay lets do it.

Good reasons. �� I've been wanting to try a nikisil cylinder. My old pro-x 330 had a really soft sleeve. I was told by a former Esr mechanic that the hardness of the pro-x sleeves had a wide range. Hopefully esr's new ones are better.

Michael88R · « **Reply #35 on:** February 28, 2017, 11:44:32 AM »

Definitely best to go with Arlen's suggestion.

Burns363R · « **Reply #36 on:** February 28, 2017, 11:45:00 AM »

I will miss the Nikasil. That was the only drawback i can think of really moving to an ESR. I had some issues with one of there early on 330pv bolt on kits. So lets up they had that figured out to.

sameltoe · « **Reply #37 on:** February 28, 2017, 01:25:38 PM »

Quote from: Burns363R;72043

I will miss the Nikasil. That was the only drawback i can think of really moving to an ESR. I had some issues with one of there early on 330pv bolt on kits. So lets up they had that figured out to.

You can always Nikasil the esr cylinder...

Burns363R · « **Reply #38 on:** March 01, 2017, 09:02:42 AM »

Some updates from a late night int he shop. I also have an ESR clutch cover and water cover in blue. I havent installed due to not having gaskets for the water pump cover and needing to do some clearancing on the quick change for my auto clutch. Also im supposed to have a blue head, but didnt get that from ESR yet.

Burns363R · « **Reply #39 on:** March 01, 2017, 09:04:41 AM »

Heres a little size comparison from a stock piston to my big 81mm piston.

sameltoe · « **Reply #40 on:** March 01, 2017, 02:34:23 PM »

You running a 350G or D? I was thinking of trying his hand coned D on my xc bike and putting the G on the duner.

Burns363R · « **Reply #41 on:** March 01, 2017, 04:08:40 PM »

Im running a G currently.

Skeans1 · « **Reply #42 on:** March 01, 2017, 07:05:30 PM »

Kyle is that a stroker or a stock crank?

Burns363R · « **Reply #43 on:** March 01, 2017, 07:06:12 PM »

Stock stroke.

Michael88R · « **Reply #44 on:** March 01, 2017, 08:15:32 PM »

Interesting engine u are building. 81x72 makes it 371cc. Any special set ups for this? Do the cases have to be bored larger than they normally are for a 78mm piston? Any special mods on the crank? Balancing?