If when installing adjustable pushrods... if i know im on the base circle of the cam lobe, why cant i adjust them there? Ive read over and over about making sure its at TDC on the compression stroke!!! Why? If its on the base circle why cant i adjust it there????Help me understand!!! I'll confirm that the piston is up but how do i confirm its on the compression side?
Im ready to start my cam install but just need some questions cleared up so my( simple) mind
can understand....

Im ready for the heat from some of you to fire off about (get the manual) I have one, but would like someone to explain the TDC base circle thing..

 

I can't answer your 'why?' question, but on compression the followers will be somewhere on the base circle with the valves closed, but on the other tdc the valves in the same cylinder will be partly open, assuming cam timing is correct!

 

I've never done it so I may be off but aren't both valves closed on the compression stroke so you could adjust both lifters? Exhaust stroke would have exhaust valve open I think .....sounds good to me anyway

 

Have you got a 131" in your bike?

 

It's being installed right now, I should have it back by the end of the week.

 

Ah yes, R&R? Looking forward to learning more about your experience with it!

 

Ok now im starting to get it!!!
Pretty clear ive never worked on motors, thanks for the help

 

Best of luck! Let us know how you get on.

 

will do.... im a decent mechanic, just never been inside motors, im more of a susp & drivetrain guy, ive watched as many videos and read all the articles i can about the subject. I'll get it started this weekend.....

 

No need to be at TDC, just ensure you are on the base of the cam lobe for each pushrod you adjust.