Mikuni TMR32-D7 went on today! New carb boots from cruzinimage_co (could not resist that price!). (I did not use the (with boots delivered) hose clamps that tightened too much oval for me. I reused my old stainless steel clamps from the 80's. Quality sucked, cracks within a few months. Honda boots on.
I had to warm the rubber with heat gun as usual. 1:st gear in and push carbs on with some force.
CB750 std style throttle cables worked fine. I had to add one M6 nut (10mm key) on the push cable so it got 2 nuts locking it. The nut had to be cut with saw so it could enter the wire. All nuts got blue thread locker Loctite compatible.
http://www.wemoto.com/bikes/honda/cb_750_k6/77/picture/throttle_cable_a_pull_-_slinky_glide/http://www.wemoto.com/bikes/honda/cb_750_k6/77/picture/throttle_cable_b_push_-_slinky_glide/No need of Mikuni throttle assembly KSR-001
The filters however, are really tight! I ordered KN oval filters (54mm fitting on carbs). I guess cone shaped might be an easier fit. The outer filters (1,4) had to be angled outwards when it is tight fit between filters and the hose clamps for fuel hoses that come out between 1-2 and 3-4. I could not angle the fuel pipe on carbs downwards when the fuel hose clamps need space. Fuel hoses aiming backwards a little bit up. There is a long bar holding the carbs together that make it impossible to aim fuel pipe backwards and down. To the opposite direction, too close between carbs. It should be possible with fuel hose without need of clamp holding it.
One issues is the 2 fuel pipes on carbs for 8mm hoses, pipes on tank for 6.3mm hoose. I'm currently waiting for reducers 6.3mm-8mm. I'll use the thinner hoses from tank and use the reducers/adapters before hitting the engine case.
http://www.do88.se/bilder/artiklar/zoom/NR6-8_1.jpgFuel filters with entry hose diam 6.3mm from tank and secondary side 8 mm to carbs would be a good alternative.
I changed jettings:
mains from 150 to 135 Update: 135 too lean at road test with OK fuel hoses. Back to 150. Waiting for the returned winter to go away so I can test.
pilots from 27.5 to 25 and back to 27.5 again. Update: back to 25 which is correct. Kink on fuel hose tricked me earlier.
Air screws or fuel screws, 1 turn out as delivered.
Pilot mixture screws, fuel or air? Update: Fuel verified
These carbs have vacuum connections so I can synchronize them with meters. I hope that float bowl levels are correct. My clear tube tool for my old VM29 fits these carbs too, same diam on bottom plugs.
Waiting for small parts again until test ride. There is too much sand on roads left used on icy roads past winter. Roads will hopefully be brushed and sand removed soon.
Twisting the throttle with these carbs is very easy!! Very smooth and need only 1/6 turn fot full throttle!! My old carbs OEM and VM29 needed a regrip of handle to hit full speed.
I'm very curious how the bike will react with this short throttle turn PLUS acc pumps!!
Update: Engine idles very smooth compared with my old carbs. 1200 rpm despite rather hot cam.
When revving the engine I get thoughts about lightened crankshaft.Reacts like plenty of mass less. But carbs only!
Soon road test.
Several Dyno runs and road tests fixed the carb setup:
Pilots: 30
Fuel screws 1 1/2 turns out
Needles: 2:6 from top
Mains. 135. ( 137.5 with more open exhaust)
Currently 1005cc. It will work with 836 too.
Again the frame mod made everything much easier!
Remove tubes, access the carbs much easier. Thank you very much Frank! (forum member 754)