We are located in sunny WHITE ROCK, BC, CANADA

Contact Jim Bush by email

Phone 604-535-5800




project file: MV AGUSTA 1970's CLASSIC RACE REPLICA with a modern 2004 MV 750cc F4 engine

ENGINE MODIFICATIONS: My Blog is in reverse date order - older posts are below, starting Aug 3, 2011

See the May 2013 Fuel Injection Modifications that superceed the informatiom below HERE

April 26, 2012 - CNC machined velocity stacks made and installed. I stayed with the typcial straight taper type - 3deg x 2 1/2" long with rounded front lip and a fine stainless steel mesh screen. They are a nice tight fit in the throttle bodies and clear all the wiring and hoses behind the engine.

stack1 stack2

March 18, 2012 - Manifolds were hand blended on the inside to match the base plate and finished on the outside with silver manifold paint. The only issue now with the throttle bodies is making a bracket for the throttle cables. I think I have a solution - it involves splitting the throttle bodies and fabricating a metal bracket. Below is a shot of the type of velocity stack (or trumpet) I plan on machining from 2 1/2" billet aluminum.

mainfold8 trumpet1

February 22, 2012 It has only taken 7 months to get around to completing the manifolds. After grinding and fitting the elbows to fit a welding jig, Expert TIG welder Maurice completed the aluminum welding of the elbows to the waterjet manifold plate. The throttle body pack now sits nicely under the frame rails. There is at least 1/4" clearance from the frame rails. I will weld 2 tabs on the frame to support the throttle bodies. The manifold welds will be cleaned up and bead blasted for a silver paint finish. I plan on making a set of classic straight velocity stacks used on the race MV's- it should throw a few peolpe off seeing injectors with velocity stacks.


tb1 tb2

August 3, 2011

First custom engine parts are underway. In order to squeeze the fuel injectors under tank, it is necessary to modifiy the manifolds with a tight bend. I had my friendly waterjet guy knock up some 1/2" aluminum mounting plates using the original ones as a pattern. I sourced some 2" aluminum elbows from a turbo parts supplier on eBay for $10ea. These have now been cut to lenght and machined for the rubber boot. Final fit and alignment still to go and TIG welding together. I will make up an alignment jig for the welding process so the manifold will match to the injector bodies.