Scooterotica

hi tried to look for jetting advice but couldn't find any
so here goes I need a close jetting for a t5 with a phbh 28mm delly on and a simoninni pipe
can anyone advise me please
cheers steve

I had a 28PHBH on my old T5 with a standard looking performance box pipe (forgot the name) from memory it had a 55 pilot, 40 slide, x2 needle and I THINK a AV 266 atomiser, the choke was a 70. The jetting is scribbled down in a note book at home but I'm at work at the moment, I'll double check tomorrow. It ran very nicely with that on, I replaced it with a Spaco copy of the standard 24mm but lost a lot of top end.

Ok, I I just checked the notebook and I was a bit out

The settings were:
Main - 115
Idle - 63
Choke - 70
Slide - 40
Needle - x6
Atomizer - AV 264

I ran it routed through the air box but without filter.

colin

hi coaster I bought this t5 engine and it came with a malossi manifold etc fitted but for the life of me I cannot get it to run properly so I took it apart and found that it has been ported etc and the sealing pad has been removed and the crank has been ground down, now I don't really know Vespa's but does this need to have a reedvalve and not just the big carb to work properly or can it run just with the big carb
also it keeps blowing at the head do t5's have a head gasket as bought a set and didn't have a head gasket in the set
cheers steve

I'm not certain but I THINK mine had an ally head gasket, I could be wrong though

Not able to help on the other issues as despite running the T5 for a couple of years I did nothing more than running repairs really, I'd repost as a separate question, plenty of Vep experts on here

that needs a read valve and your head sounds slightly warpped mate

It looks as though someone has had a half arsed attempt at porting for a reed but sealing pad is still there so it's going to be difficult to get it to run properly without a fair bit more work.

Steve, Yea, this has been butchered. Reminds me of some of my tuning 30 years ago

Assuming you have shown us the worst of it. If you just get rid of that ruined crank then it might be ok. It will just about be ok without a reedvalve. At high rpm the inlet valve sealing pad actaully sealing is less important. Get a race T5 52mm crank or a longstroke 54mm T5 crank and if the rest of the engine is all ok then you will have dodged a bullet.