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just found this on U Tube .

http://www.youtube.com/watch?v=tR7RuheaXl4

Cooel Exhaust . Sounds like all the pieces are there .

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Originally Posted by Pre Unit
just found this on U Tube .

http://www.youtube.com/watch?v=tR7RuheaXl4

Cooel Exhaust . Sounds like all the pieces are there .


Yes i seen that vid pre unit and its just the sort of machine that i want to build, i asked the guy to come on here and tell us about it as its a real piece of motorcycle art.

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Hey guys. Where does one buy the Bob Newby clutch converstion kit to include the primary cover? Any idea on how much these kits cost?

[Linked Image]

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Thank LAB, I contacted Bob and he sells just the belt drive but not all the components needed for the entire Kit to include the Quaife 5 speed gearbox. Bob Newby said it's available possibly from P&M Cycles in the UK but I've not had an opportunity to call them yet. Thanks.

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The belt drive needs a drilled mainshaft for the clutch pushrod (actuated by a twin lifter in the gearbox cover). I am not sure but presume the Newby clutch fits on a standard mainshaft. You may be able to have the shaft drilled.

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One thing I like to do is extend the oil return dowels from the head through the barrels. I usually use an inch/25mm of tube for this.
I then counter drill the barrels and head to account for this increase. But I also run a NH 1000cc kit and the head sits a little bit higher on the lip of the bores.

Doing this - in my opinion - means that there is less chance of the oilway being affected by piston vacuum and pressure. It also means that, if you are using a sealant, the chances of any sealant flowing into the oilway when you tension the head down is negated.

I am not saying everyone needs to do this, I just saw benefit in it and the room was there to do it.

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Really common sens engine mode I did was doweling the rocker boxes.
It'll keep rocker box gaskets in place.

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Originally Posted by Adam M.
Really common sens engine mode I did was doweling the rocker boxes.
It'll keep rocker box gaskets in place.

Adam, can you please elaborate on how you did this ?
I have a persistent (small) oil leak from a rockerbox gasket.
Replacement of the gasket only cured the leak for a short while.


Last edited by Peter R; 08/23/16 2:56 pm.

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Originally Posted by ste
This is what you get for your money.
[Linked Image]


In this setup is there no cush drive? If so does the belt serve as the cush drive. Is there a big empty space were the clutch used to be?

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Yes, no cush drive and a big hole where the clutch was with the belt setup. The belt has steel cable running through it to provide flex but the stretch is nil (except for the modulus of elasticity of steel). Somewhat surprised there is not a belt drive for the pump. I think an offset sprocket is available to allow a wider rear tyre on a race bike.
Two ways to dowel the rockerboxes, using the outer two 5/16" bolt holes or the 1/4" bolts at the ends of the rockerbox. There is not enough material around the hole on the AM heads to use the 5/16" holes. The 1/4" holes can use used on either. The dowels are pressed into the rockerbox and slip fit in the head. You need a mill with a digital readout or CNC to do this properly.
As long as you are doing this you should spot face the three 1/4" holes at the pocket lip with a 7/16" end mill and use button head screws which have 64% more area under the head and less likely to crush the material around the holes.

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I am looking for info on this too..... there was an article in the British mags, many years ago....May have been by Norman Hyde. I read it and lost it... sigh !! I wish I had kept it... but it did involve a stepped down reamer to enlarge the oilway and fit a T160V oil feed pipe. also drilling open the corresponding oil feed hole in the oil pump, and crankcase. ... also the oil tank filter and piping.
That is all I can remember..... not much help sorry.

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Originally Posted by DMadigan
Yes, no cush drive and a big hole where the clutch was with the belt setup. The belt has steel cable running through it to provide flex but the stretch is nil (except for the modulus of elasticity of steel). Somewhat surprised there is not a belt drive for the pump. I think an offset sprocket is available to allow a wider rear tyre on a race bike.
Two ways to dowel the rockerboxes, using the outer two 5/16" bolt holes or the 1/4" bolts at the ends of the rockerbox. There is not enough material around the hole on the AM heads to use the 5/16" holes. The 1/4" holes can use used on either. The dowels are pressed into the rockerbox and slip fit in the head. You need a mill with a digital readout or CNC to do this properly.
As long as you are doing this you should spot face the three 1/4" holes at the pocket lip with a 7/16" end mill and use button head screws which have 64% more area under the head and less likely to crush the material around the holes.
I've always wanted to implement those things David, ever since you first described it to me. I've used 5/16" dowels on my AM head, no problem. I had my machinist drill through the rocker box and into the head. He then made and inserted sleeves through it, which protrudes and acts as a dowel. No chance for misalignment. Strangely enough the "Covseal" gaskets fitted over the dowels with no modifications.
I spot faced the 1/4" holes myself and used my own "button heads" as I couldn't find any locally. In addition, I drilled out the threads and used nuts and washers on the under side, to add some elasticity. I've only just tested it, but so far so good.

SR

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Ha - I did the same with button heads bolts, only problem my exhaust finned clips interfere with those nuts a little.

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