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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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  #11  
Old 28th September 2018
Ridneck1986's Avatar
Ridneck1986 Ridneck1986 is offline
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Sportster/Buell Model: 883l/1200
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It's been a while since i could log on. My phone hardly works on this site.

The conversion went smooth and fired up the first time after turning it over by hand running the checks. Have not had it on the dump because of my knobbys. But it will pull strong from about 2800-6000 easy. I cruise around 3k so it stays in the power where I want it. Low speed manners are good. High speed is fine till I back off the throttle then she seems to need a little more air. May need to back off the main jet (45/180 w/mod intake with stack) but for now everything works pretty good. I will fine tune it after I get me tire.
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  #12  
Old 28th September 2018
1HD4CJM1X4K 1HD4CJM1X4K is offline
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Quote:
Originally Posted by rocketmangb View Post
Not sure about those KB pistons being forged
Looked at the same pistons and decided there was too much compression for my simple, low-power, low RPM, conversion, but yes, what he used are Forged Pistons.
Note: Using the stock cams would bring him closer to the stated 11:1 compression ratio.
By using hotter cams with more duration and overlap, the result is a lower actual compression ratio.

The KB935C is a Flat Top
11.0:1 Piston
+1cc w/883 head @ 51cc
4032 Alloy

Cannot wait to see the Dynometer Numbers with his mods..
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  #13  
Old 28th September 2018
Turbo Sporty 48 Turbo Sporty 48 is offline
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Good news!
Please keep us updated. Enjoy the ride.
Are your .551's noisy?
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  #14  
Old 28th September 2018
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Ridneck1986 Ridneck1986 is offline
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Sportster/Buell Model: 883l/1200
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Quote:
Originally Posted by Turbo Sporty 48 View Post
Good news!
Please keep us updated. Enjoy the ride.
Are your .551's noisy?
A little bit but I can't hear much with my side dump laf pipes.
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  #15  
Old 5th October 2018
jkinkade jkinkade is offline
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Good to hear it's running strong. that's the important thing.
also I think the SE 1.725 ratio rockers give a good gain for small outlay.
a few years back a friend of mine was trying different cam's in a EFI twin cam Softail 88". he started with a mild SE cam set, then changed to the next SE cam up. he has a DJ250i. the cam change made hardly any difference & for cost of Cams and the time, also time on Dyno tuning EFI, was a wait of time & $. then he put some SE 1.725 ratio Rockers, & they woke the second SE cam set up, turned into a mush better HP & TQ gain than the cam set change. but could cause valve train noise as opens and closes valves quicker.
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  #16  
Old 6th October 2018
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conv90 conv90 is offline
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Usually KB pistons eat oil.
You need (and I hope you did) to have a very big gap on top compression rings.
This big gap (info on instructions of kb pistons) it's supposed to be less or correct once the engine is in temp. But I found that this gap allow to use too much oil.
If there is no sufficient gap each ends of the ring kisses each other and the top cracks.
I had both situations on my Vette.
The first engine (a 355) was using a quart every 800-1000 miles.
the second (a 383) broke ring land on 5 pistons and I found 9 skirts on the oil pan too.
On the next engine ( a 396) i used SRP forged. 11.230 in the quartermile and perfect on the street too.
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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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