mikuni phh44 carbs

Step 1 was to balance the carbs, check plugs and tune.  

Symptom was overly rich on cylinder 3. After close inspection I was able to move the jet block 0.5mm.  The entire jet block is loose.  It was time to order parts.  Best afr I could get was 12.7 idle and running  and 10.5 on WOT.

Starting point for jets was 165 main and 210 air with 60 pilot.  

Tuning made it drivable but was still too rich on cyl 3.

Changed air correction to 220 and main to 160 and pilot to 57.5. Minor improvements for afr. Better performance but still too rich on #3.

Changed jets to 155 main, 220 air and 57.5 pilot.  Still too rich on #3.   So it's time to check the jet block and orings.

Rebuilt carb with cylinder 3.    The figure 8 o-ring was not sealing under the jet block.  This is accessed by removing the accelerator pump and removing the jet block retaining screw.

Cleaned the carbs and reinstalled with new o-rings.

Back to step 1 and balanced carbs.with syncronizer.

 Set pilots at 1 turn and restarted.   The afr jumped to 14.5 to 15.0 at idle and blips to 12.5.  

Opened up the pilots and it currently sits a 2 turns.   Will have to set after its on the road in spring .   Much better response 👌 

Final jetting is main 160,   air 220 , pilot 60 with 1 1/8 turn on pilot screw.

brakes

Time to replace the rotors.  Turns out the brakes are from a 70 to 73 celica/corolla/corona with 9" solid rotors. 

Calipers are Akebono 1 7/8 "1708"

the rotors were in rough shape and at $37 each its easier to replace than have them turned.

And now the new.

rear fenders

Started to widen rear fenders to match tire sidewall. 

step 1 remove fenders  

step 2 wire mesh template

remount fender to check template and adjust

Xps rigid foam template.  Next step is to seal and fiberglass into place.  Then remove fender and complete fiberglass work.

Test fit fender.

Seal and final fit is done.

polyester resin is in place

fiberglass in place and now top coat before primer

couple layers of sandable primer

Finished  fiberglass,  paint then remount fender.

transmission

Trans stamp 110-18551

Toyota 5speed

Trans fluid change to royal purple 75-90 w synthetic gl4/5

1.7liters 

exhaust dec 2020

Time to replace the burnt out glass pack muffler.

Started by gutting cat, installing heavy mesh insert in cat, replacing glass pack with flowmaster hp2 laminar flow muffler. 

Lots of welding and grinding to make it leak free then wrapping with header wrap.  

 

I like the sound and decibels have dropped by 10 according to the sound meter app.  the tone is a lot deeper too. 

metal boot cover

I was looking at several different soft boot covers.  For the money I did not see anything that I liked and would let me lock the removable steering wheel away and out of site.

A little more fit and finish is needed then some paint and the lock.  

All metal with sliding plates around roll bare brace.  

Lock installed and cleaned.  Need to decide if I will leave the metal raw or paint black.

Under the Hood

   several months and a few adjustments made

 - under hood seal

- removed evap canister and lines that were not connected 

- installed fuel filter

- installed new mechanical fuel pump

    - pump was too high a pressure.  the New old stock pump was suppose to be 4 - 8 PSA.  It was running at 6.8 psi when installed.  

     - installed Mr Gasket 1 - 6 PSI fuel regulator

    - set Fuel Pressure on regulator at 1.5 PSI and it measured 3 at the Carbs with Fuel Pressure guage

MSD Ignition

- unable to set the timing to 12BTDC with timing light.   MSD needs old school static type.  

- separated the plug wires to ensure best chance of setting timing on Cyl 1

- plug wires did not have ends at the Dist.

- installed plug wire ends and re-routed wires for seperation

- set timing with 3122 timing light. to 12 BTDC

Carb Setup

- Adjusting the air horns changed the fuel needs.  Mikuni PHH44 were overly rich and fouling plugs

- changed plugs to iridium.

- Overly rich and poor milage 

- turned down fuel at Pilot jet screw.  from 3 or 2 turns 

- installed innovate MTX-L AFR Guage

    -  AFT at 10 or less at idle, Cruze AFR 10.5 and transition 11.2 and WOT 10.2

    - turn down fuel to 0.5 to 1 turn out

    - AFR at Idle 11.9 to 12.2.   Cruze 12.5 and WOT 12 with transition 12.5 to 13.4

- adjusted idle down from 1400 hot to 900 hot

   

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