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In addition, the OldMiniBikes sprocket/drum does not lay flush with the OEM Bonanza rim or the Azusa 5" rim I got from OldMiniBikes. Too small for the OEM and too big for the Azusa.

markus, you are correct. The drum I got from OldMiniBikes is indeed 5", but will not work. The pre-drilled holes would have to be filled and new ones put in. There was no way to drill new holes without being mm's from an exsisting one. BTW, the one I got is NOS and really shows it's age. It was worth a...

CarPlayLB, I'm not sure if you got my question yesterday. I already have a new tire, rim, and chain all from OldMiniBikes. They sold me the 4.5" drum by mistake a while back. I will buy this 5" drum asap if it works with my set-up. I just don't know what a bendix break is. I'm confused thinking...

Ok. Did he get my message or is it just in the thread until he looks?

Greg, is that the OldMiniBikes one that CarPlayLB mentioned?

Pardon my inexperience but does that drum/sprocket work with the 5" drum brakes? I installed the new pads months ago and discovered the root cause. Thanks.

Hey everybody. I've looked up and down for a 5" drum with flange for my Bonanza with no luck. The one on now is slightly bent and makes the chain fall off at speed. Any ideas? Thanks.

Hey everyone, I ordered a bunch of parts from OldMiniBikes this week and got the wrong drum/sprocket. Seems that they don't sell a 5" with flange although they have the drum (no flange) and the 5" brake itself. If it helps I got a new Azusa 6" Tri-Star wheel with the order, so that's what I need to...

Post #12

That's what I needed to hear. I'll keep everyone updated. Should a new thread be started or is this one fine? Thanks Dave.

So now I'm back to square one. Do I use a jackshaft, gear it so it's slower yet make the engine work overtime. If this is a matter of clutch burn I guess I don't mind going through a few until the boy can handle the bike. Do I save the money and go w/o the js and stock up on clutches? If this is...

Sorry for the confusion. I'll lay out my plan, this might be long. The bike is a 1970 Bonanza Scout MB300 (Scooterboy id'ed an identical one a few years ago). It has an H25 w/o a governor. 12T up front and 72T final drive. I'm putting a Honda (real one) GX160, 5.5 hp on in addition to new...

If the "T" numbers were 12 (clutch), 12 12 (jackshaft), and 72 final drive, my ratio remains 6:1. By changing the gear on the js running the final drive, it would fractionally change? Is that how people get odd ratios like 4.10:1? My question remains, what benefit does the js offer other than...

I guess I don't understand what the jackshaft accomplishes. Other than being able to line up gears, what is the benefit when I have 6:1 already? Are the two jackshaft gears the same size, if so what size? I don't mind spending the money for either a stock js (I think I would have to move the...

I'm not at all confident about buying the right gears. I have a T72 on the back rim and I believe a T12 up front right now. I plan on buying a new clutch (so the "T" may change) and a final drive if I need to. This is for my 7yr. old and I can't make a mistake. I understand there are four total...

I just got the exact same bike. Thank you for the info. The H25 is a 1970 on mine, the tank is black plastic (not original) but the Scout sticker is still on the clutch guard. I'm restoring it now.

Hey, I heard that running at 1/3, 1/2 throttle could burn the clutch quickly. The reason I ask is because that's where I want to start my son at. If there's a smarter way, please tell. The engine is a Honda GX160 (real one) 5.5hp. I will also be using a jackshaft.

Thanks for the heads-up. What's the best tire (regardless of size) for lawn/field traction? Assume a child (55-75 lbs.) is riding. I'm leaning towards the basic studded, they seem tried and true. Is there a rule of thumb about wheel clearance? Plenty of tires will fit but I need to buy the right...

Thanks

It's added to the list. Thanks.