Author Topic: OEM cylinder aftermarket head????????? (Read 5028 times)

trx250scar · « **on:** January 17, 2015, 01:11:18 PM »

Does anyone know if esr makes a head for an oem cylinder. Seems I had saw them before. Now when I look all I c is for pro x type cylinders. I am putting an OEM motor in my r and looking for something with better cooling, o ring instead of head gasket, and a dome so I can get more compression and run race fuel.

sanddad21 · « **Reply #1 on:** January 17, 2015, 01:23:16 PM »

Led may be able to help you out. Give them a call

F-Red · « **Reply #2 on:** January 17, 2015, 02:03:09 PM »

Does the cool head offer different domes?

broken1 · « **Reply #3 on:** January 17, 2015, 02:17:04 PM »

Quote from: F-Red;48850

Does the cool head offer different domes?

Yep, I've seen dome sizes from 18-22cc.

trx250scar · « **Reply #4 on:** January 17, 2015, 02:19:18 PM »

Coolhead with an oring is not an easy find. Most reguire gasket. I do not know for sure but I bet cool heads with o rings have been machined that way. Not sent from factory with o ring.

F-Red · « **Reply #5 on:** January 17, 2015, 02:21:58 PM »

If you disire this application, you could have both machined for o-rings.

Jerry Hall · « **Reply #6 on:** January 17, 2015, 11:18:59 PM »

Machining a head for 0-rings is a no-brainer. Setting up the head for a particular engine takes some time. Unfortunately there is a lot more involved in setting up a head for race gas than selecting a head with a particular volume!!!!!!!!!!!

broken1 · « **Reply #7 on:** January 18, 2015, 12:43:45 AM »

Quote from: trx250scar;48853

Coolhead with an oring is not an easy find. Most reguire gasket. I do not know for sure but I bet cool heads with o rings have been machined that way. Not sent from factory with o ring.

I heard that o-ring pro design cool heads were kind of rare but I have one that I got new back in the 90's that is factory o-ringed. I sold one I got in a parts lot that was also factory o-ring & had pat pend stamped on it. Should of kept that one for nostalgia.

Rupp250 · « **Reply #8 on:** January 18, 2015, 10:05:08 AM »

Why not talk to a reputable builder and just have your stock head cut and o-ringed for what you want?

I run one like that.

trx250scar · « **Reply #9 on:** January 18, 2015, 03:26:41 PM »

Not a bad idea.I honestly had never seen an OEM head that way.

jadleybray · « **Reply #10 on:** January 20, 2015, 06:53:50 PM »

for all intensive purposes, any "gasket" type head can be cut to accept orings instead
This is an OEM cylinder with a coolhead, oringed by JDI Racing

trx250scar · « **Reply #11 on:** January 20, 2015, 07:18:51 PM »

Nice. I am going to look into it with a builder