Well it's time to rebulid the race bike and I was wondering if any of you gents have put in 1000 cams into a 600cc platform. I am expecting some midrange loss but figure the top end will be excellent. I am also concerned with valve and spring fatiguge as the lift is much higher. Will be fun timing the cams to get the clearances I need. If you know of anyone who has done this I have some Q's for them.

They will go in and with space as the lift and duration are not much more. They are very close spec to a lot of the hot 600 profiles anyway although the 1000 exhaust cam has a bit too much duration i'd say for this motor. I've built a lot of 600 motors with cams these spec and they go very well, but you will need good compression to make them work. Check clearances carefully on the dry build if you plan on taking much off the barrels and head. Squish can run pretty tight on these but not as much as they earlier 600's.

The BIG PROBLEM is going to be valve springs. The stock springs won't be too good with these cams and check carefully for coil bind. Also, the titanium valves won't last if you go and fit the white or yellow springs which are both good for the lift and ramp profile. The seat pressures will also be out with these. I'd guarantee the inlet valves give you no more than 150 miles with these springs and stock seat material. If you change away from titanium then this won't be a problem.

Increasing the rev limit is also good on the motors when tuned like this, but it only accelerates the stock valve issue. You'll be looking at around 130bhp at the wheel when its all done though.

Best of luck with it and i hope someone that knows the solution is prepared to share it. Most likely you'll have to pay for that knowledge.

They will go in and with space as the lift and duration are not much more. They are very close spec to a lot of the hot 600 profiles anyway although the 1000 exhaust cam has a bit too much duration i'd say for this motor. I've built a lot of 600 motors with cams these spec and they go very well, but you will need good compression to make them work. Check clearances carefully on the dry build if you plan on taking much off the barrels and head. Squish can run pretty tight on these but not as much as they earlier 600's.

The BIG PROBLEM is going to be valve springs. The stock springs won't be too good with these cams and check carefully for coil bind. Also, the titanium valves won't last if you go and fit the white or yellow springs which are both good for the lift and ramp profile. The seat pressures will also be out with these. I'd guarantee the inlet valves give you no more than 150 miles with these springs and stock seat material. If you change away from titanium then this won't be a problem.

Increasing the rev limit is also good on the motors when tuned like this, but it only accelerates the stock valve issue. You'll be looking at around 130bhp at the wheel when its all done though.

Best of luck with it and i hope someone that knows the solution is prepared to share it. Most likely you'll have to pay for that knowledge.


Yosh spring shims?

Shims that go under the spring seat. They come in 0.2, 0.3 and 0.5mm thickness. They are just simple washers in reality. They increase the seat pressure

Any Idea how much shimming?? Also what about engine life, these bikes willl be raced, I am worried they may fail as this is pretty hard on the valves and springs???

The shim size will depend on what springs you use, whether you cut the seats back, how much seat pressure you decide on, etc etc. Too many variables to say exactly what is required.
Like i said, you're going to have problems with titanium inlet valves cracking immediately if you just chuck in large cams with the wrong spring and seat pressure. Never used more lift on them as they fail on stock lift with harder ramp cams. I'd suggest changing the valves but you will need to do some homework on what springs to use.
Oh and don't forget you can't lap in titanium valves when doing the build up.

if your using 1000 cams couldnt you use the valve springs off a 1000?

The 1000 springs will go in but the seat pressure will be different.