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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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  #31  
Old 23rd October 2018
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splineman splineman is offline
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I think the steering damper is a good idea.
The rigid is probably the sporty to have for handling but I've got this one and really like it so will keep at it haha.
I have a Triumph Street Twin as well, handles well, good brakes EFI etc....but man I love my 90", may sell the Triumph....not a touch on the Harley overall lol. Mates think I'm crazy.
Even Mrs splineman loves the sporty.

Yeah I agree on the belt....chains a major pita, I hate them. Always fussing and farting around with them.

Cheers.



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  #32  
Old 23rd October 2018
jkinkade jkinkade is offline
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Quote:
Originally Posted by splineman View Post
I think the steering damper is a good idea.
The rigid is probably the sporty to have for handling but I've got this one and really like it so will keep at it haha.
I have a Triumph Street Twin as well, handles well, good brakes EFI etc....but man I love my 90", may sell the Triumph....not a touch on the Harley overall lol. Mates think I'm crazy.
Even Mrs splineman loves the sporty.

Yeah I agree on the belt....chains a major pita, I hate them. Always fussing and farting around with them.

Cheers.



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if I had a rubber mount sporty I would make up a forward to rear stabiliser bar, my Buell is a rubber mount and I fitted one to that. big difference to feel.
I'll keep the belt drive as a bit smoother and I will be riding it a lot.

my friends some of them, think the same but they ride mass production, boring bikes.
I'll be interested to see what trap speed I can do at quarter mile drags, as they tells me power to weight I have. if high trap speed & slow ET just look at 60 foot time, a slow ET & High trap speed will show a slow 60 foot so it's the rider not the bike.

I'll let you know how she feels
.
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  #33  
Old 23rd October 2018
jkinkade jkinkade is offline
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Originally Posted by conv90 View Post
Always asking myself how you dragracers can avoid to loop yourself once you are WOT. My bike wants to loops in 1st and 2nd too. In 3rd it wants to lift the front only. long swingarm like Matt is ok or wheely bar OK, but in the street is a real problem.
I said loop and not wheelie because the front lifts in a abrupt way where the only action I can to is to close the throttle.

jkinkade the bike sound goood! Nothing beats the 2 in to 2 exaust sound.
conv90 you have a strong runner for sure! the STD heads can no longer buy and always what racer's used. they are good heads. and Red shift cams always work well!! I wanted the Red Shift 630/585 & if was in stock I would have them. but needed to send a cam set to have the lobes fitted. also Aron pointed out with the high lift would need to use Jim's lifters. I got the S&S Premium Lifters. Aron advised I use the 600 hammer because of motor size. but I went with the 560 impact Hammer cam set as I liked the look of how Sporty Traceys Build turned out with those cam's. but not expecting mine to make same HP & TQ, but I'm not worried as would be hard to ride at the track with stock wheel base like you mention, your bike wants to loop when you give it WOT. that happens!!
some people think it would be fun, but it makes it harder to ride fast.

I have stock size wheels & 130 . 90 X 16" rear tire , I've always had that size on all my Harleys at the rear ( heavy old tire, but at the track that has track preparation & on a hot day , I have run 40 p s I tire pressure and had my bikes wheel stand out the hole. I would love some rims like yours!!
just want the bike to look stock, or close to it.

how's your bike since you found the intake manifold loose? have you fixed it & has it stopped the detonation?
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  #34  
Old 23rd October 2018
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Originally Posted by jkinkade View Post
conv90 you have a strong runner for sure! the STD heads can no longer buy and always what racer's used. they are good heads. and Red shift cams always work well!! I wanted the Red Shift 630/585 & if was in stock I would have them. but needed to send a cam set to have the lobes fitted. also Aron pointed out with the high lift would need to use Jim's lifters. I got the S&S Premium Lifters. Aron advised I use the 600 hammer because of motor size. but I went with the 560 impact Hammer cam set as I liked the look of how Sporty Traceys Build turned out with those cam's. but not expecting mine to make same HP & TQ, but I'm not worried as would be hard to ride at the track with stock wheel base like you mention, your bike wants to loop when you give it WOT. that happens!!
some people think it would be fun, but it makes it harder to ride fast.

I have stock size wheels & 130 . 90 X 16" rear tire , I've always had that size on all my Harleys at the rear ( heavy old tire, but at the track that has track preparation & on a hot day , I have run 40 p s I tire pressure and had my bikes wheel stand out the hole. I would love some rims like yours!!
just want the bike to look stock, or close to it.

how's your bike since you found the intake manifold loose? have you fixed it & has it stopped the detonation?
Not yet fully tested because I'm working from home these days and I'm using the bike only for few kilometers.
About shocks I'm happy with my YSS rear shoks and the Paioli mid glide 46mm front forks.
Me too Id like to raise just a bit the rear. Is this a solution?
https://www.hughshandbuilt.com/produ...eringlift-kit/
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1990 Sportster Axtell 90 ci, CP Carrillo 3.875 30° deg pistons,STD Heads, 615V2 RedShift cams, HSR48,
Carrillo 9.638 rods
Hammer Billet Sledge air filter
Hammer Billet Manifold.
160/60ZR17 rear on Akront 4.25" Alu rim
100/90-19 front on Akront 2.50" new Alu rim
YSS 13.75 rear shocks
1975 XLH almost stock
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  #35  
Old 23rd October 2018
jkinkade jkinkade is offline
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Quote:
Originally Posted by conv90 View Post
Not yet fully tested because I'm working from home these days and I'm using the bike only for few kilometers.
About shocks I'm happy with my YSS rear shoks and the Paioli mid glide 46mm front forks.
Me too Id like to raise just a bit the rear. Is this a solution?
https://www.hughshandbuilt.com/produ...eringlift-kit/
The link to the swingarm, that uses a moveable swingarm to shock mount. I have seen that idea used before. but I don't think I would trust it. also the guy that rebuild my shocks said , he does not like short shocks he see's on Harleys, as the swingarm is at wrong angle to work properly. I'm not an expert so no experience in testing or designing. this guy does a lot of testing. but lowering the bike better for Drag's. he was talking about riding fast over rough twisty roads & getting a controlled ride. If you can understand what I mean.
Like on a drag strip it should be smooth & straight & flat, so ground clearance not away's a issue. If your riding fast & your frame hits the ground hard, your in trouble!
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  #36  
Old 24th October 2018
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splineman splineman is offline
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"If your riding fast & your frame hits the ground hard, your in trouble!"

Yup absolutely..... Had this happen too often. Left bends peg feelers are first to touch but right turns it's the exhaust crossover, if suspension under load quite hard.
Of course the solution is longer shocks and personally that would be my choice.
There are some quite good and reasonably priced shock out there nowadays....don't need big bucks Ohlins, just my view.
Not sure on changing the shock mount point, not something I would do without careful thought.

What I like about the 90" is the fantastic drive out of bends....I just corner sensibly and use what I've got for that great midrange drive.....love it.

Cheers

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  #37  
Old 24th October 2018
jkinkade jkinkade is offline
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Quote:
Originally Posted by splineman View Post
"If your riding fast & your frame hits the ground hard, your in trouble!"

Yup absolutely..... Had this happen too often. Left bends peg feelers are first to touch but right turns it's the exhaust crossover, if suspension under load quite hard.
Of course the solution is longer shocks and personally that would be my choice.
There are some quite good and reasonably priced shock out there nowadays....don't need big bucks Ohlins, just my view.
Not sure on changing the shock mount point, not something I would do without careful thought.

What I like about the 90" is the fantastic drive out of bends....I just corner sensibly and use what I've got for that great midrange drive.....love it.

Cheers

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that drive out the bends!!!!
that's what I want thrust!!
does it feel light in the front when you drive hard out the bends?

I remember back in the 1990's going to watch roaring sporty's or twin sports ( had few different names ) Harley sponsored the class. they had a 2 into 1 system that had good clearance & mounted to top shock mount, and the ones I saw used 15" long shocks, and they were putting there knee's down in corners.
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  #38  
Old 24th October 2018
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splineman splineman is offline
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Yeah it's definitely light on the front on an agressive throttle.....I'm no Casey Stoner tho lol....ride sensibly at my age lol.
I'm no drag racer!
You'll love your bike I'm sure!!

Cheers

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  #39  
Old 24th October 2018
jkinkade jkinkade is offline
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Quote:
Originally Posted by splineman View Post
Yeah it's definitely light on the front on an agressive throttle.....I'm no Casey Stoner tho lol....ride sensibly at my age lol.
I'm no drag racer!
You'll love your bike I'm sure!!

Cheers

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thanks what heads are you using ? & what size valves? also do you know what comp ratio you have?
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  #40  
Old 24th October 2018
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splineman splineman is offline
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I bought a set of machined heads from Hammer...with the crush head porting service 1.9" intake 1.615" exhaust valves.
https://www.1250kits.com/xlporting.shtml#Crush
10.5 compression, 205 lb cranking pressure best I can check.
It's strong no doubt about that!

Cheers.

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