How to: Fit Yoshimura ST-1 Cams

[elderhome]

Has anybody measured lobe center degrees from yoshi ST- 1 or std cams? Yoshi ST-1 brochure says 105/105 degrees, but measured degrees? How about lobe centers of std cams with std sprockets?

You got the point!  I did check the oem LC number is 100/103.5. If you just bolt on the ST-1 Yoshi camshat,  you will find out it is far away off from the recommended LC 105/105! You have to redegree it for the recommendation setup properly. But it is not easy for DIY,  please consult to ur mechanic or experienced engine builder. Don't be shy!
PS.  As I know most of people just bolt it on without degreeing,  engine runs without problem but not in a proper initial setup!
After installed,  it revs from mid to high with linear power output and reduce engine brake a lot!

[grog]

Not sure if this is a dumb question. Would the standard cams be dialled in perfectly, from the factory

[T 24]

Not sure if this is a dumb question. Would the standard cams be dialled in perfectly, from the factory

There are no dumb questions.
Standard cams are in standard position, and they aren't able to adjust with standard, unmodified, sprockets.
The timing can vary a bit, when the timing chain is wearing or the cylinder head surface has been grind.
Timing of my standard cams was 99°/104°, if I can remember correct.

[Snorre Kristoffersen]

Has anybody measured lobe center degrees from yoshi ST- 1 or std cams? Yoshi ST-1 brochure says 105/105 degrees, but measured degrees? How about lobe centers of std cams with std sprockets?

You got the point!  I did check the oem LC number is 100/103.5. If you just bolt on the ST-1 Yoshi camshat,  you will find out it is far away off from the recommended LC 105/105! You have to redegree it for the recommendation setup properly. But it is not easy for DIY,  please consult to ur mechanic or experienced engine builder. Don't be shy!
PS.  As I know most of people just bolt it on without degreeing,  engine runs without problem but not in a proper initial setup!
After installed,  it revs from mid to high with linear power output and reduce engine brake a lot!

Hi! Do you remember how far from 105° the ST1 cam was at drop in? (did you have to adjust forward or backwards…?)

[The Stumeister]

Getting Yoshi cams fitted soon also. Is the running in time of just 300km enough...?
That's approx 180 odd miles and when running them in and keeping it under the revs as stated,will the bike still run fairly ok even tho the fuelling will be out etc..?

[seth]

 
500 miles total varied rpm but with these as a soft max revs
200 below 3000 rpm
200 below 4000 rpm
100 below 5000 rpm
Then an oil and filter change and dyno
Then full power available .
Not the law but this Is what I did and now got 30000 miles on mine since.