The 4* advance kind of mimmicks a slightly higher compression...closer to 9.8:1. The TW6 likes 10.2:1 as it's sweet spot.

Some people use the 4* advance in lieu of milling the heads as a temp fix.

Stock, the 96" is ~9.5:1 compression in reality. You could also use a .030 head gasket and gain about .25-.3 in compression. I did not go that route.

 

Is Bob making a combo cam? I haven't seen any sort of tw6-408 cam offered on his site.

 

So did you ever get your timing gear snafu figured? As to adding the advance gear, it's not "mandatory" just more of a " you're in there do it" type of thing, no?

 

You don't need the advance. On my 96" the .030 head gasket gave me .25:1 more compression, the 4*advance would have been .14:1 more, it's just a small bump but that's all I was looking for.

 

Think I'll go with just cams, possibly gear route if I can get one shipped with my cams. If I'm going to pull the heads to add thinner base gasket I may as well have em ported lol. Unfortunately the budget won't allow that just yet.

 

I was going to do just the gaskets until I saw the heads, the black krinkle paint isn't just on the outside, it's inside also.

 

Ya that's one reason why I want to leave the heads on, just one more thing I can talk myself into spending money on lol. Ah well, I only have to ride it this way til winter when the "Big-Bore Bunny" comes to visit
THEN the heads etc will be done and can put the proper package together.

 

Oh ... I hope the big-bore bunny visits my house ...!

 

Yeah...I figured it right into the corner of my toolbox for the moment.

Right, installing the advance gear is an option not a necessity.

 

Dyslexia, meant to write TW 408-6