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250 drummie · Post by **250 drummie** » Wed Apr 13, 2011 5:47 am

I am building a new motor for the track at the moment and have been match porting a few things and now I am looking at the head

. How much can be taken off the head safely. I dont want a time bomb but a few more HP is always nice $\:D/$ .

TwoStroke Institute · Thu Apr 14, 2011 10:35 am

Set it to 0.8mm and you will be fine.

Luders · Post by **Luders** » Thu Apr 14, 2011 10:47 am

PM me your email address and I'll send you some subject data

KR-1R · Post by **KR-1R** » Thu Apr 14, 2011 9:16 pm

.
.
what if you are running on diesel?

Post by **500bernie** » Fri Apr 15, 2011 8:27 am

Nice inserts,

Dumb question.....how are they held in location?
I presume they overhang and are compressed, but is that it?
Any photos of them with the head?

Cheers,
Bernie

KR-1R · Post by **KR-1R** » Sun Apr 17, 2011 10:06 pm

.
.
JUST GOT the inserts (VHM) in the mail
making use of abandoned heads I have bought with old parts

two recesses (steps/benches) will be created as the old chambers are machined out of the head - One at the sparkplug seal the other at the head-barrel surface.
Both steps will each serve to locate the insert and clamp it down.
The head gasket will still be retained (at this stage) as I'm not intending on o-ringing around the KIPs valves.

JanBros · Post by **JanBros** » Mon Apr 18, 2011 12:37 am

KR-1R wrote:.
.

The head gasket will still be retained (at this stage) as I'm not intending on o-ringing around the KIPs valves.

there's no need to O-ring the Kips valves. I'm running an O-ringed head for more then 10 years now and never had problems with it

KR-1R · Post by **KR-1R** » Mon Apr 18, 2011 1:28 am

JanBros wrote: I'm running an O-ringed head for more then 10 years now and never had problems with it

are we talking dog years?

Post by **500bernie** » Mon Apr 18, 2011 9:14 am

I think "O Ringing" the head is something I may consider, as modifying the headgaskets to suit the larger bore on the 300 is a pain.
But those inserts look fantastic..... =D>
Perhaps a job for next winter!

Cheers
Bernie

JanBros · Post by **JanBros** » Mon Apr 18, 2011 8:35 pm

KR-1R wrote:

JanBros wrote: I'm running an O-ringed head for more then 10 years now and never had problems with it
are we talking dog years?

I've never had any sealing problem's

look at the picture and you'll notice the black stuff arround the KIPS has gone nowhere further

If you read that hole topic, you'll know what happened and that it had nothing to do with the O-rings or the lack off them arround the KIPS

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