Nebr_Rex
Coast to Coast
doc_rot said:looks like the exhaust is set at 110 BTDC from the factory. but since my head was decked i will have to check it.
Bingo!
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doc_rot said:looks like the exhaust is set at 110 BTDC from the factory. but since my head was decked i will have to check it.
doc_rot said:I dremeled out the valve pockets and there is plenty of room now. I also cut the tach gear off an extra exhaust cam so I can use that cam on the intake.
intake base circle is 33.1mm with 8.1mm lift the exhaust has a 32.3 base and 9.84mm lift
my stock intake cam was shimmed at the very end of the shim range at 340. once i put in the exhaust cam i needed another .4 mm to make up the difference so I had to disassemble the head to put in some different vavles to get me in the shim range. I had the new valve faces ground and lapped them before reassembly. I realized i never took an photos the port and polish my buddy helped me with. We didn't go too crazy, just removed the casting flash and smoothed out the ridge where the valve seats were cut.
I measured the stock intake lobe center and found it to be at 79.5 BBDC, the manual states it is 80 BBDC. I plan on timing the exhaust cam on the intake the same as stock.
Interesting to note that the TDC mark on the advancer was 2 degrees off actual TDC which I found with a piston stop.
JadusMotorcycleParts said:Now that's some trick stuff! Pumper carbs will be awesome 8)
But from the photo, I only see a pump on one of the carbs? So only one cylinder sorts the lean throttle condition and carries the other until fueling is stable?
yes, this is how the racks of 4 are set up as well
doc_rot said:$500 with tax and shipping. Megacycle wanted 750 before tax and shipping
doc_rot said:Yes. this is how the racks of 4 are set up as well
There's a circuit of tubes that feeds nozzles in each carb. The pump is always on #2, which also usually doesn't have a sync adjust. You sync the other three to that carb.JadusMotorcycleParts said:Now that's some trick stuff! Pumper carbs will be awesome 8)
But from the photo, I only see a pump on one of the carbs? So only one cylinder sorts the lean throttle condition and carries the other until fueling is stable?
canyoncarver said:Not bad at all. Did you have to provide cores?