Thud wrote:fileing a key to fit the odd keyway to fit is quick & easy.
(we advance the timing on lawnmower engines by offsetting the key a bit.)
Njay wrote:Thanks guys! So far the surpluscenter was the closest... excellent prices... unfortunately, the shaft's keyway is 1/4 and they don't have 7/8 bores with 1/4 width keyways , only on the next bore diameter size (15/16).
Njay wrote:There are a number of suppliers here in europe for rear (wheel) sprockets specifically for my bike, so I'm planning on using those instead of trying to order custom. 11 tooths drive sprocket is my initial guess, but since it's a guess I'd like to try a 10 and a 12 to see what's best. Custom machining here is basically out of the question, even simple jobs are just too expensive.
Well, 1/4 is what the tech drawings show, I haven't do any measurements but now I will. And it seems I'll have to measure the chain too to be sure about what I have. But I've been looking and yes it loos like the #50 really is 530, and my bike takes a 520 :/. Thanks for the hints frodus.
frodus wrote:You will want something higher than a 4:1 on a B&S etek. I don't know of anyone that goes with lower than 5:1 on that motor. I wouldn't go that low because it'l pull a ton of current and cause overheating. If it's a super light bike with low range, it might be ok. But if it's a decent range bike, the weight and that gear ratio is a little on the low side. You should have something in the 55-66 tooth range, 43 is way too low, IMHO.
frodus wrote:And it doesn't matter what the chain is, you'll be throwing the original chain out and getting your own. The original will be too short. The motor will be in front of the pivot, further forward than the original front sprocket, so the new placement will require a longer chain.
frodus wrote:Where are you getting your sprockets?
Where are you located?
frodus wrote:light would be under 200lbs
frodus wrote:I doubt you'll get over 50mph with 48V, even with the gearing you want. Start considering 60V, that will help.
frodus wrote:Or consider talking to John Fiorenza at Motenergy. He designed the original B&S.... he's a great guy and very helpful. Don't take our word for it, take his.
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