Re: Looking Low Weight Engine Kit
My two builds so far have been about pedal-ability and light weightness.
The four largest gains I think one can make with the China Girl kits- if you chose that- are:
1. Eliminate the chain tensioner- I use a cruiser frame with pretty wide rear seat stay clearance- unfortunately i think a mountain bike may be a bit harder to get rid of the tensioner- but I've never tried
2. Use a 415 Trike/ Industrial chain- only about HALF the weight of a standard kit chain- and ROLLS BETTER too with smaller plates- helps BOTH the motor and for peddlin.
3. Use a smaller alloy motor sprocket
The smaller the motor sprocket- the less weight it is and the less links the chain is- when you use a 36 or 34 sprock with NO tensioner, you can take out iNCHES of motor chain links. Depending on your riding style and the bike- so light narrow rolling wheels and tires are what I like.
Outside of the motor the heaviest pieces are the tensioner (gone), the motor chained (halved), and the motor sprock and rag joint- (less than halved while still ragged and way less than halved directly bolted to the hub with titanium)
4. Use a smaller tank- the smaller of the two sizes is only a slight dif empty, but the weight of gas really adds up fast- depending on how far you ride and how easily you can get gas. Mc Donalds is tried and true for that!
Another thing- slightly more cost- but don't discount it- TITANIUM BOLTS-
You'd be surprised how many bolts you can replace in a motor- but you may spend another 40 or 50 dollars to do it all- still they are really clean looking allen bolts that reduce the need for a lot of screwdrivers Also titanium on rag joint/ motor sproket bolts- I have a build with a 34 alloy sprock bolted directly to a high flange flip flop hub with small 5 mm TITANIUM bolts- The RAG JOINT is TOTALLY eliminated.
It's a 700c wheel that feels like a featherweight road bike wheel but still 36 spokes and about a 1 1/4 inch profile worth of rubber.
I'm not sure what the weight of my kits are under the stock weight- but it's a considerable chunk- and I've generally yet only replaced the clutch and cover bolts with titanium- two motors I think cost about 20 dollars so far
Last edited by Nashville Kat; 10-06-2012 at 09:23 PM.