440ex bore kit?

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Dec 17, 2003 | 12:59 AM

#41

AZSAND

Extreme Pro Rider
THAT!!!!!Sounds down right sexy!

Joined: Dec 2001

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440ex bore kit?

I persoanly like the 440 and i spent 690 for the 440 big bore kit installed (no porting) and she's a monster fo sure there are cheaper kits but don't be cheap and end up with trash[img]i/expressions/face-icon-small-wink.gif[/img]

Dec 17, 2003 | 01:50 AM

#42

exrider400

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440ex bore kit?

can you have a stroked and a big bore 440ex?

Dec 17, 2003 | 03:32 PM

#43

'98RECON

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440ex bore kit?

Powroll makes a 440 bore and stroke kit. It uses an 87mm piston (normally used for 416 kits) and the crank is modified for a longer stroke (I think by 4mm). Stroking will give more power than just boring, but I think the price difference is going to be about $700 unless you split the cases to remove/install the crank by yourself.

Dec 17, 2003 | 11:15 PM

#44

440EX026

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440ex bore kit?

Quote:

Originally posted by: Dynoray
Guy's 440 cc's dosen't rev less (unless you don't have enough cylinder head) it likes to rev more. see dyno sheet in my pics. (sorry for poor quality, my scanner broke. There is a 416, two 425's and a 440(highest reving, lower power because of low compression piston and head being salvaged after a dropped valve) The difference between a 416cc and 435cc is about 5%. If every thing is right, including porting and other head work your looking at a 43rwhp bike, 5% of 43hp is 2.15hp (most head porting, stg 2 Hotcam, good complete exhaust, CDI box and 11:1 will only make 30-35hp, 5% of 30 hp is 1.5hp.
Moral of the story is, if your sleeve is still good, build a 416 or 425 as others have said.
Put your money into an R4 or Biggun complete exhaust.
Ray

OK I read that 3 times and still am not sure what you are trying to get across to us. I am thinking that an engine with head or valve problems combined with reduced compression should perform poorly, but is this your point?

I think you may also be advising to start with a 416-425 due to other mods needed and the added expense over all this of the 440. If this is right I normally agree but most people dont know what they want beyond faster than this or that guy etc. so it wount be the first time the credit card gets maxed out buying more motor than is needed.,

And I wish I could read those darn dyno results but its now your fault I am friggin blnd LOL, but the dark green runs on the first chart look pretty good to me. Which engine were they from?

Dec 19, 2003 | 10:54 PM

#45

Dynoray

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440ex bore kit?

Hey 440ex, sorry again for the dyno sheet quality, I'll have to remember to pick up a new scanner. The dark green run is a 416cc with Biggun exhaust, red is a 425cc with R4 exhaust. The light green is 440cc low comp. I put this one on because someone said a 440 didn't like to rev (over square engines will make peak power at a higher RPM). I was just showing the difference (it dosen't make as high of peak because of the low compression and not perfect head. Yellow run is the same as red but with a 41mm FCR carb.
Ray