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Workshop => Engine and Bottom End => Topic started by: broken1 on November 06, 2015, 01:37:09 PM

Title: JP cylinder head
Post by: broken1 on November 06, 2015, 01:37:09 PM

I got this JP head shell in a parts lot & looking for a dome. It looks identical to a pro design head except for the spigot & the dome is a little different.(http://forums.trx250r.org/vbulletin_imports/322_6691_2017-04-18_4496.jpg) (http://forums.trx250r.org/vbulletin_imports/322_6692_2017-04-18_5247.jpg)

The dome on the JP head seats against the inside of the head shell instead of going through it like the pro design. If I can't find a dome I might try to modify a pro design dome to fit:
(http://forums.trx250r.org/vbulletin_imports/322_6693_2017-04-18_9178.jpg)

Title: JP cylinder head
Post by: Skeans1 on November 06, 2015, 03:58:32 PM

Kevin try this place they look like they use that style of dome from the top. http://www.vhm.nl/?navi=cylinderheads

Title: JP cylinder head
Post by: broken1 on November 06, 2015, 05:08:32 PM

Those look similar but you can see where the hole in the head shell is large enough to allow the dome to sit beyond flush so the plug seat's against the dome. On the JP head the plug sealing washer seats against the top of the head shell & not the dome. It looks like an extended reach plug might be required on this JP head.

Title: JP cylinder head
Post by: Iceracer on November 09, 2015, 02:59:20 PM

You ever Find a Dome for this Head?

Title: JP cylinder head
Post by: broken1 on November 09, 2015, 08:57:35 PM

Quote from: Iceracer;60874

You ever Find a Dome for this Head?

No. Do you happen to have a dome for it?

Title: JP cylinder head
Post by: Hawaiiysr on November 10, 2015, 11:44:57 AM

He can make one:)

Title: JP cylinder head
Post by: Iceracer on November 10, 2015, 01:26:03 PM

I have a couple old Domes I could cut to see if you could use a modified off the shelf pro design, I was thinkin it looked similar to a Sprock Tri Z Dome also.

Title: JP cylinder head
Post by: aztecgwynn on November 10, 2015, 02:27:59 PM

Why don't you call pro design and see if you can send your head and owner can cut you a dome? Owner of pro design is actually a real nice helpful guy!!!

Title: JP cylinder head
Post by: Iceracer on November 10, 2015, 04:10:18 PM

Tom is extremely helpful but typically wont cut singles, I have to buy 6 blanks at a time to get The Domes I want for my Lt engines.  I can have him stop at any point so I could finish the domes.

Title: JP cylinder head
Post by: broken1 on November 11, 2015, 03:27:14 AM

I measured a pro design dome & it won't work to modify it for the JP head so if anybody has a JP dome they could take pictures of from the top & bottom & maybe some measurements, it would be greatly appreciated. Thanks.

Title: JP cylinder head
Post by: Hawaiiysr on November 11, 2015, 10:19:39 AM

Dremel that beeech