Found a used HSP billet cylinder head with 12 to 1 dome in very good condition. Are these good bolt-ons? I see a few of you are running the HSP unit.

I went the Hot Seat's website and they clain there billet head increases low to mid range power/torque and hepls in the engines colling ability. Sounds good? How well does this unit work?

If I get this, I will be putting it on at the same time that I install my new Delta 2 V-Force reed valve and spacer.

'96 Scrambler 400 4X4
HPD Trail pipe/FMF Turbine Core II
HPD clutch kit
K&N filter
Boyesen Power Reeds
Wiseco piston

more to come....

 

It definately won't hurt. Is it O-ringed like the HPD units? I'm not too familiar with HPS stuff but make sure they offer other domes incase you ever need one.

 

the hotseat head uses a gasket instead of o-rings, unless they have changed it just recently

 

So is anyone out there running one of these heads? Is it good?

One more question...for the money which is better, having your stock head modified or a billet head from HPD or HSP?

I do like the looks of the billet head.

 

$50 or $250, sounds like a no-brainer to me, especially since you can buy a spare stock one for $100. If you're running enough compression to need the cylinder sandwich, you will probably have to go with the billet one. And you're right, they look great, but I couldn't justify the extra price. They also claim better cooling, but I haven't seen any tests to prove this. It makes sense in theory, since the coolant flows evenly out the head, but I don't know.

Waylan

 

Get the billet head with the o-rings, you will eliminate any problems that could happen with head gaskets, you get better cooling and you can change the domes to change your compression and it looks good especially when polished.

 

adamnieman,

I'm running one and couldn't be happier with it. The things to remember are; #1 always use premium fuel in it (92 octane or better) and #2 use one size colder spark plug (BR9ES).

 

Mike,

Thanks for the imput. Glad you like yours. I think I will make the guy an offer. One question, what is the idea of running the colder spark plug...I have heard this being done before.

I went to your website and I see your quad is running parts from just about everyone. Looks cool.

Adam

 

If any of you people that like the stock 400 heads want some let me know, I have to sitting here with hardle no use on them.

 

Adam,

For some reason or another the one size colder spark plug works better with the higher compression heads. I think it has something to do with keeping pre-ignition doen to a minimum by getting rid of heat. I started running one in my quad last summer and the fan never kicked on once as opposed to the BR8ES I used to use.