6 days ago
Another head refreshed thanks to Jerry @ General Engineering. Fresh bronze guides and seats, R/D beehive springs, stainless valves made from Ferrea blanks (37.5/32). Cleaned out the old epoxy in the intake port, welded and reshaped. Ready for another 35 years of service. ... See MoreSee Less
For those who like details;
37.5 Ø Intake
31.0 Ø Exhaust
1.5 Ø Exhaust header
Stainless steel valves, single radius keeper
Set up for Rotax 860 cam
Remove seats and guides, bead blast head
Inspect casting for cracks
Machine seats from 630 bar stock, intakes use stepped inter-loc style which require to be machined and installed one at a time
Machine and install exhaust seats
Bore exhaust header opening out
Taper intake guides and install, shorten exhaust guides and install
Hone ID to size, machine valve seats
Machine valves from blanks, standard length, modified keeper location for customer springs
Port intake and exhaust, check on flow bench
Fly-cut gasket surface, adjust spring pre-load
Clean and assemble
Weld floor of intake port next to manifold
Machine new intake manifold from bar stock
Taper bore ID and mill exit side.
Hand port to blend into head
Size for 600cc motor
Porting and calculating diameters for correct port speeds
*The additional work was required because the head was ported by Lillie and needed to be modified to work correctly.
Jerry: the Gandalf of engines.
In all fairness to Harry,back when he did that head none of the research,technology,machine tool technology or accurate flow therory was available at the privateer level.Even my Axtell/Libby head has epoxy in the intake. Check the provided specs. They did things differently back in the day.
Jerry IS a clever dude !
3 weeks ago
Before and after. Rebuilding a 450 Rotax engine. Thanks to Mike @ EDCo for the good work. ... See MoreSee Less
4 weeks ago
There are still a good amount of people out there using the VM44 carburetor and need replacement cables. It's something we special order for customers every once in a while.
Motion Pro changed their custom cable pricing recently, this increased the price on cables by a considerable amount.
Because of that change we will be having a production run of cables for the MP Turbo throttle to VM44 carburetors. Motion Pro custom cable price is $60, we will retail them for $40.
Contact us if you are interested in purchasing a cable. ... See MoreSee Less
Count me in for two cables when you get them in.
Complete carburetor kits are now available. Possibly the best carburetor set up for a Rotax of any size, we even use the 45mm on our 500 and 660. The Motion Pro Rev2 throttle kit paired with our light return spring makes the throttle smooth and near effortless. The kit includes everything from the manifold to the filter. Price starting at $818.11 excluding manifold and filter.
www.elliottpowersports.com/product/carburetor/mikuni-tm45-race-kit ... See MoreSee Less
Elliott Powersports now has Forma boots available. One of Europe's finest boot makers, designed in Italy and manufactured entirely in Europe. Worn by top racers around the world.
Featuring the Ice Pro roadrace boot for protection and light weight and the Boulder trials boot for an economical yet tough alternative.
Forma may be new to flat track, but top US Speedway racers wear Forma. Many US motocross, supercross and off-road racers wear Forma.
All Forma boots are available through Elliott Power Sports ... See MoreSee Less
Elliott Power Sports is now carrying AFT spec fuel (Sunoco 260 GTX)
Message us for more details. ... See MoreSee Less
The 676 kit is the ultimate upgrade for your Rotax.
Modified cylinder casting with liner installed, bored and honed to spec with special torque plates. Supplied with matching piston kit, head gasket, base gasket selection, and special nuts for the 8mm studs.
Kits are available with 102mm and 103.1mm bore. ... See MoreSee Less
Check out this work of art, 90mm bore 10.5:1 compression for a Rotax 450 project. Can't wait to see this thing run. Using a 604 bottom end with a 350 crank and custom Carrillo rod.
If anybody is interested in building one, I have 2 pistons available. Rods can be custom made with no minimum quantity. ... See MoreSee Less
That just might b the thickest top ring land I have ever seen. Lots of machine work on that piece 👍👍🏁🏁
Leland Johnson look at that. It’s a lot like yours.