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Modified the oem manifold. Reduced the width and created extra clearance for the exhaust transition. Lengthened the bolt threads then cut down to 4-3/8". Split cooling inputs x2.

Added wire reinforcement to the hood cut out. Will drop resin and glass on it tomorrow. Added (4) 3/8 bypasses. 3 for the head. 1 for the pipe.

A friend texted me pictures of his exhaust transition. I combined the two together and have a solution. I will install it during final assembly.

Completely rebuilt the carbs. Changed the N&S from 1.2 to 1.5. Returned jetting to factory specs. Installed new fuel lines. Drilled out the 3 carb restrictors and installed 1 in the return line. That will help balance the fuel pressure in all carbs. Installed a throttle bracket close to...

Modified hood by removing extinguisher recess to clear exhaust chamber. I will glass over to reinforce and seal.

I needed to remove the liner because the GP chamber is so tall. I used a putty knife, mallet and cutters.

Matt - Thanks to Dave at Impros. He knows his pumps. Otherwise I would have went -3. A little extra is always nice.

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Back to my build after several months off. Winter sucks so I installed a shop heater and some tunes. Trial and error is all I have. I made a few changes and was lucky enough to get top secret advice from a member here. I will be using the stock pump with a Solas 16/23 -5mm hooked up to a jet...

Installed the modified dash with breather holes. Installed the drilled out fuel selector. Installed the oil injector blockoff. Installed electrical box and most of the wiring. Need to order new crank, weisco piston kit, seals and gaskets. Need someone local to bore these cylinders.

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Fresh paint on modified bed plate.

Very nice work.

Those are from the stock SJ exhaust tubing that runs from the chamber to water box.

I removed the excess plastic from the bottom of the battery box and reinforced the sides with angle aluminum to create clearance for the OEM battery. Used button head allens to minimize height of fasteners. As you can see I now have room to fit a full size OEM battery. Might need that extra...

Yamaha909. Quick questions to help me decide. Stock or modified motor? What chamber 1100 or 1200? Carbs? Prop? Pump? Thanks bro. All input is very helpful.

3" exhaust is a great upgrade. That will work. Im going to run the OEM and see how it responds. :)

This looks perfect. 5 inches in total width and 4 inches in diameter. Maybe 2 of them welded together with a twist to offset. Or just one and a piece of 6 ply 350 F turbo hose.