vernier adjustable cam gear

[blackxt 699]

Can any one suggest somewhere to get a adjustable cam gear for a 4 litre. New cam need some fine tuning .

[slydog 7,873]

Ross???

[n00bus m@x1mus 465]

I got mine from rollmaster on ebay, was like 200 something i think. They have a weird way of lining up the timing marks, not as u would expect. You dont sit the timing mark at 12 oclock on the cam like the stock one, it sits at about 3 oclock perfectly in line with the top face of the head, then you adjust the cam as needed.

[blackxt 699]

 

I got this one . It was the only one on ebay. Hopefully its OK quality.

Sent from my XT925 using Tapatalk 2

[n00bus m@x1mus 465]

Looks ok, you will need to knock that roll pin out the other side but as its not supposed to be poking out he front side. And it looks the same layout as mine, note the cam pin is in line with the timing mark? This means it will be laying over at 3 oclock to have you cam correct at TDC no1. To adjust you turn the crank with a bar and socket 360 degrees ATDC so the timing marks on the cam gear will be at 9 o'clock... loosen the 3 screws that are sticking out and then crank the motor with a bar 360 degs back to TDC no1, your cam timing marks will now be at 3 0'clock again and then loosen the last 2. Now crank the motor backwards or forwards noting that the vernier gears marks are rolling from R to A, i think there will be about 8 degs either side of TDC, when your desired advance or retard is lined up tighten the 3 screws above the head and then rotate 360 degs to do the other 2. Dont over tighten them or you will strip them and your stuffed then.

[blackxt 699]

Awsome thanks for the advice.

 

Sent from my XT925 using Tapatalk 2

[revhead 1,392]

I got mine from rollmaster on ebay, was like 200 something i think. They have a weird way of lining up the timing marks, not as u would expect. You dont sit the timing mark at 12 oclock on the cam like the stock one, it sits at about 3 oclock perfectly in line with the top face of the head, then you adjust the cam as needed.

ive always set the timing on all 4l donks at 3 degrees above the head,with the timing mark

[n00bus m@x1mus 465]

So that would be retarded 3 degs? So about 6 degs on the crank then?

[revhead 1,392]

So that would be retarded 3 degs? So about 6 degs on the crank then?

spot on ,never ran into probs,

[n00bus m@x1mus 465]

And retarded moves the powerband up the rpm scale right?

[revhead 1,392]

correct,

[Thom 6,651]

Yella terra also sell them as a gear on their own or a timing set

[XDPSI 10]

Got mine from atomic. Haven't ran the motor yet but it wasn't too hard to install.