Tips for rebuilding Solex carby's?

[smokem1]

going to attempt to rebuild pair of solex 40mm's. Got rebuild kits and going to strip carbs down and acid bath. My mate andd i are confident we can do a good job, but having only done V8 carbs before was keen to hear if anyne has any tips for rebuilding?

[Rodger]

smokem1.

Depending on which model.

If they are the ones that have the intergral choke/jet cover typically off 18R-Gs then the build kit may not contain this cover gasket so try to save it.

If they have never been touched before you may find some screws and things are either very tight or break or get damaged when taking them out.

Ok when taking apart and in no particular order.

1) Remove everything you can including the throttle shaft and plates.

2) Make sure you don't loose the small ball bearings used in the pump circuit when you take the top off and turn the unit upside down.

3) Check the inner venturis for wear or damage.

4) Check the pump jets as you take them out making sure they have been installed correctly last time. There is a "D" shape to point them the right way and that the old washer/seal is removed. There should be a new washer/seal in the kit.

5) Blow out all the passage ways.

6) Check the idle mixture screws. The taper can be recovered by placing in a drill press chuck and using a file. If a tip is broken off then it is most likely stuck in the body of the carby.

7) Check the "O" ring seals on the bottom of the jet block.

Somethings when putting back together in no order.

8) Install the throttle plates and shaft and check for twist by lining the plates up with the pilot jet holes. The shaft can be twisted back into place. Use Loctite for the screws.

9) The inner venturi locating screws need to be firm but not over tightened.

10) The pump jet lever needs to have around 6mm of travel and can be adjusted.

11) Install the main jet onto the emulsion tube, install and tighten this into jet block and then install the top main air jet.

12) OEM float level is 12mm from bottom of main cover to the top corner of the float, when resting against the fuel inlet valve.

13) Start with 1.5 turns out from closed, on the idle mixture screw when re-installed.

I have been working on Solex/Mikuni for years, any questions when doing this please ask and I can try and help further.

Just work carefully as you take them apart and you will soon learn how it all goes back together.

Regards

Rodger

[kingmick]

and to add to that! make sure every surface and part is extra clean!

[RA23]

12) OEM float level is 12mm from bottom of main cover to the top corner of the float, when resting against the fuel inlet valve.

13) Start with 1.5 turns out from closed, on the idle mixture screw when re-installed.

Rebuilt mine some time ago and used the green book. Dropped the 18RG in and she started at once. I haven't touched the carbies since, although they desperatedly need a tune.
I had never touched carbies before, so if you have some experience it should be straightforward.

[Rodger]

RA23,

My numbers come from a Mikuni Service and repair Manual and probably different from Toyota's TA-22 service manual.

I agree, once serviced and tuned the Solexes will run for another 10 years.

Regards

Rodger

[SRacin]

Hi All,

I'm also about to rebuild some type 5 18rgu phh40 solex sidies. Great Thread. However the most important question, where the hell can i get the rebuild kits from?

Much Appreciated. Carbs are going onto a kp61 starlet sprint for my better half, along wiht a nice engine rebuild. Fun little cars!

Cheers
Logan

[Rodger]

PM me Logan,

I'll have to check to see if I have a couple of sets at home. Do you have the S5 or a latter one with intergral choke/jet cover the one with the electrical connection on it, a T5.

The kits I get have everything except that top choke/jet cover gasket for the T5.

Regards

Rodger

[thechuckster]

don't acid-dip alloy carbi parts - use proper carbi cleaner.

[kingmick]

you can acid dip them in proper alloy acid! you could always strip it and take it to a machine shop and get them to alloy acid them or if they have a hot tank even better.

[takai]

On a similar topic anyone got some suggestions for rebuilding possibly the smallest DCOE i have ever seen. Its seriously like 15-20mm inlet, and tiny.

[SRacin]

Hey Rodger.

Did you get a chance to have a look for some kits?

Cheers
Logan

[RA23]

Hi All,

I'm also about to rebuild some type 5 18rgu phh40 solex sidies. Great Thread. However the most important question, where the hell can i get the rebuild kits from?

Much Appreciated. Carbs are going onto a kp61 starlet sprint for my better half, along wiht a nice engine rebuild. Fun little cars!

Cheers
Logan

Don't know about the type 5 bit, but I got my rebuild kits from Repco about 2 years ago.

[Grega]

um, some good info here (sorry for digging up an old thread)

http://www.190slgroup.com/tech/clamps/mikuni-phh.pdf