My bike - carb issues part 1

 I noticed when running the bike the carb was over flowing and petrol was poring on the floor, so I decided to strip the carb and see if there was anything obvious going on.

My first thoughts were either the floats were at the wrong height or something was blocked. After removing everything, blowing the jets through and checking the floats I couldn't see anything to wrong so I assembled and left it for another day. 

My next thought was to check the carb settings against the factory set up to see if the carb was in fact set up wrong. I have looked at the settings here: this is what I found.

The idle jet, atomiser and floats were out of spec and the needle was at the incorrect height presumably to compensate for the incorrect atomiser? 

The next thing that confused me was the carb model was slightly wrong, according to the manual it should be a PHBH 28 RD and my had the BD code.

Now the RD carb should be a power jet model, but this isn't referenced in the original carb spec so I am not sure if this is correct. The BD version seems to be a generic 2 stroke replacement carb. 

I ordered the correct parts from Dellorto suppliers Eurocarb to make by BD spec carb exactly the same spec as the manual. I also managed to pick up a RD spec PHBH28 of ebay as a back up plan but the slide is huge and the jetting is odd because of the powerjet so I am not convinced this will be any help.

The next step is to rebuild the carb and run the bike. I am convinced the heavier weight floats will resolve the over flow issue, however the battery died so the test will have to wait for another day!!!

If you have any information on the carb settings for a 89 Sintesi please comment bellow.

 

My Bike - bringing it home

 Fortunately I do have a use of a work van, which is very handy sometimes!

My bike - 1989 Sintesi Replica

Welcome to my new AF1 blog hopefully you found me from my other restoration which you can read and follow on www.mbx80.co.uk 

Back in the late 80's Aprilia launched the AF1 project 108 125cc motorcycle, it was like nothing else on the market, it made what the Japanese were producing look massively outdated. Over in Italy the 125 scene exploded with manufactures producing ever more exotic looking bikes looking to out do each other in some seriously cool late 80's/ early 90's paint schemes. 

I wanted an Aprilia bad, top of the list was the black and purple Sintesi, then the Replica. My friend at the time bought the number 6 Reggiani Sintesi replica and I almost bought the number 4 Replica which would of made a cool pair of bikes! Then Aprilia dropped the Futura and I took the plunge and bought a brand new 1992 AF1 Futura.

1992

Fast forward to now and the number 4 was a scratch I needed to itch, so I started to look for a bike for sale. I wanted post on an Aprilia facebook page presented a project bike and a deal was done. The bike was a runner, the engine had been out and the internal rubber seals replaced. the forks had replacement stanchions so had been re-built and it also had brand new tyres. Cosmetically it is a little tired in keeping with a 30 year old bike, all-in-all a good base as a project and something I can restore and make good.