500xc crankshaft in a wr430 crank

[wr4301981]

Is it possible to take a crankshaft from a water cooled 500 cc engine from 1986 and put in an air cooled wr 430 from 1981?
If it fits, can I use the 430 cylinder with longer boults and a spacer underneat?
How bout the port times and pipe?
Worth doing to get a brutal machine or just waste of time?

 

[2premo]

Is it possible to take a crankshaft from a water cooled 500 cc engine from 1986 and put in an air cooled wr 430 from 1981?
If it fits, can I use the 430 cylinder with longer boults and a spacer underneat?
How bout the port times and pipe?
Worth doing to get a brutal machine or just waste of time?

you brought up the biggie, port timing
the 430 and 500 share a bore, but the stroke is the port and exhaust difference
by the time you modified a 430 cylinder it would pretty much be a 500 cylinder

 

[Michel Dufayard]

Why not find a 500 cylinder and head ?

A thread about the 470 pro-circuit.
http://www.cafehusky.com/threads/470-pro-circuit.36840/

 

[wr4301981]

Ok. But do the crankshaft fit the case? And with 500 cc cylinder and piston it's boult on?

 

[justintendo]

Is it possible to take a crankshaft from a water cooled 500 cc engine from 1986 and put in an air cooled wr 430 from 1981?
If it fits, can I use the 430 cylinder with longer boults and a spacer underneat?
How bout the port times and pipe?
Worth doing to get a brutal machine or just waste of time?

waste of time for sure...
the 430 can be mildly ported, jetted, and tweaked to be a rocket unto itself....
if thats not enough, get a 500 crank, rod, piston and jug and use it in the big bore cases...no point in trying some combination of the 2..

 

[fran...k.]

Is it possible to take a crankshaft from a water cooled 500 cc engine from 1986 and put in an air cooled wr 430 {Insert engine cases here}from 1981?

Yes

[quote="wr4301981, post: 552345, member: 60658"If it fits, can I use the 430 cylinder with longer boults and a spacer underneat?
How bout the port times and pipe?
Worth doing to get a brutal machine or just waste of time?[/quote]



I believe the cylinder studs are the same the head bolts are longer from the shoulder down. That would be with a 500 cylinder and head. The 81 wr430 should have the primary drive associated with the six speed in the 500 models. The stroke difference is 10 mm so I will guess the exhaust spigot is around 7mm higher check how close to the tank the pipe is.

 

[Joe Chod]

uh....guys....water cooler left crank snub is longer to run the water pump gear.....wont align with non water cooled crank primary gear

 

[fran...k.]

The threads on the drive snub/stub have a slot in their cylindrical volume. The water pump drive flat thing kind of goes inside the nut that holds the tapered primary gear on. You may be right however I would have to measure the difference myself. I wore out the starter gears on an 83xc500, put the clutch and starter gears from an 86 in that. Then when that crank wore out I changed the cylinder studs of another 85 or 86 to accomidate the air cooled top end and put the clutch and starter gerar on that engine lower end. Used the 83 clutch cover (which I think needs retired by now) I always used the gear that was on the crank. The primary gears lined up fine.

 

[justintendo]

uh....guys....water cooler left crank snub is longer to run the water pump gear.....wont align with non water cooled crank primary gear

the stubs are the same, the threaded section on the liquids are just a tad longer for the drive slot but the stub section is the same...ive run liquid cranks in air cooled bottoms, crank gear lines up perfect.

 

[Joe Chod]

my bad....i was thinking 125 for some reason. water cooled and primary drive were both introduced same year (84)
wc 125 will not go into AC 125