AussieSteve
Active Member
One of the things needed on this site is a quick reference for engineering and tuning specifications, rather than having to search and sort through heaps of posts for lesser details.
I started a thread in the 'Forum Help and Suggestion Box' on this subject, A 'Specifications' section would be helpful. , and Tom suggested starting the specs thread here. If there's enough interest, he might make this sticky.
To benefit everyone, it would be good to keep this on-topic as much as possible and to avoid wild or off-the-wall recommendations.
What we need are 'factory' recommendations, specs, clearances etc.
Also clear illustrative pics of spark plug colours and procedures such as float level measurement and clutch adjustment would be good.
Copied from the above thread:-
A couple to start the ball rolling.:-
2009 HappyTime 2-Stroke Engine:-
Recommended spark plug (48cc and 66cc): NGKB6HS, (colder), or NGKB5HS, (hotter).
Spark Plug Gap (48cc and 66cc): 0.6mm, (0.024")
Recommended Fuel/Oil Mixture (48cc and 66cc):
Run-in: 16:1
Thereafter: 20:1
Compression Ratio (48cc and 66cc): 6:1
Compression, (measured):
48cc: ???psi - Anyone? (I'll edit)
66cc: 115psi
Max Power:
(These figures from ZBox Australia )
48cc: 1.2kW, (1.6hp), @ 5500rpm
66cc: 1.7kW, (2.3hp), @ 5500rpm
Bore x Stroke:
48cc: 40mm x 38mm
66cc: 47mm x 38mm
N.B. Capacity = pi * (Bore/2)² * Stroke. e.g. pi * (4.7/2)² * 3.8 = 65.9cc.
(Calculate in cm.)
Overall Weight:
48cc: 9kg
66cc: 9.5kg
NT Carburettor:
Bore: 14mm
Float level (48cc and 66cc): 21mm (Measured with carb upside-down and gasket removed, from gasket seating surface to highest point on float when float is held level)
Main Jet:
48cc: ??? - Anyone? (Again, I'll edit)
66cc: 0.7mm or 0.79mm
__________________________________________
Some carb tuning pointers might be good, too.
e.g.
Plug black, (mid-throttle settings) - lower the needle
" " , (3/4 to full throttle) - smaller main jet
Some sources of jets and so on:-
Range of main jets: Rock Solid Engines, (Australia)
Replacement (stock) Slide: thatsdax, (USA)
Replacement (stock) Slide Needle w/ 'C' clip: thatsdax, (USA) , Rock Solid Engines, (Australia)
... Steve
I started a thread in the 'Forum Help and Suggestion Box' on this subject, A 'Specifications' section would be helpful. , and Tom suggested starting the specs thread here. If there's enough interest, he might make this sticky.
To benefit everyone, it would be good to keep this on-topic as much as possible and to avoid wild or off-the-wall recommendations.
What we need are 'factory' recommendations, specs, clearances etc.
Also clear illustrative pics of spark plug colours and procedures such as float level measurement and clutch adjustment would be good.
Copied from the above thread:-
A couple to start the ball rolling.:-
2009 HappyTime 2-Stroke Engine:-
Recommended spark plug (48cc and 66cc): NGKB6HS, (colder), or NGKB5HS, (hotter).
Spark Plug Gap (48cc and 66cc): 0.6mm, (0.024")
Recommended Fuel/Oil Mixture (48cc and 66cc):
Run-in: 16:1
Thereafter: 20:1
Compression Ratio (48cc and 66cc): 6:1
Compression, (measured):
48cc: ???psi - Anyone? (I'll edit)
66cc: 115psi
Max Power:
(These figures from ZBox Australia )
48cc: 1.2kW, (1.6hp), @ 5500rpm
66cc: 1.7kW, (2.3hp), @ 5500rpm
Bore x Stroke:
48cc: 40mm x 38mm
66cc: 47mm x 38mm
N.B. Capacity = pi * (Bore/2)² * Stroke. e.g. pi * (4.7/2)² * 3.8 = 65.9cc.
(Calculate in cm.)
Overall Weight:
48cc: 9kg
66cc: 9.5kg
NT Carburettor:
Bore: 14mm
Float level (48cc and 66cc): 21mm (Measured with carb upside-down and gasket removed, from gasket seating surface to highest point on float when float is held level)
Main Jet:
48cc: ??? - Anyone? (Again, I'll edit)
66cc: 0.7mm or 0.79mm
__________________________________________
Some carb tuning pointers might be good, too.
e.g.
Plug black, (mid-throttle settings) - lower the needle
" " , (3/4 to full throttle) - smaller main jet
Some sources of jets and so on:-
Range of main jets: Rock Solid Engines, (Australia)
Replacement (stock) Slide: thatsdax, (USA)
Replacement (stock) Slide Needle w/ 'C' clip: thatsdax, (USA) , Rock Solid Engines, (Australia)
... Steve
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