Most motorcycle problems are caused by the nut that connects the handlebars to the saddle.

My Track bike project

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Beresford
the 900
the 900

Posts : 1430
Location : not that far from Kirkistown

Re: My Track bike project

Post by Beresford on Sun 07 May 2017, 8:45 pm

It's just that a bellmouth of some sort is necessary for non-turbulent flow into the carb venturi. Also the length of the tract from inlet valve head to bellmouth lip is somewhat critical for your target rev range.
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ANDYC
the 900
the 900

Mechanic
Posts : 748
Location : Windsor

Re: My Track bike project

Post by ANDYC on Sun 07 May 2017, 9:09 pm

The adapter acts like a venturi, it's just more stable to clamp the filters to. A shorter venturi is better for higher revs.
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ANDYC
the 900
the 900

Mechanic
Posts : 748
Location : Windsor

Re: My Track bike project

Post by ANDYC on Thu 18 May 2017, 4:34 pm

Headway is being made, slowly but nevertheless Very Happy 
One of the filter adapters arrived, the other one has to come from America.


The carbs are now linked together and have a common operating rod. I wanted to keep the profile of the carbs as low as possible to give me clearance for the underside of the fuel tank. Hence the cable linkage is at the side where I have plenty of clearance.

On to the exhaust side now. As they say what goes in has to come out, so I have gone for large bore header pipes which will be held on to the head with springs rather than the conventional stud/bolt/flange method.
For this reason I had to machine a pair of spigots that do bolt onto the head (but they will stay fixed there) to locate the headers.
They were turned and bored out of 75mm solid steel bar. The last picture has a piece of the pipe that will be used to make the 2-1 system. It was handy to have a spare cylinder head to test fit them to.



Not sure what finish to put on the finished headers yet, I probably will leave such decisions until I can see it actually on the bike.
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russellj
Newbie
Newbie

Posts : 1

Re: My Track bike project

Post by russellj on Sun 16 Jul 2017, 5:27 pm

dear Andy,I have been reading track bike project article,fantastic reading,you say you break bikes now!I would love to speak to you,my contact no is 0785 800 1995,I live at Carlisle its a shame I am 300mls up the road from you!
Hope to hear from you,
Kind regards,
Russell Jones.

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Re: My Track bike project

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