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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 22nd December 2006
Gone Gone is offline
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Default Is this a good deal?

My indy said this is what he would do: new harley 1200 cylinders,
wiseco forged pistons (9.5 compression) stock cams ect. He said about 12-15
hp and about 18lbs tq. About $1250 +tax.
Anyone have any suggestions or comments?
Would sending my cylinders out to get bored and having him install them save me any $?
Just looking for some passing power and to make up for the gearing
change I did to lower revs @ highway speed. Nothing too radical.
Thanks -jp
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  #2  
Old 22nd December 2006
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Talking

These guys will bore out your 883 cylinders to 1200 for $100...
http://www.revperf.com/xl.aspx

Depending on what pistons you want to use, you can spend anywhere from $150 (possibly less) to $300. You can find JE piston sets on Ebay all day long for $200 buy it now.

Your gasket kit may be around $100 or so.

Parts total can be as little as $350, on up to thousands depending on what you want to do to it. If someone else is doing the work for you, you will probably spend more on labor than you would on parts.

The Nallin 1212 conversion is $500, and it includes everything you need for the conversion.

If you're not afraid to do your own wrenchwork, you can save yourself a heck of a lot of money. Doing the 883/1200 conversion isn't too difficult, even without a service manual. There is plenty of good info on the forum, and if you have any questions, the guys (and gals) here are always happy to help.
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  #3  
Old 22nd December 2006
c pierce c pierce is offline
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If you would rather have your indy do it that sounds about right.
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  #4  
Old 22nd December 2006
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I think that's a little high. Pistons should run you $200 to $250. Cylinder boring about $150 to $200. Top end gasket set about $89. Labor around $250
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  #5  
Old 22nd December 2006
lagerdrinker lagerdrinker is offline
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Quote:
Originally Posted by jp883
My indy said this is what he would do: new harley 1200 cylinders,
wiseco forged pistons (9.5 compression) stock cams ect. He said about 12-15
hp and about 18lbs tq. About $1250 +tax.
Anyone have any suggestions or comments?

Thanks -jp
nrhs 1250 iron kit(10:1) with se 497 cams. around 1100. for both and do it yourself. 63hp and 75ftlbs. and totally streetable. or just do 1250 kit. very high quality.
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  #6  
Old 22nd December 2006
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Quote:
Originally Posted by biknut
I think that's a little high. Pistons should run you $200 to $250. Cylinder boring about $150 to $200. Top end gasket set about $89. Labor around $250
This estimate sounds about right. My Indy will do a 9.5:1 Wiseco conversion
For around $750 to $800. I think your Indy is rippin you off.
His power estimates are way off too. Expect 50 pct more HP and 65 pct more TQ.
Your Indy is obviously not a machine shop so he wants to sell new HD 1200 Cyls
instead of boring yours out. Find an Indy who does engine work, not just bolt on
work.
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  #7  
Old 23rd December 2006
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Thanks everybody for the imput i appreciate it. I thought the price was a little high also. I mentioned the NRHS option to my dad (has worked on his 3 big-twins) He said something to the effect of we could do the job, but doing it properly takes percision that a real mechanic can provide. He was also worried about the 10:1 compression in their kit. Said he was worried about detonation. I guess I've got some thinkin' to do.
Thanks again! -jp
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  #8  
Old 23rd December 2006
rikava rikava is offline
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Yep! $1200 is high unless you like the guy and he needs the extra money. I was just given a quote here for $850
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  #9  
Old 23rd December 2006
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Quote:
Originally Posted by jp883
Thanks everybody for the imput i appreciate it. I thought the price was a little high also. I mentioned the NRHS option to my dad (has worked on his 3 big-twins) He said something to the effect of we could do the job, but doing it properly takes percision that a real mechanic can provide. He was also worried about the 10:1 compression in their kit. Said he was worried about detonation. I guess I've got some thinkin' to do.
Thanks again! -jp
Most guys on here run around 10:1, and as long as you adjust the timing as needed, and run higher octane gas as needed, there should be no problem. Some guys run 11:1 or higher, with no issues. Also, the extra compression may net you an extra couple horsepower vs the lower.

I don't understand what your father means by "doing it properly takes precision that a real mechanic can provide". It helps to have some mechanical experience, but there are dozens of people on here who have done the work themselves who are not mechanically inclined at all.

If you're willing to pay attention to detail and take the time to do it right, you should have no problem. Also, a Service Manual is a huge help. I've had my bike for years and just recently picked up a service manual. It provides an absolute wealth of knowledge and breaks down everything step by step. It was one of the best $50 I've ever spent. I've also got a Clymer manual, and the H-D Service Manual is a much better reference, since it is specifically for your bike's model and year.
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  #10  
Old 23rd December 2006
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If you're goung to spend $1,200 anyway - Get the $1,300 "Special, secret" kit from NRHS. 83 hp is sooo much better than 63. Do the work yourself...it's all bolt on stuff.
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