Hi
I have been trying to find out about the cam timing !! When engine is at top dead centre were is the cam mark 90, 180,270 deg Everyone has there own idea I always thought it was at 90 in line wth pushrod's .

Rob

Hopr you can hel

Rob:

If that's an OS 70 Surpass II, the mark should be on a direct line from the cam center to the push rods, with the piston at TDC.

Bill.

Yes it is thank You !
Any Idea on were to get parts for this engine Need a carb and cam
Thanks
ROB

Rob:

I'm not sure of which models interchange on the four stroke OS engines, but I'm sure a little research will tell you which model Magnum engine has the same parts, and they are bound to be less expensive than with the OS name on the boxes. Possibly Hobby People knows the parts you need.

Changing the cam, be sure to replace the tappets as well. And replacement valve springs are also recommended. Should be no worry with the carb. Even if you have to get the cam and tappets from Tower, the Magnum carb from Hobby People should be a bolt-up.

If you find all the parts have to come from Tower, check the price for a new Magnum complete after you get the part prices from Tower. The new Maggie might be the better deal.

Bill.

Hi Bill

Thanks for the information have already sourced some followers. Am still a bit perplexed as the difference of the 2 Carbs.OS list 2 part No's for the SI&SII I have been unable to find out the difference!! I thank yo again
It is a little harder getting these parts here in Australia But I will persevere
Thanks
ROB

Rob:

Sorry as I can be; I didn't even look at your location.

Perhaps you can deal directly with [link=http://www.sanyemodel.com/html/ee.htm]S. Y. Machinery Co. Ltd,[/link], the manufacturer of the Magnum and ASP engines, as well as others.

Bill.

Thanks for All Your Help

ROB