MOPED ARMY

You know what I'm going to say...lol! Bigger carb, bigger intake. That Polini intake port is way too big for that puny 14/12. That kit needs the volume to keep it running cool. Even if you put a bigger intake on it and upjet, it might help it out a good bit.

I know exactly what you're talkin about (lean mid, ok when WOT uphills). I reaaaaaallllllyyy believe it is just too small of a carb. You are full of good Minarelli advice that you have given to myself and others on this forum, and I hope I'm not being a dick by being a broken record on this subject. I hope you can get it to work, and if you manage to get it right, I would humbly like to inquire about your technique.

phgm 19mm dellorto! just do it! your kit will thank you!

No, it's not cooler as in temperature. Sorry, I guess that was the wrong context. More volume = more lubrication = happier, longer lasting kit.

I was running a 14/12, 64 jet (68 was WAY too rich), Mamba pipe on my last Polini set-up. It ran BEAUTIFULLY! I even opened it up WOT for a spell or two on a gently hilly backroad. It performed well, for the first 200-something miles. One day I was headed up a fairly steep hill, keeping it around 1/3 throttle when all of a sudden...VVVVVRR-ZZZZZIIIIIIPPPPDEATH.

Soft seize. It started right up, but since then, it hasn't run the same. That's the second kit I mangled from that 'suggested' 14/12 set-up in the directions. It is way more practical to go with a 19mm or higher. That intake port on the kit alone is about 20mm in diameter.

And that's my story :oD

WE are doing well with this equipment

What manifold is necessary to mount the PHGM19?

what else is new?

You're lean at mid throttle because you can't adjust the SHA carb to compensate. It really has nothing to do with its size. Its just the design of the carb. You can make it work by opening up the holes a little in the tube. But its hit or miss.

I just noticed this thread is 2 months old, so my advice probably comes too late.

Now might be a good time to look at the piston and cylinder, however, and sand down the high points on the piston, and maybe polish out any smears in the cylinder.

Because if you lubricate it too much, the wear that needs to occur for the rings to seat won't happen. People say that synthetic is "slicker" and doesn't allow the parts to wear into that seal. You need to be lubricated enough not to seize, but not so lubricated that the parts don't take the wear that needs to occur to seat the rings.

I didn't read all of the posts so someone may hav already said this but inorder to make my minerelli polini run proper mid range/throttle I had to make the bottom ventury hole a bit bigger(the brass tube in the middle of the carb bore) just a bit though, it was barely noticeable with the naked eye but I could tell I did something by the brass shavings.

There are no needles in a Dellorto model SHA carb.