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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 14th March 2005
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Default 2004 88 inch question!?!?!?!?

I'm getting ready to gather the parts I need for a Nallins' 88 inch conversion of my 2004 Roadster, starting with the basic kit (cylinders, pistons).

I'd like to know which parts will carry over from the stock engine and which I need to replace (i.e. pushrods, valves/guides, lifters, yadayadayada...)

I am more interested in low-end torque over hi-RPM horsepower, FWIW.

Thanks in advance -
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  #2  
Old 14th March 2005
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See the following thread...I think most will still apply to the 04 bikes:
88 inch shopping list help
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  #3  
Old 14th March 2005
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Default Thanks...

I'd read (and posted) in that thread but still had some questions.

For some reason it seems like I heard somewhere that the 2004 and up heads are good to use as-is, but I can;t find any info like that again.

Also heard (I think) that some other stock 2004 parts are good as-is in the 88" setup.

Of course, new cams are a gimme.

I like my stock keihin carb, but I guess that's gotta go too.

I guess what I am looking for is a piece-by-piece shopping list SPECIFIC to the rubbermount engine, with emphasis on what parts can be reused. I want to make sure I do it right, but I don't want to spend too much of my sons college fund either!
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  #4  
Old 15th March 2005
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You can use your heads "as is" but I wouldn't ... you're putting a LOT of money down to go 88" and you aren't gonna get what it's capable of with stock heads...

The stock CV is also gonna be a bottleneck .... so a 44CV or a 42 -45 mikuni (depending on cam size and intended rev limit)

If you email NRHS and tell them what you have and what you want then I'm sure Aaron or Justin will email you back a list of their recomendations
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Old 15th March 2005
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Quote:
Originally Posted by stevo

The stock CV is also gonna be a bottleneck .... so a 44CV or a 42 -45 mikuni (depending on cam size and intended rev limit)

Hey stevo, wouldn't the cv give him great throttle response down low where he wants it? Also it's good to 100 hp or so too. Just a thought. He could sink the 400 from the carb into the heads or cams?
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  #6  
Old 15th March 2005
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Even if someone says they want low end torque... they're most likely gonna crack it up the top every now and again...the 40 WILL be a bottleneck to much over 100HP..
now if he runs mild cams and never revs it past 5500 then ya don't need any more than a 40CV

Carbs are a compromise....

I've found if you have a very well put together motor and a well tuned Mikuni it becomes hard to ride smoothly as the throttle response is VERY sharp...

A cv softens the power delivery a touch and makes it easier to ride relaxed...

It comes down to personal choice......I'm gonna be runnin the 40CV on mine to start with untill it's fully run in and I start chasin HP numbers....

I have customers with mildy worked 95" twinkies runnin 40cv's with no probs....
I've even got one that we took the Mikuni off and put a 40CV back on and it made no difference to max power output BUT made ther bike sooo much easier to ride.
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Old 17th March 2005
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soft n sluggish....
STOP TALKIN BOUT STEVO LIKE THAT!







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Old 18th March 2005
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Quote:
Originally Posted by Narley
soft n sluggish....
STOP TALKIN BOUT STEVO LIKE THAT!








C'mon Narley ..... I'm sharper than a wet towel....
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