Opinions or reviews on port +Polish
- Thread starter Parkersxr
- Start date
- Location
- Cape May Court House, NJ
Not a lot of guys running sxr's on here, I wouldn't expect a whole lot of responces. I have no experience with porting or ported 800's to offer
Understandable freestyle yamahas eff the world I do get it ! Lol jk
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On facebook? I can send you the link to the CWA race page, which is mainly SXR guys. If its freestyle yur after id cash in that $8k SXR and grab a nice freestyle setup, theres a RTR bob gen 2 on here for 8.
if racing they can sure help you, ive seen some of these things hit blistering speeds.
if racing they can sure help you, ive seen some of these things hit blistering speeds.
Thanks for your effort
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Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
I have limited experience with ported motors. I have a limited superjet stock motor. I have ridden ported superjets with otherwise very similar parts and did not prefer them to mine. The other superjet was done by a reputable builder and performed exactly as it was advertised, AND it was more powerrul than mine. However , i like a very linear power curve, or put another way, smooth consistant throttle response. The ported motor i am speaking of was a lot more on or off, that is, it wanted to accelerate all the time, at not cruise at one consistant speed. I would say this has to do with the tuning but one of the best tuners worked on it. It was a freestyle port job so it makes since that it hit the way it did.
It may have simply been the rider preference to have it setup this way, and i have seen poorly tuned stock motors do very similar things. I cant tell you if its worth the bang for the buck but i would emphasize that your should have good communication with the buidler about your expectations. I love the way my limited superjet is tuned and would not trade my smooth power band for more power.
As a side note, my sxr was claimed to be "mildly ported" when i purchased it. I cant verify that to be true. Its 3mph faster than my superjet with all the same parts (exceptnsxr also has filters). Superjet beats it off the line, then the sxr catches up in the mid range, which is generally how the two boats compere with each other.
Sorry i cant help more on the topic
Personally, and i know this is apples to oranges because there is a huge difference in price, but i would myself want to save for a powervalve motor. The 900pv i rode was smooth like my limited but more powerful than the ported motor, and still had more potential. Its $500 vs $3000 thouh and most people dont want the power curve i like.
It may have simply been the rider preference to have it setup this way, and i have seen poorly tuned stock motors do very similar things. I cant tell you if its worth the bang for the buck but i would emphasize that your should have good communication with the buidler about your expectations. I love the way my limited superjet is tuned and would not trade my smooth power band for more power.
As a side note, my sxr was claimed to be "mildly ported" when i purchased it. I cant verify that to be true. Its 3mph faster than my superjet with all the same parts (exceptnsxr also has filters). Superjet beats it off the line, then the sxr catches up in the mid range, which is generally how the two boats compere with each other.
Sorry i cant help more on the topic
Personally, and i know this is apples to oranges because there is a huge difference in price, but i would myself want to save for a powervalve motor. The 900pv i rode was smooth like my limited but more powerful than the ported motor, and still had more potential. Its $500 vs $3000 thouh and most people dont want the power curve i like.
- Location
- Tri-Cities, WA
Call up Art @ jetworks....he's only a few hours from you and will tell you all you want to know about porting and what he can do with your cylinder.
- Location
- South Africa
When you port a Kawi, you have to also open the flange side and header pipe, otherwise you are wasting your time.
Carbon, can you elaborate? Is that the 800's or the 750's as well?
Yea I always figured that was included in the package I shipped it all out today and while piling it off I found some bad news but good in a way . Previous owner out a hot rods crank in it and it's on the edge of being done for . Probably wouldn't have made it through this season so made some calls and probably gonna get it re done tried and welded
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- Location
- South Africa
750/800 are the same
The general rule on a 2-stroke is for the flange opening to be 10-15% bigger than exh port. A smaller flange outlet helps midrange but hurts elsewhere in powerband
Don't have numbers on-hand but as far as I can remember: at the flange Kawi stock is 42mm diameter, if you work out the area of a Yami it is equal to about 48mm diameter
A ported Kawi exh port will be equal to about 47mm, biggest I could comfortably get my flange was 46mm. Ported Yami is about 45mm at exh port, can be bigger if cylinder is bored.
The general rule on a 2-stroke is for the flange opening to be 10-15% bigger than exh port. A smaller flange outlet helps midrange but hurts elsewhere in powerband
Don't have numbers on-hand but as far as I can remember: at the flange Kawi stock is 42mm diameter, if you work out the area of a Yami it is equal to about 48mm diameter
A ported Kawi exh port will be equal to about 47mm, biggest I could comfortably get my flange was 46mm. Ported Yami is about 45mm at exh port, can be bigger if cylinder is bored.
- Location
- South Africa
No, the other side where cylinder and header go together.
That hole will have to be the same size or bigger. Better to enlarge cylinder exit, use an adapter plate and then fit a Yami exh.
That hole will have to be the same size or bigger. Better to enlarge cylinder exit, use an adapter plate and then fit a Yami exh.