I recently became owner of a 1974 Blanco by Intramotor Gloria. This ped has been sitting for a number of years and the previous owner had no luck trying to get it to run.
I brought it home as a challenge lol.
First I checked that the motor wasn’t seized. So far so good.
Then I checked for spark. Again I was lucky, there was ample spark at the plug.
That led me to fuel. I put some fuel in the cylinder and the ped started right away. So I figured with the bike sitting for a number of years, the carb would need a good cleaning. Boy was I right.
I removed the carb, and took it apart. Lots of varnish inside, and the main jet was plugged solid. I removed any rubber parts and soaked the rest in carb cleaner overnite.
Meanwhile I bought a new plug, drained the fuel tank, refilled with fresh fuel and installed an inline fuel filter.
I managed to get the carb clean and the jet unclogged. Float and needle valve seemed to work fine. I blew everything out with compressed air and reassembled the pieces.
Lo and behold the ped started up easily and ran like a top. It ran great for about an hour. Top speed was about 30 mph although I am only guessing since the speedometer was broken. After about an hour I noticed that it started to bog as I applied the throttle. I figured maybe a piece of dirt or rust made its way into carb so I pulled carb, disassembled and blew compressed air thru it all. I reassembled and put back on bike. Same problem. The bike starts easily enough, but seems to be flooding when I give it throttle. There is bluish smoke coming from the exhaust as well as black carbon like particles.
I have checked the air filter and it is fine. The motor runs the same with or without the air filter on.
If I blow compressed air through the carburetor, while the bike is running, the motor runs like it should.
To me it just seems like the motor is flooding itself when I give it throttle.
I have done a plug chop, and the new plug is quite black and carboned on the tip.
The motor is a Minarelli 49cc, 2.2 HP. The carburetor is a Dellorto sha 14 12.
Anyone have any ideas what might cause these symptons and what to try next?
Oh yeah, I did a compression test and the compression is 105 psi.
Any suggestions would be appreciated.