A moped blog

Mopeds at Dawn is a collection of photos, videos and information on mine, and other peoples classic mopeds.

"Welcome to M.A.D, we hope you enjoy the blog and welcome any feedback. Please don't hesitate to contact us."

Sunday, 22 September 2013

First look at Marks Motobecane

 So today i thought id better take a look at our friend Marks moped. Its a Motobecane similar to the brown one Sinclairio has but this one has rear suspension.

 Before i could work on the engine i had to remove the aweful leg shields which was easy enough and also the engine side covers. Now that i could get access to the engine it was time to check all the usual suspects. First off i checked the spark plug and found that the plug boot had melted so it wasnt clipping onto the top of the spark plug. I replaced the boot with one from and old lawn mower which i had lying about. 
 Here you can see the condition of the spark plug from the look of it its been running rich which isnt really a problem but the gap was massive and the arm over the electrode was bent to one side. I replaced the plug with a new one. I checked and it was getting a spark. Next i drained the remains of fuel from the tank and flushed it through with fresh fuel and left a bit in there. Stared the bike but it was still running rough.
 The next thing i did was remove the carb which i noticed was mising its plastic cover and covered in crud. I broke it down and cleaned everything with carb cleaner and then reassembled. 

 Once i had done this the bike started straight up and with a slight adjustment to the idle screw it was idling perfectly.
 Finally i took the bike for a little test ride and remembered how slow these bikes are without a variater. 25mph top speed with a bit of a bog at low end.
So the next thing to do is do some plug chops and establish whether its running rich or lean then i can figure out how to adjust it so it wont bog down at low end.

No comments:

Post a Comment