• Welcome to the website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Hon. Editor and Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this website.

    If you have previously registered to use this forum, you should log in now. CLICK HERE.

    If you have never registered to use this website before, please CLICK HERE.

Comet pushrod length

craig

Well Known and Active Website User
VOC Member
I am having to seek out shorter pushrods to allow both the ET27 tappet adj to clear the ET24 screw on caps. Right now i have 5 7/8 on the intake and 5 15/16 on the exhaust, these will not allow ET27 to clear the caps. So i am seeking 1/16" shorter? Or should they be shorter to allow more clearance?
The cam is marked 2 R and looks like new. Head is NOS (not repro).

If the ET27 adj were socket head or slotted, this problem might not occur. Should I modify the ET27? Commonly done with mk2 cams?
thanks for any help
Craig
 

Bill Thomas

Well Known and Active Website User
VOC Member
Hello Craig,Thats what I do, I grind the Hex' Down all round, then make the top fit a 2BA spanner, Bit of a bodge but no cost and quick, or you can buy Socket head type. Good Luck, Bill.
 

timetraveller

Well Known and Active Website User
VOC Member
And as I have mentioned before in these esteemed pages it is worth checking that the cut outs in the top of the piston have a large enough diameter. Use Plasticine on top of the piston and then turn the engine over a couple of times to see just how near the valves are getting to the top of the piston. Tedious yes, but a lot cheaper than bent valves or worse.
 

craig

Well Known and Active Website User
VOC Member
Guides are shortened as required, I actually got both valves at max open and tested for addtional clearance, probably 0.100" The answer at this time appears to be simply trimming the adjuster hex off, cutting a slot for screwdriver...plenty of clearance now! I would rather have socket head adjust , i will order some. I cut the top off a valve cap for a view port...works great!
Craig
 

Latest Forum Threads

Can't Find What You Need?

Buyer Beware: Fake or Real?

Top