Author Topic: Float levels OK? By clear tube - Mikuni TMR32  (Read 1522 times)

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Offline PeWe

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Float levels OK? By clear tube - Mikuni TMR32
« on: March 28, 2015, 02:12:47 pm »
I'm going to do the float levels correctly?
I need to be sure that I'm doing it right before adjusting carb 1,2 that seems to have too high float levels.
3, 4 are OK as I see it.
I'll adjust the floats so 1,2 will be like 3,4. These carbs have angled float bowls, the front end must be the most important, right?
See photos.

One more thing visible on photo of carb 1 stamped TMR32 D11.  (68-84-68mm)
The set is according to CB750 std body interval, that is named TMR32-D7 (75-82-75mm)
This was the first thing I checked together with diameter 32mm. I compared with my original CB750 K6 carbs fronting each other.
« Last Edit: March 28, 2015, 02:58:12 pm by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Old Scrambler

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Re: Float levels OK? By clear tube - Mikuni TMR32
« Reply #1 on: March 29, 2015, 07:12:51 am »
Very sanitary ;)

What size are the jets?

What is the ID of the intake tube runner?.................Manifold runner?

How difficult was it to set-up the fuel-rail?..............or individual feeds?
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
'63 CL72 Project(s)
'66 CL77 Red
'67 Triumph T100C
'73 750K3 Owned since New
'77 750F2 Cafe Project
2020 ROYAL ENFIELD Himalayan

Offline PeWe

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Re: Float levels OK? By clear tube - Mikuni TMR32
« Reply #2 on: March 29, 2015, 02:02:03 pm »
Very sanitary ;)

What size are the jets?

What is the ID of the intake tube runner?.................Manifold runner?

How difficult was it to set-up the fuel-rail?..............or individual feeds?
I'm currently testing jets. I got them with main 150, pilots 27.5
Now main 140, pilot 25
Pilot mixture screw setting make a big difference.

Fuel supply has caused some issues so far. I have used poor quality fuel hoses, one collapsed in an "should be OK" bend and caused too lean 1-2. Never happened back in the 80's. Fuel hoses were not that crappy then.

There are 2 fuel t-pipes for 8mm hose. Between 1-2,  3-4.

I'll change the routing of fuel hoses and use better quality that can withstand fuel, US made instead of China from cheap autostore. I think a nice bend upwards over the carbs to the tanks 2 x 6mm tubes. I'll use 90* plastic bends direct after tank tubes, later on on 6-8mm connections. It will be some additional hose clamps.

Photo show steel bradied hose. This is crap! A very sloppy hose under the steel braiding. Difficult to tighten the hose clamp when the tourque will twist clamp and hose will go off the carb pipe. It is 8mm ID but its too soft so 7mm would be better.
I have just ordered better... BarricadeĀ® Carburetion Fuel Line Hose  from Gates sold locally on an Internet shop here.

They have 32mm intakes.
« Last Edit: March 29, 2015, 02:49:57 pm by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline PeWe

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Re: Float levels OK? By clear tube - Mikuni TMR32
« Reply #3 on: March 29, 2015, 02:19:59 pm »
Update of floats:
Floats adjusted a little. I did not want to bend the lip more than needed. Floats not easy to remove when carbs mounted on bike.

How the bike is leveled did some too. Added a tool under the centerstand, before 2" wooden plank only.
I adjusted 1-2mm, bike leaning less did another 1mm.

I'm still not 100% sure that the fuel level should be like I have, but all 4 are equal now. Onle 1, 2 adjusted.
EDIT: I should not have touched the float settings. 1,2 got too lean at WOT. Changed back later after dyno runs with A/F check

« Last Edit: August 19, 2018, 09:45:16 pm by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Old Scrambler

  • My CB750K3 has been in 39 States & 5 Provinces
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Re: Float levels OK? By clear tube - Mikuni TMR32
« Reply #4 on: March 29, 2015, 04:23:04 pm »
PeWe..........Thanks for the info.............Great Pic 8) 8)
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
'63 CL72 Project(s)
'66 CL77 Red
'67 Triumph T100C
'73 750K3 Owned since New
'77 750F2 Cafe Project
2020 ROYAL ENFIELD Himalayan