headwork aka port & polishing info

[RansomT]

Originally Posted by bsinclair

they have ported heads,larger cams,valvesprings,retainers,rods, over 14:1 compression pistons and a unobtainable ecu...nothing stock in those motors...

as far as brock having a happy dyno i guess the other dynojet 250's ive been on in different states is happy also as they read within a few hp of each other.

Brock's dyno has been historically 2-3 HP higher than mine on a 200 HP bike, Bob's has been double that. That's why it's always important to do a baseline.

[George Villar]

OK, I see the flow numbers…. thanks.

[Big Jay]

Originally Posted by bsinclair

i already know for a fact by decking the head and adjusting cam timing these bike pick up 10hp.

..

How will you adjust the cam timing. Does this model have oem adjustable sprockets?

[BSR-1]

Originally Posted by Rush66crp

Stupid question to follow...

What exactly would have to be sent? The entire motor? I'm not familiar with this process. Thanks.

Just the cylinder head needs shipped.
Here's an 09R1 I did for the owner of Costa Rica Yamaha a few months back.

09R1porting how to - YouTube

[bsinclair]

Originally Posted by Big Jay

How will you adjust the cam timing. Does this model have oem adjustable sprockets?

The s1000 has factory adjustable cam sprockets.

[luker669]

Originally Posted by BSR-1

Just the cylinder head needs shipped.
Here's an 09R1 I did for the owner of Costa Rica Yamaha a few months back.

09R1porting how to - YouTube

FYI this isn't the same guy who started this thread !!


Sent from my iPhone using Motorcycle.com App

[BSR-1]

Originally Posted by luker669

FYI this isn't the same guy who started this thread !!


Sent from my iPhone using Motorcycle.com App

Correct.
I was just answering the question by showing the piece involved and a little bit of how it's done.

[Big Jay]

Originally Posted by bsinclair

The s1000 has factory adjustable cam sprockets.

I figured there had to be a reason we had not made those.

[bsinclair]

thought i would give a update with pictures...





this is a quote from my freind that did a little write up for his business website...

Ive been working on this one for awhile now trying to improve on an out of the box impressive design . BMW did thier homework ! Without damaging the velocity Ive managed to increase airflow in this head by as much as 19% near max lift (the smallest gain being 7% at .1-.15 lift . The BMW cam profile and rocker design is simply genious enabling them to hold the valve open at max lift far longer than any of the japanese profiles .
After much time and thought (you cant imagine what goes into a port development for those that actually develop thier own and dont just steal others) I am excited to unviel this one . We should have dyno results within the next couple of weeks .

[russianvr4]

Really long forward to dyno results on this. I hope you're not doing any other mods at the same time so we can have a good comparison.