AussieSteve
Active Member
I've been thinking a lot about which mods would best suit these engines. (66cc HT)
Most of us have a fixed single gearing, so the engine needs to have good torque/power throughout the entire rev range. Fast acceleration is not an issue. (We'll never achieve that.)
A couple of the biggest faults are the bucking and surging at very low RPM and the difficulty of slipping the clutch to take off smoothly when the engine is running, especially at higher gearings with 40T or 36T rear sprockets. Lower gearing would help, but only at a cost of top-end speed.
A heavier flywheel would minimise both problems. This is what makes a 2-stroke trials bike work so well. (Better than 4-strokes)
I found this:-
http://victorylibrary.com/tech/inertia-c.htm
On the downside, the engine wouldn't rev out as quickly and would be a little harder to get spinning when starting.
I'm wondering how much extra weight might be needed to make a noticeable difference.
Any thoughts?
... Steve
Most of us have a fixed single gearing, so the engine needs to have good torque/power throughout the entire rev range. Fast acceleration is not an issue. (We'll never achieve that.)
A couple of the biggest faults are the bucking and surging at very low RPM and the difficulty of slipping the clutch to take off smoothly when the engine is running, especially at higher gearings with 40T or 36T rear sprockets. Lower gearing would help, but only at a cost of top-end speed.
A heavier flywheel would minimise both problems. This is what makes a 2-stroke trials bike work so well. (Better than 4-strokes)
I found this:-
http://victorylibrary.com/tech/inertia-c.htm
On the downside, the engine wouldn't rev out as quickly and would be a little harder to get spinning when starting.
I'm wondering how much extra weight might be needed to make a noticeable difference.
Any thoughts?
... Steve