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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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  #1  
Old 9th January 2019
t120r t120r is offline
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Default Big Bore '03 883R :)

So I pulled the trigger and ordered the 90cid kit from Hammer. Picked up a set of XB heads as well locally. My previous 1200 with Edelbrock heads ran well, but I wasn't happy with it. This should help.

I'm going to machine the cases myself on my Bridgeport. The heads will be shipped to Hammer for their magic.

I'm only concerned with pulling torque as I'm 235lbs and want to run my 30 tooth pulley, So right now the plan is:

90cid with 30 degree pistons
XB Heads with Impact port work and chamber machining
S&S Super E
HardKrome 2-Into-1 Accelerator exhaust
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  #2  
Old 9th January 2019
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rejeanprimeau rejeanprimeau is offline
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And a clutch upgrade. LOL
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  #3  
Old 9th January 2019
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Nibelungen Nibelungen is offline
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Default

Previous experiences of members suggest also a stronger Buell crankshaft and flywheel... and a bronze oil pump drive gear... all detailed on Hammer's site...

according to me an oil cooler would be welcome as well
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  #4  
Old 10th January 2019
t120r t120r is offline
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Quote:
Originally Posted by rejeanprimeau View Post
And a clutch upgrade. LOL
The clutch will come soon as I start slipping it.
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  #5  
Old 10th January 2019
jkinkade jkinkade is offline
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Quote:
Originally Posted by t120r View Post
So I pulled the trigger and ordered the 90cid kit from Hammer. Picked up a set of XB heads as well locally. My previous 1200 with Edelbrock heads ran well, but I wasn't happy with it. This should help.

I'm going to machine the cases myself on my Bridgeport. The heads will be shipped to Hammer for their magic.

I'm only concerned with pulling torque as I'm 235lbs and want to run my 30 tooth pulley, So right now the plan is:

90cid with 30 degree pistons
XB Heads with Impact port work and chamber machining
S&S Super E
HardKrome 2-Into-1 Accelerator exhaust
sounds like you will have fun!!

I've got an 88" have only ridden it 3,500 mile since making it 88", I don't ride hard & the SE 9 plate clutch with stock pressure plate working for me so far.
I have Hammer billet manifold Hammer Billit 3" air cleaner Woods 43.5 Rebel Carb Hammer Impact 560 s&s premium lifters Hammer push rods Twin Tech ignition. just have Chrome work tappered end Duel's ( baffles look restrictive. but all I had to use. I have only reved it to 5,500, it was pulling strong, it is nice to ride and am surprised how smooth as rigid mount. I have not had it on a dyno so can't say what HP it makes , just I love riding it, as nice to ride. in about one month I'll take it to Sydney Dragway to see what trap speed it does, not worried about ET just going to check speed to work out what HP is.
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  #6  
Old 10th January 2019
t120r t120r is offline
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Quote:
Originally Posted by Nibelungen View Post
Previous experiences of members suggest also a stronger Buell crankshaft and flywheel... and a bronze oil pump drive gear... all detailed on Hammer's site...

according to me an oil cooler would be welcome as well
I seriously doubt I need to swap out the flywheels for a street bike. I'll rarely hit 5000rpm.

The bronze oil pump gear is a good idea.

I live in Canada... I don't think overheating will be a concern. At least not for me to buy an oil cooler.
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  #7  
Old 10th January 2019
t120r t120r is offline
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Quote:
Originally Posted by jkinkade View Post
sounds like you will have fun!!

I've got an 88" have only ridden it 3,500 mile since making it 88", I don't ride hard & the SE 9 plate clutch with stock pressure plate working for me so far.
I have Hammer billet manifold Hammer Billit 3" air cleaner Woods 43.5 Rebel Carb Hammer Impact 560 s&s premium lifters Hammer push rods Twin Tech ignition. just have Chrome work tappered end Duel's ( baffles look restrictive. but all I had to use. I have only reved it to 5,500, it was pulling strong, it is nice to ride and am surprised how smooth as rigid mount. I have not had it on a dyno so can't say what HP it makes , just I love riding it, as nice to ride. in about one month I'll take it to Sydney Dragway to see what trap speed it does, not worried about ET just going to check speed to work out what HP is.
Sounds like you have a fun toy. I hope to be riding this spring. A lot of work to go yet though.
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  #8  
Old 10th January 2019
jkinkade jkinkade is offline
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Originally Posted by t120r View Post
Sounds like you have a fun toy. I hope to be riding this spring. A lot of work to go yet though.

also I forgot to mention I got the Bronze oil pump gear from Hammer, my heads are late EFI has larger intake valves but stock exhaust size & beehive aftermarket springs set up for 650 lift so springs last longer ( I hope ) & pistons are flat top's
I still have the stock 03 flywheels, I wanted a guy here in Australia to do my flywheels but he only just passed away ( big loss!! ) but got aGuy also in Australia to press flywheels apart , crank pin & bearings came out like new, but big end of rods were like an egg, he resized rods changed balance factor from 60% to low 50%?? ( think about 52% and trued & welded pin. I have been very surprised how smooth motor is, it is smoother than it was stock.
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  #9  
Old 12th January 2019
t120r t120r is offline
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Quote:
Originally Posted by jkinkade View Post
also I forgot to mention I got the Bronze oil pump gear from Hammer, my heads are late EFI has larger intake valves but stock exhaust size & beehive aftermarket springs set up for 650 lift so springs last longer ( I hope ) & pistons are flat top's
I still have the stock 03 flywheels, I wanted a guy here in Australia to do my flywheels but he only just passed away ( big loss!! ) but got aGuy also in Australia to press flywheels apart , crank pin & bearings came out like new, but big end of rods were like an egg, he resized rods changed balance factor from 60% to low 50%?? ( think about 52% and trued & welded pin. I have been very surprised how smooth motor is, it is smoother than it was stock.
I'm lucky that Heavy Duty Cycles is relatively close to me and they do balancing. If there's anyone else nearby that does crank work, I'll have to search them out.
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Old 12th January 2019
jkinkade jkinkade is offline
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Quote:
Originally Posted by t120r View Post
I'm lucky that Heavy Duty Cycles is relatively close to me and they do balancing. If there's anyone else nearby that does crank work, I'll have to search them out.
Have to check with them if they are set up to do the pressed in crank pin. your crank will be like mine. I like the pressed pin as bit stronger than the old style tappered pin that bolted together.
I had my first Harley crank dynamically balanced back in 1980. it was a big twin shovel had S&S big bore barrels & Stroker flywheels 3 5/8" bore 4 3/4" stroke, changed balance factor to 52%, it was not as smooth as this 3 13/16" bore 3 13/16" stroke XB heads sporty. but it is still going sold to a friend & still rides it long distance. I did quarter mile in 11.6 seconds speed was 115mph, that was as I road on street & kick start only. the guy who balanced my sporty went to lot of trouble & kept as much weight in the flywheels as he could, as I told him it's mostly for street but I'll take it down the standing quarter once in while.

it is quick out the hole off the lights & pulls smooth & strong, but as said have not reved motor past 5,500 too many police & enforce the speed limit. but will test it at the track soon probably only rev to 6,000 & sort shift 5,500.
not important to me just want to check what speed in quarter, to see if I need to tune.
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