Running a higher then stock compression (HSP billet head with 12 to 1 dome) I took someones advice and put in one heat range colder plug, 9 vs. 8. Then I read the new HPD catolog saying something about the BRP resitor plugs are better because they advance the timing some and fire easier. So now I am running a BPR9ES. Is this the best setup or I'm I missing something here?

'96 Scrambler 400 4X4
HPD Tail Pipe/FMF Turbine Core II
HPD clutch kit
K&N filter
Boyesen Power Reeds
Wiseco piston
HSP billet head

 

Adam, like the HPD advice, with the higher compression, the cooler plug helps. With the 12:1 dome you could really run either the 8 or 9. Have you retarded your timing 2 degrees yet? This also creates more hp out of this motor. You'll need a timing light for a 2 stroke though.

Ken

 

Adamnieman,whats the deal with Hsp head?Any improvement over stock?I have a similar setup on my sport 400 and was just wondering.

98 sport 400L
Rcr stage 1
HSP 42mm flattie
Hpd clutched
v force delta reed cage
wiseco piston

 

biggin,

The Hot Seat billet head is a great bolt-on in my opinion. I feel I gained a few horses from low to high. It is similar to the stock head, in fact it uses the stock head gasket where the HPD head uses an o-ring to seal her up.

It raises the compression so you will need to run 92 or better octane fuel...no big deal really. Is it worth the $230 for a new one? Hard to say. Porting is the best buy for the money aside from a good pipe. Thats the next item on my wish list.

 

I agree that porting would be the next step for both of our quads.I just cannot bear the thought of not riding for weeks while the work was done.I just was curious about the head,thanks.

 

biggin,

Yeah..I hear you there. I am not sure how long it takes to get ones cylinder ported and returned. But since I live in Iowa I can use our long cold winters as "down time" and get more toys on the Scrammy. But I must admit, it is fun to kick her sideways in the snow from time to time!

 

Snow,what is that!?(j/k).If it wasn't for tour of duty in Germany Snow would belike the moon to me.Seriously,we got some snow in Jan of this year in SC and I went for a ride.Man,A fresh virgin blanket of snow really tells a story about whats in the woods and fields and where they go.The deer tracks were every where on the edge of the winter wheat fields.To bad the season was over or else I'd had another stand setup real quick.That was back when I had my Bayou, I kind of miss it. It was quiet and smooth to ride.Later.

 

i run br9evx in my modded hpd scrambler 400 i get good results,timing set at 21.5 degree,gaping of the plug at 18-19.