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September 9th, 2017, 02:08 AM   #21
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Originally Posted by Taffy View Post
he didn't say the head, he said the intake. get a CRF throttle body and see what happens

Taffy
Zip zero nothing, tried that isolated before modifying the head.
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September 9th, 2017, 02:19 AM   #22
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For a 450 trails bike the heads are pretty good imo, in the perspective of a high performance engine its not doing particularly well no.
These heads were not designed to be high performing so it will take some dramatic moves to change that, BUT you need to know where the narrow section is, and that is the heads wont flow enough to make any top end as they come. And still with a decent flowing head the cams arent going to lift enough to get any real performance out of it in perspective to other high performing bike engines.

Edit: While talking with Jens he said that no development was done for the 570, this model only existed in a market perspective on paper for the dev team.

Originally Posted by Alan View Post
Tom, would you mind elaborating on the the 'gas exchange' please? Are you saying the head/ports are ok for the 450 but restricted for the 570?
Thanks from bushmechanic and Alan

Last edited by TomTom; September 9th, 2017 at 02:29 AM.
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September 9th, 2017, 04:40 AM   #23
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Originally Posted by Taffy View Post
he didn't say the head, he said the intake. get a CRF throttle body and see what happens

Taffy
Here's a revelation for you Taffy - A cyl head has an intake. He didn't say 'throttle body', he said 'intake'.

Last edited by Alan; September 9th, 2017 at 04:47 AM.
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September 9th, 2017, 04:45 AM   #24
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Originally Posted by TomTom View Post
For a 450 trails bike the heads are pretty good imo, in the perspective of a high performance engine its not doing particularly well no.
These heads were not designed to be high performing so it will take some dramatic moves to change that, BUT you need to know where the narrow section is, and that is the heads wont flow enough to make any top end as they come. And still with a decent flowing head the cams arent going to lift enough to get any real performance out of it in perspective to other high performing bike engines.

Edit: While talking with Jens he said that no development was done for the 570, this model only existed in a market perspective on paper for the dev team.
Thanks Tom, Jon.

Yes you can see they are made up of mostly avail off the shelf parts.
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