Carburettor application to Mitsubishi 50cc
08-09-2004, 11:56 PM
#1
Junior Member
Thread Starter
Join Date: Aug 2004
Location: Istanbul,
MB, TURKEY
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Carburettor application to Mitsubishi 50cc
I started to convert a Mitsubishi 50 cc tree-dusting backpack engine to install on my 1/3 size Bucker Jungmeister.
In the first place, I made the necessary modifications (cutting down the front end on a milling machine, making
a prop adapter etc.) and ran the engine on a test stand with a 22 x 6-10 wooden prop. The performance was more
than satisfactory, it turned 7800 rpm. The only problem was with the carb. It was designed to work upright only
and you had to run 3 lines to the tank. I decided to replace it with a suitable Walbro. Now, which Walbro can I use?
The original carb is an old motorcycle type with a horizontal passage of 16 mm diameter and an up-down sliding
cylindrical barrel for throttle. Help will be appreciated.
In the first place, I made the necessary modifications (cutting down the front end on a milling machine, making
a prop adapter etc.) and ran the engine on a test stand with a 22 x 6-10 wooden prop. The performance was more
than satisfactory, it turned 7800 rpm. The only problem was with the carb. It was designed to work upright only
and you had to run 3 lines to the tank. I decided to replace it with a suitable Walbro. Now, which Walbro can I use?
The original carb is an old motorcycle type with a horizontal passage of 16 mm diameter and an up-down sliding
cylindrical barrel for throttle. Help will be appreciated.
08-10-2004, 01:14 AM
#2
Senior Member
My Feedback: (4)
Join Date: Jul 2002
Location: Somewhere,
DC
Posts: 9,825
Likes: 0
Received 0 Likes
on
0 Posts
RE: Carburettor application to Mitsubishi 50cc
A Walbro WT76A will be a perfect match, it's used on most 3.2 engines...
What did the engine weigh after conversion ?
What did the engine weigh after conversion ?
08-11-2004, 05:33 AM
#3
Junior Member
Thread Starter
Join Date: Aug 2004
Location: Istanbul,
MB, TURKEY
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
RE: Carburettor application to Mitsubishi 50cc
Thanks for the response. I checked Zenoahs and found that 48 and 62 use Walbro HDA48. I have bought a WT131 but the throttlr arm seems to be a difficult task.
The engine is not finished yet. The prop adapter is steel. I will design and make a lighter one from aluminum (hard). I ran it with the original carb and silencer. Whwn all is done, it should weigh approx 2 Kg. How is that for weight? Also, it ran on the test bench on its own magneto ignition with a heavy magnet flywheel. I think something can be done there about weight reduction, such as electronic ignition.
The engine is not finished yet. The prop adapter is steel. I will design and make a lighter one from aluminum (hard). I ran it with the original carb and silencer. Whwn all is done, it should weigh approx 2 Kg. How is that for weight? Also, it ran on the test bench on its own magneto ignition with a heavy magnet flywheel. I think something can be done there about weight reduction, such as electronic ignition.
