Application of brake levers and lights

[arkives1]

application of brake lever and lights

Yes Steve, I did make the jackshaft. it's separate from the motor mount. It uses a 5/8" shaft, sealed bearings set in a 1 1/4" pipe welded to a sliding mount which has jack screws on the rear end for chain tension adjustments. The gearing is 10t on the engine, 22t freewheel (not needed to freewheel) to a 10t sprocket on the right side that directly drives a 5 speed freewheel on the wheel. The gearing there is (high gear to low) 14t, 17t, 21t,26t, 28t. It has good hill climbing but is quite slow in low gear, about 14 mph. 31 mph in highest gear. Speed is calculated with no load so are a bit higher that actual.Bike rides nicely, steering is tricky with the ape hangers and front raked wheel. The freewheel going to the pedals is a 20t and I can barely move the bike pedaling. A smaller freewheel there would help a bit. With the seat set back like it is I found it a bit tricky to find the pedals from a dead stop at times, feet dangled til I found one of them. So far I have not tried to do a wheelie.
The turn signals are scooter lights and I want to convert them to led but the bulbs to do so are about 17$ each so forget it! This bike was not an easy build.
Woody

 

[AussieSteve]

Well done. I don't have much equipment, so took the easy way out and bought a SBP shift kit.
Our 1st gear ratios are similar, I get about 12mph, but my 6th is much higher than yours, about 50mph. (52mph measured on a slight downgrade.) Don't want to go that fast, but it makes a good overdrive. Accelerate in 2nd to 4th, then into 6th to cruise at near idle.
My ratios are 10T engine to 17T jackshaft, then 10T jackshaft to 44T chainring, then 36T to 14T-34T rear cluster.
To help with kick-starting, I'm changing to 10T>17T, 11T>36T, 24T>14T-34T rear cluster. Lower start ratio, higher gearing to the chainring then low gearing to the rear to compensate. The downside is that the chainring will spin faster and I couldn't keep up by pedalling if I tried. (I never try.)

 

[arkives1]

Steve,
I don't try to pedal either but could if necessary. The pedals keep it legal as a motorized bike, remove the pedals and it becomes a motorcycle and then must be registered and licensed etc, plus it would then require a motorcycle operators license.
I use a pull starter and a centrifugal clutch on mine, works great with the c-clutch, just ease the throttle a bit and shift, a bit touchy on shifting back down, which I forget to do sometimes, but do most of my riding in 4th gear and it will start from a dead stop with the c-clutch. Just wont work on a hill.
I ran into chain alignment issues if I used the SBP kit, that was because of the engine mount and that mount wouldn't allow the standard shift kit anyway. I'm now putting a shift kit on one of my cruisers with a similar set up. On that one I'm going 10t-17t-8t-44-36 then 14t-18t-21t-26t-32t giving me about the same speed range as the chopper but with a 26" wheel I need more torque for the steep hills here.
I have not been able to kick start any of my engines, they're all 80cc slant head PowerKings and have quite high compression. It sounds like your plan will work for that so I may steal the idea.
Woody
Woody

 

[AussieSteve]

I can still pedal mine, but only if the engine isn't revving too high, otherwise I can't keep up. when I see a cop I turn the pedals a bit, but it's only simulated pedalling.

My 66cc has a billet head and very high compression, but it's not hard to kick-start on the centrestand. 2 kicks cold, (one with choke, then one without), or one when warm.
I set the RHS pedal at 2-3 o' clock then one good push to 6 o' clock does the job.

The new ratios will make it about 1/3 easier to kick-start and the overall final ratios will be a little lower than they are now, with a top speed in 1st of about 10mph and 45mph in 6th.

The gear cluster I fitted is a 6-speed Shimano MegaRange 'SuperLow' 14-34. Like you, I want heaps of torque in 1st.

 

[arkives1]

Steve,
What max engine rpm are you calculating from? Powerking engines have a max rpm of 6000 rpm. Given the 4.1:1 gearing that gives me a max speed of 1463 rpm on the 10t power out sprocket. It may be possible to rev these engines faster than 6000 but it would be screaming. With that 34t sprocket you should be able to climb trees or poles!
Woody

 

[AussieSteve]

My engine revs to 7500, Woody, in the lower gears at least. It needs a downhill to rev that high in the higher gears. About 6000 rpm until I fitted the billet head and SBP air filter, jetted down to 0.72mm, port-matched etc.

I calculate RPM from an accurate speed reading using JPilot's gear ratio calculator.
More info, calculations etc, is in this thread:- SBP Shift Kit - Ratios, Speeds and Pedal-starting
N.B. The MegaRange SuperLow gears came after I started this thread.

Yep, I could climb a wall with my gearing, especially when I change to a 24T chainring driving the rear cluster.

Correction, my engine revs to 7400, not 7500.
Also, my cluster is 13-34, not 14-34 as I said. (Failing memory)

 

[Fabian]

Ok, here is what's happening in Mildura,

A kid was on his motored bicycle, riding down the road; not pedaling.
Have a guess what's happening now?

The Mildura police are seeking clarification from Vicroads as to the legality of his motorised bicycle, as they've already given him a ticket for driving an unregistered vehicle and unlicensed driving.

This one kid may very well have f*&ked it up for all of us in Victoria, as once the police have clarification, they'll be slapping fines and confiscating petrol powered motored bikes, left, right and centre.

If the idiot only pedalled his motored bike at all times, things may have stayed under the radar.

Fabian

 

[AussieSteve]

If the idiot only pedalled his motored bike at all times, things may have stayed under the radar.
Fabian

Now you're just being silly. Do you pedal at all times?
I certainly don't and couldn't if I wanted to. I think that the majority of people here don't pedal all the time.
For health reasons, I can't pedal all of the time. If I could, I wouldn't need an engine.

 

[Fabian]

Yes Steve, i pedal at "ALL" times.
On longer journeys, i get leg cramps because it's a lot harder to pretend pedal, than to apply load pressure through the pedals.

Murphy's law states: the moment your not pedalling, there will be a police officer behind you to issue a ticket for a non compliant motor vehicle.

Pedalling at all times, Steve.

Fabian