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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #1541  
Old 11th September 2018
MatHormell's Avatar
MatHormell MatHormell is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Jul 2015
Location: Merica!Fock YA!
Posts: 1,243
Sportster/Buell Model: XL883R
Sportster/Buell Year: 2002
Sportster/Buell Model #2: Buell XB12R
Sportster/Buell Year #2: 2009
Other Motorcycle Model: Yamaha
Other Motorcycle Year: 95
Reputation: 958932
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Great day at the track! New PB and first win!

Sent from my SAMSUNG-SM-G890A using Tapatalk
__________________
HAMMER PERFORMANCE 90 Ci
CP .500 Dome Pistons
Axtel Cast Iron Cylinders
HAMMER PERFORMANCE .600 Cams
1.725 Ratio S&S Rocker Arms
HAMMER PERFORMANCE Intake Manifold
HSR 48 Miunki
XR1200 Crank Conversion W/ Case Mod 34T
HAMMER PERFORMANCE Sledge+ Head Work
2.020" Intake and 1.630" Exhaust Valves
Conical Valve Springs
S&S Premium Lifters
HAMMER PERFORMANCE Billet Push Rod Bases
Barnett Clutch Hub With Scorpion Clutch
Dynatek 2000i
R&D MOTORSPORTS- TRANSMISSION WORK-REM ISF
WorldWideBearings
Patriot Defender Exhaust
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  #1542  
Old 11th September 2018
MatHormell's Avatar
MatHormell MatHormell is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Jul 2015
Location: Merica!Fock YA!
Posts: 1,243
Sportster/Buell Model: XL883R
Sportster/Buell Year: 2002
Sportster/Buell Model #2: Buell XB12R
Sportster/Buell Year #2: 2009
Other Motorcycle Model: Yamaha
Other Motorcycle Year: 95
Reputation: 958932
MatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond repute
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10.07 pass on the helmet cam.

https://youtu.be/vX4kporWyXA


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  #1543  
Old 2 Weeks Ago
MatHormell's Avatar
MatHormell MatHormell is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Jul 2015
Location: Merica!Fock YA!
Posts: 1,243
Sportster/Buell Model: XL883R
Sportster/Buell Year: 2002
Sportster/Buell Model #2: Buell XB12R
Sportster/Buell Year #2: 2009
Other Motorcycle Model: Yamaha
Other Motorcycle Year: 95
Reputation: 958932
MatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond repute
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Made a few recent changes

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  #1544  
Old 2 Weeks Ago
jkinkade jkinkade is offline
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Join Date: Jan 2016
Location: on the Australian east coast
Posts: 502
Sportster/Buell Model: XLH 1200 2003
Sportster/Buell Year: 2003
Reputation: 41905
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Hi Mat,
Wow you will need a wheelie bar!
will be good to see what time's you do with the bottle!! & how it handles the extra HP + TQ at track. how much of a shot will you give it? & will the Mik 48 give enough extra fuel?
__________________
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  #1545  
Old 2 Weeks Ago
MatHormell's Avatar
MatHormell MatHormell is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Jul 2015
Location: Merica!Fock YA!
Posts: 1,243
Sportster/Buell Model: XL883R
Sportster/Buell Year: 2002
Sportster/Buell Model #2: Buell XB12R
Sportster/Buell Year #2: 2009
Other Motorcycle Model: Yamaha
Other Motorcycle Year: 95
Reputation: 958932
MatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond repute
Default

No bar life!!!

No nitrous here yet, may end up adding a small bottle in good time to keep up with all these stretched zx14s around here on nitrous lol.

Ran by new PB in the 1/8 last night with the new stack and boyesen Xwing.
Looking at my best 1/4 slip. This 1/8 would of been a 9.9 run had I been on the 1/4. Improvemnts are being made!


Wanted to product review the Xwing also..

Last night was the first start and runs using it along with a velocity stack, in place of the hammer performance backing plate ran open.

So here is what I noticed right off the first start.

A far smoother and more consistent idle. My bike has never idled so good before. It was low 70s all night, no choke, started everytime, no fluctuations in idle or carb pops and the most consistent smooth AFR its has had yet holding steady at 13.1.

Secondly the throttle response. It's hard to beat a Mikuni HSR and its throttle responsiveness. I actually prefer the HSR over most all Harley injection as far as throttle response goes. Well it got better, alot better. When staging it held high rpm much more steadily and the slightest wack of the throttle was instantly turned to revs.

I haven't had it on the street yet, but can only assume the same characteristics will apply in part and mid throttles.

Top end didn't loose any and pulled my new personal best of 6.36 seconds in the 1/8, so it for sure isnt taking anything away from the big end. The AFR has never been so smooth and flat, mind you, I've spent extended periods of time in the dyno trying to perfect its AFR line.

For less than $100 I do not regret the purchase what so ever. I know my motor very well and how it behaves. Its very consistent and dialed into me and I can say without a doubt the Boyesen Xwing made an improvement across the powerband and worth the purchase.

So its staying in.

Was having trouble with the wego getting to to log RPM perfectly, think I need a better connection at the coil.



Quote:
Originally Posted by jkinkade View Post
Hi Mat,
Wow you will need a wheelie bar!
will be good to see what time's you do with the bottle!! & how it handles the extra HP + TQ at track. how much of a shot will you give it? & will the Mik 48 give enough extra fuel?


Sent from my SAMSUNG-SM-G890A using Tapatalk
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  #1546  
Old 2 Weeks Ago
jkinkade jkinkade is offline
Chief Harley Engineer
 
Join Date: Jan 2016
Location: on the Australian east coast
Posts: 502
Sportster/Buell Model: XLH 1200 2003
Sportster/Buell Year: 2003
Reputation: 41905
jkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to beholdjkinkade is a splendid one to behold
Default

Quote:
Originally Posted by MatHormell View Post
No bar life!!!

No nitrous here yet, may end up adding a small bottle in good time to keep up with all these stretched zx14s around here on nitrous lol.

Ran by new PB in the 1/8 last night with the new stack and boyesen Xwing.
Looking at my best 1/4 slip. This 1/8 would of been a 9.9 run had I been on the 1/4. Improvemnts are being made!


Wanted to product review the Xwing also..

Last night was the first start and runs using it along with a velocity stack, in place of the hammer performance backing plate ran open.

So here is what I noticed right off the first start.

A far smoother and more consistent idle. My bike has never idled so good before. It was low 70s all night, no choke, started everytime, no fluctuations in idle or carb pops and the most consistent smooth AFR its has had yet holding steady at 13.1.

Secondly the throttle response. It's hard to beat a Mikuni HSR and its throttle responsiveness. I actually prefer the HSR over most all Harley injection as far as throttle response goes. Well it got better, alot better. When staging it held high rpm much more steadily and the slightest wack of the throttle was instantly turned to revs.

I haven't had it on the street yet, but can only assume the same characteristics will apply in part and mid throttles.

Top end didn't loose any and pulled my new personal best of 6.36 seconds in the 1/8, so it for sure isnt taking anything away from the big end. The AFR has never been so smooth and flat, mind you, I've spent extended periods of time in the dyno trying to perfect its AFR line.

For less than $100 I do not regret the purchase what so ever. I know my motor very well and how it behaves. Its very consistent and dialed into me and I can say without a doubt the Boyesen Xwing made an improvement across the powerband and worth the purchase.

So its staying in.

Was having trouble with the wego getting to to log RPM perfectly, think I need a better connection at the coil.





Sent from my SAMSUNG-SM-G890A using Tapatalk
Sounds positive!
can't wait to see a time slip thats in the nines and a trap speed in the 130's!

as they say get 60' down & if you don't make any mistakes the ET will drop!
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