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Phh32 were improved with having the spindles replaced and the bushes that go in to the body from the spindle replaced with bearings. Found them better, well the phh35 as if I used half a fulvia carb and no need to rejet.
lynx-
I had a box full of phh solex carbs, i bought from various places in the early 90s. When i got the chance to buy a panda 30 head that came with a dellorto carb i never looked at the solex carbs and they got sold or given away. The dellorto Dhlb 35 was perfect with the twin port head, they have bearings for the shaft and they work. Before the above set up i had to make up restrictor plates between the trumpets and carb body with the solex to eliminate a massive flat spot caused by chokes that were too big. It caught fire one day as the carb needle valve was no good and fuel would trickle back out of the trumpets, it spat back but luckily i stopped and blew it out before it caught the petrol line. By the time i built the blue car i knew what i was doing but never got round to finishing it. I still think the fzd is probably best for every day use. I did have a reece fish but never tried it as i didnt have the manifold for a 500.
VintageJon
I never used a solex other than a phh32 which was crap, the manifold was simesed two chokes into one port, the rubber flange plates used to flap and crack making the motor run lean, parts were bad to get even back in the late 80s, i did run a dellorto dhlb 35 on a panda 30 head which was v good but flange problems were bad again but it went well with that. I think people use samco hose type flange plates now. The single solex pbic 34 was good on single port heads.
This was what i used on the blue 500, although i sold it with a stock weber down draft twin choke and the weber dcoe went with it. The nicest set up is a dellorto fzd which makes a single port head go well without being a pig.