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took the head off and dropped the gasket on the floor. which was is up. waterjacket is dimpled so does it go up or down? also are you guys using the stock throttle cable with your pwk's. also checked the number on the piston. 636m09050 so i guess it's 1.5mm over making it a 90.50 what oversize is this and how many oversizes are there. thanks

if its really 1.5 over its time for a new jug..

shit are you serious? thats the part number on the head of the piston. it was just rebuilt so its super clean. why do you say its time for a new jug? yep just checked with a mic. 90.5 thats inside the jug

90.5 is the largest the cylinder can go.. if it looks good inside run it.. but when it comes time for a top end then your gonna need a new cylinder or a new sleeve..

ISBB wrote:... your gonna need a new cylinder or a new sleeve..

Or plate it .....

If I'm not mistaken, there is 2 more bores... the 636 series of wisecos (or maybe it's pro-x) go in 1/4 mil increments... should be able to get a 90.75 and a 91. Right?

edit: The increments for wiseco is 89.00, 89.25, 89.50, 89.75, 90.00, 90.50, and 91.00

yeah there is one more size acording to weisco. so when do you know when to go oversize and when do you change your piston?

there is one more bore left, 91mm. they go in .5mm incriments.

i was always told 91.5 was the biggest one should go but hey im no motor builder...

ISBB wrote:i was always told 91.5 was the biggest one should go but hey im no motor builder...

dont you mean 90.5 you guys are like the yoda of cr500's lol

sorry 90.5 dislexia at its best..

fastkart wrote:If I'm not mistaken, there is 2 more bores... the 636 series of wisecos (or maybe it's pro-x) go in .25 mil increments... should be able to get a 90.75 and a 91. Right?

edit: The increments for wiseco is 89.00, 89.25, 89.50, 89.75, 90.00, 90.50, and 91.00

This is the correct answer. However I think there is a 90.25 and 90.75 availible per Wiseco.

And you have to find a good shop to measure the cylinder to piston wall clearance to be sure if its time to bore unless the compression is low. .005 is max.

Here is a look at the CR500 section in Wiseco's catalog.



Here's their dirtbike catalog... CR500 stuff is at the bottom of page 5.

http://www.wiseco.com/PDFs/Catalogs/CB0 ... leDirt.pdf

what about the head gasket and throttle cable question? also about how much hp can you get out of a naturaly aspriated motor?

Dimples do go up, tab towards the back. I use an OEM Honda cable with my PWK. As far as power, I think some people are saying 80ish... not 100% sure though.

At least a 100 hp, easy......

100 hp really? with out no2 and all that jazz. and if 100hp is obtainable then how. other than post and polish, hi comp piston what else

aloha450x wrote:100 hp really?

haha got jokes. lol so thats a no i take it damm bob i love and hate you

I would say a max of around 65 horse without having to run race gas.

Want about running race gas? Say 100 octane for the street?

You dont wanna have to run race gas all the time especially on the street. It gets expensive fast, every time I take the GSS bike out it costs me about $65 for 5 gal with oil.

costs me $30w/ oil cuz the 100 octane is $4.99/gal by my house!

well the price of pump gas is is 3.60 for screw it. I always ran race gas on the street in my 450x. its only a weekend hell raiser. the funny part is that I ride a bicycle to work. haha I guess it 2 wheels. so I will spend stupid amounts on my cr.

britincali wrote:You dont wanna have to run race gas all the time especially on the street. It gets expensive fast, every time I take the GSS bike out it costs me about $65 for 5 gal with oil.

where in the hell are you getting your race gas?? im right at 6 bucks a gallon so it costs me half as much! OHh ya forgot to mention the stuff i get is right out of the pump.. if you get it in the can your gettin reamed.