CR500: What engine mods to do?

pstoffers · Post by **pstoffers** » January 29th, 2010, 1:34 pm

My 03 SH is E-4 ML3R

My 86 is E-2 ML3N

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 29th, 2010, 2:14 pm

my '86 has the original head, but its got a different # HF-1

100hp honda · Post by **100hp honda** » January 29th, 2010, 5:05 pm

whats the narrowest band used on any honda 500 head ?

powermizer · Post by **powermizer** » January 29th, 2010, 6:53 pm

I would like to know what band widths everyone has seen. Thanks

100hp honda · Post by **100hp honda** » January 29th, 2010, 7:02 pm

i checked a newer head once and it seems like 15mm. i thought it might have been 18mm but that didnt sound right, unfortunatly i dont have a loose head to re-check.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 30th, 2010, 9:10 am

heres how i measured my '86, its almost identical to the newer heads, i'll draw up more for or include casting #s for the different ones

100hp honda · Post by **100hp honda** » January 30th, 2010, 12:47 pm

blownbillybob wrote: -the close ratio trans bikes have a narrow squish with a wider, shallow pocket

you have the dimensions ?

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 30th, 2010, 3:42 pm

ml3r f-3 has about .700 sqiush compared to the .613 '86
and the pocket is 1.090 deep instead of .988
the step of this head is .080, the '86 is .040, BUT the head gasket compensates. Eitherway the factory depth of the head has no effective squish and they should be cut shallower

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 30th, 2010, 3:44 pm

there is a head off the close ratio bikes that has a narrower squish!

100hp honda · Post by **100hp honda** » January 30th, 2010, 6:00 pm

Roostius_Maximus wrote:ml3r f-3 has about .700 sqiush compared to the .613 '86
and the pocket is 1.090 deep instead of .988
the step of this head is .080, the '86 is .040, BUT the head gasket compensates.
Eitherway the factory depth of the head has no effective squish and they should be cut shallower

honda changed the heads for 2 or 3 years ? the heads you posted look nothing like a coolhead.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 31st, 2010, 8:49 am

I've been trying to do the replys by blackberry, internet at the house is in and out
I'll be posting it when i come up with the ability to load the picture
btw, there are 4 deifferent HONDA heads
Or i could just not share any of the info if you wanna get pissy about it

100hp honda · Post by **100hp honda** » January 31st, 2010, 12:14 pm

its all cool bro. i had pete make a head for me so im not too concerned with stock dimensions, i was just commenting that the numbers you posted arent even close to coolhead specs, 63cc might be the same between all of them but thats where the similarities end. the close ratio head your talking about might be closer to coolhead specs, but i havent seen that head so im not sure. dont get me wrong i think its bitchin you post info for the hoons to see

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 31st, 2010, 2:18 pm

i've got 55cc and 63cc coolhead inserts i'll compare to aswell

blownbillybob · Post by **blownbillybob** » February 1st, 2010, 7:12 am

Roostius_Maximus wrote:i have a ml3r e-4 off a SH 2003 bike
i have a ml3r F-3 that came new in the box last week
a ml3n e-2 here for a decompressor 96-98 i think
a ml3n e-1 i got from sean that was sold on ebay so who knows
all are small pocket

where are the e2-3-4 & f-3 numbers that your talking about on the head are they in a different location then the ml3-r location??? ive never looked any further then those #s

my 90 motor if it makes any diff was the ML3-N

blownbillybob · Post by **blownbillybob** » February 2nd, 2010, 7:19 am

scrap that last post

if that # was a rattlesnake it would have bit me in the thumb

94 head ML3R E-4
91 head ML3R E-3
89 head ML3N E-1

still have to check my other to heads

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » February 3rd, 2010, 6:33 am

i've ben swamped in the shop here, havent spent any time looking at the heads, but found a pic i took years ago with the different heads together, never measured them then, but i know the years of the labeled stuff, cuz it came off my own bikes

surely you can see the differences

Post by **AlisoBob** » February 3rd, 2010, 6:36 am

Roostius_Maximus wrote:i've ben swamped in the shop here

http://www.clubzone.com/c3/Canada/Strip_Clubs.html

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » February 3rd, 2010, 6:46 am

on the mount the castings are different like this...

I'll get actual pictures of the heads yet too

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » February 3rd, 2010, 6:49 am

bob, i wish

http://www.youtube.com/user/500bigbore · February 5th, 2010, 11:40 am

a better head comparison

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » February 5th, 2010, 2:38 pm

chopped together

thestuz · Post by **thestuz** » February 5th, 2010, 2:51 pm

i take it the 91+ is on the left?
what are the character differences when using these heads?
is the pre 91 for leaded petrol, a higher octane?

CR500R7 · Post by **CR500R7** » February 7th, 2010, 7:49 pm

2001 head ML3R E - 3

My 2c.

seanmx57 · Post by **seanmx57** » March 7th, 2010, 5:02 pm

OK I can see the difference, what does it boil down too?

kball1313 · Post by **kball1313** » March 11th, 2010, 9:53 am

Haha, a good friend of mine wrks @ the Cecil. Great place for women to learn to dance. Asshole gov't is shutting it down this summer too.

BannedCR500Riders.com

CR500: What engine mods to do?