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Discussion Starter #3
Originally posted by TrX450rKiD@May 2 2004, 06:35 PM
JE Racing also has a 12.1:1 if your interested...

http://www.sparksracing.com/center/trx450r/TRX450_engine.htm
Cool! That's more what I was looking for.

Sparks Racing piston kit standard bore 13.8:1 by JE Piston BPKH04450TRX94H $209.95
Sparks Racing piston kit standard bore 12:1 by JE Piston BPKH04450TRX94L $199.95
Honda replacement head gasket 12251-HP1-671 20.58
Honda replacement base gasket 12191-HP1-671 $7.73
Sparks Racing Aggressive "drop-in" camshaft CAMH04450TRXA $215.95
 

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450r's bore is 94mm and the compression is 10.5:1

400's bore is 85mm and the compression is 9.3:1 and is air-cooled

they are not even close
 

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Discussion Starter #8
Originally posted by fast@May 3 2004, 10:04 AM
450r's bore is 94mm and the compression is 10.5:1

400's bore is 85mm and the compression is 9.3:1 and is air-cooled

they are not even close
Man, I am smoking my socks this morning. Guess I need more coffee...

I meant CRF450 piston.

Maybe I should just delete this post and start over.
 

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if you meant crf cams, they do drop in but from what other people have posted it really isnt worth it. ask lukester he ahs one.
 

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i have the sparks 13.8:1 piston, and it isnt any less reliably. i pay 3.80 for each gallon of gas and the vibration is a little worse but its got tons more power.
 

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The most we can get at the pumps up here is 94 octane. What would you say is the safe limit for compression running this fuel?

-RR
 

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Originally posted by 04450r86250r@May 3 2004, 05:03 PM
11.75:1
12:1 you want to start running race fuel
At 11.75:1 could I run 93 octane?? That is the highest pump we have around here...just makin sure becasue someone else said they have 94 octane...
 

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can you just add octane boost or do i have to run race gas
also is torco a good gas because i can get it around here
what gas would use for the sparks 13.8:1
 

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We have 94 octane at Sunoco up here in Canada. Pioneer does 93, all the rest are 92 or under for premium. haha, you guys prolly never even heard of Sunoco or Pioneer. :lol:

-RR
 
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