Can't freewheel in opposite directions. It's been a while since I've ridden the bike (it's in storage) but if I remember correctly you're right about compression braking as long as a clutch is locked up.
I guess I should have clarified. Knowing that freewheel sprockets will only transfer power in one direction, and also knowing that a lot of freewheel sprockets have a threaded attachment (obviously also only one way rotation lest you loosen the attachment threads by turning it in the wrong direction) I specified keyway style freewheeling one way sprockets as the keys at allows them to be installed in either direction.Can't freewheel in opposite directions. It's been a while since I've ridden the bike (it's in storage) but if I remember correctly you're right about compression braking as long as a clutch is locked up.
and that's where the freewheel sprockets setup for deceleration come in.Depends on how 2-speed is setup; with this one the power runs through a clutch in top gear. Top gear is just like a single speed. Freewheel is for all gears lower than top gear.
That’s not how this works. But if you can draw it, be interesting to see what you’re thinking.and that's where the freewheel sprockets setup for deceleration come in.
Thanks for posting the video. You seem to be quickly easing up on the throttle when you anticipate the second clutch engagement. Is that for a cleaner engagement?Depends on how 2-speed is setup; with this one the power runs through a clutch in top gear. Top gear is just like a single speed. Freewheel is for all gears lower than top gear.
Yes. It has already begun the shift. Depending on load shifting up, or engine braking slowing down, the shift speed can vary. It is a very natural riding setup that can easily be ridden with one hand.Th
Thanks for posting the video. You seem to be quickly easing up on the throttle when you anticipate the second clutch engagement. Is that for a cleaner engagement?
Thank you! That's both interesting and encouraging.Yes. It has already begun the shift. Depending on load shifting up, or engine braking slowing down, the shift speed can vary. It is a very natural riding setup that can easily be ridden with one hand.
Thank you for taking the time to share this information Curt. I've been all over the web searching for information on the centrifugal clutch where the bell spins with the shaft instead of freewheeling. I can't find a thing. Do you know what it's properly called so I can do a web search or where a person could buy one?Think there would be until you slow down enough for the second speed clutch to disengage then would be none.............Curt
How they work.
https://www.parduebrothers.com/minibike/twospeedthreechainminibiketransmission.pdf
That helped, thank you. Some of the most interesting information was here on motorbicycling.com including some of WayneZ's 2-speed v-belt drive ideas.I got all my info researching Rupp mini bike TT500 2 speed clutch.
The comet 2-speed possibly had that. The 2nd gear shift was based on engine speed not jackshaft (rear wheel) speed. Doesn’t really make sense to me but that’s how they did it. If you are looking for this to have your clutch on the jackshaft in a single speed setup, you can set it up with a regular clutch by driving the JS from the engine and bell output to rear wheel.Thank you for taking the time to share this information Curt. I've been all over the web searching for information on the centrifugal clutch where the bell spins with the shaft instead of freewheeling. I can't find a thing. Do you know what it's properly called so I can do a web search or where a person could buy one?
Here's my thoughts. If there's a ratio reduction from the clutch bell sprocket to the jackshaft (I'm referring to a ball bearing mounted shaft between the engine centrigul clutch and the rear wheel) and the second centrifugal clutch's mechanism, the second clutch needs more engine rpm to spin the jackshaft up to it's engagement rpm. Given that the driven sprocket will be freewheeling, when the jackshaft gets up to speed the second clutch takes over with it's ratio.The comet 2-speed possibly had that. The 2nd gear shift was based on engine speed not jackshaft (rear wheel) speed. Doesn’t really make sense to me but that’s how they did it. If you are looking for this to have your clutch on the jackshaft in a single speed setup, you can set it up with a regular clutch by driving the JS from the engine and bell output to rear wheel.
I was wondering if you remember where you got those oneway sprockets? and how did they hold up?Thanks harry, that's great praise coming from a builder like you. It turned out a little bulky but once in the frame it's like it belongs there.
I was wondering if you remember where you got those oneway sprockets? and how did they hold up?
Hey greggor. I found all the one way needle bearings on ebay and the sprockets at Mc Master Carr. I bought machinable sprockets and bored them to press fit the bearings into. I had a lathe where I worked at the time and was able to do the machine work. Check out Staton. They have a huge variety of sprockets, shafts, bearings, freewheels and adapters.I was wondering if you remember where you got those oneway sprockets? and how did they hold up?
Awesome Thank youHey greggor. I found all the one way needle bearings on ebay and the sprockets at Mc Master Carr. I bought machinable sprockets and bored them to press fit the bearings into. I had a lathe where I worked at the time and was able to do the machine work. Check out Staton. They have a huge variety of sprockets, shafts, bearings, freewheels and adapters.