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Head Porting

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All the power is in the heads (and cams). An engine is an air pump. The more effeciently it can move air in and out, the more powerful it will be.

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lol, I know that.

BUT some engines are more effecient right out of the box then others from the factory if you know what I mean.

Is it worth it to do that to a DRZ head?

My question is how much is this worth? :bonk:

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if you do over size valves and are making over 50hp,yes its worth it.

the stock drz head flows better than a stock crf450 head.

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if you do over size valves and are making over 50hp,yes its worth it.

the stock drz head flows better than a stock crf450 head.

I gotta make sure my buddy with the crf450 sees this!:bonk:

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I had the head work done by "Sparks Racing" out of Bakersfield, CA. He does a lot of quad motors and builds pipes.

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what he did is pretty mild which is fine with stock size valves.just dont expect miracles.

my head porting which is RHC spin off is a bit more aggresive.

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what he did is pretty mild which is fine with stock size valves.just dont expect miracles.

my head porting which is RHC spin off is a bit more aggresive.

Any chance of a few pics Eddie, don't want you to give any big secrets away but, I would be interested.

I have not done any port work since the mid 70's when I did a few Honda CB250 heads, with big valves and cams.

Oh, and a 650cc Ariel twin :bonk: single carb iron head with big valves and a re-worked spitfire cam.

Neil. :bonk::naughty::D

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i will take some of OSITECHS head early in the week

Thanks Eddie, I just wish I had, owned a camera in the 70's, I have no pics of any of my old bikes, or places I went on them.

Imagine Isle of Man TT, 1973 to 1980 and no pics 😛

All those famous old bikes, and all I have are the memories, and the DVD coverage you can buy today.

But what hurts most is the bikes I built, and modified and no pics :bonk:

Neil. :bonk::naughty::D

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theres alot of things i did in my pre internet days that i wish i had a record of.

im doing the wiring and finishing touches on a hayabusa powered sandrail currently.

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im doing the wiring and finishing touches on a hayabusa powered sandrail currently.

Never seen one of them, pics ?

There are a few kit cars over here that use Busa engines, and one that uses 2.

Or 2 GSXR 1000 engines to give four wheel drive, in a Lotus 7 type chassis for an all up

weight of less than half a ton :bonk:

Now that has to be fun round the country lanes.

Neil. :bonk::naughty::D

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if you do over size valves and are making over 50hp,yes its worth it.

the stock drz head flows better than a stock crf450 head.

Do I gain anything if I port the head?

My combo is:

-Rhc valves,springs and cams.

-Trc ti

-FCR41mx

-Athena 434

-open airbox

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im doing the wiring and finishing touches on a hayabusa powered sandrail currently.

any pictures???

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Do I gain anything if I port the head?

My combo is:

-Rhc valves,springs and cams.

-Trc ti

-FCR41mx

-Athena 434

-open airbox

with oversize valves,yes.

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any pictures???

looks pretty much just like the ones in the link.

i will post a pic of me working on it.everyone in the shop finds it amusing watching me.

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