my new build shopping list!

I've never seen a flexible exhaust before that could be very handy
Any one ever use one?

I've seen flexible electrical conduit used before, didn't know they marketed it for bikes. Your list looks good, what is it going on?

That flexible exhaust is junk in my opinion, to restrictive and will kill performance and top speed potential, for less money the sick bike parts expansion pipe is a much much better option..... these engines will only get there best performance with a free flowing exhaust and the expansion pipe exhaust will give your bike a much better sound also.

Lots of gimics on ebay buyer beware.....

Best wishes with your build lots of reading on here and asking questions and you'll find out from the experienced what works and what doesnt, you will get some differing opinions on a few things but some things are just facts plain and simple and most all of us are more than willing to try to point someone in the right direction so they dont waiste their money on some of the stuff that is just fluff.

Map

mapbike said:

That flexible exhaust is junk in my opinion, to restrictive and will kill performance and top speed potential, for less money the sick bike parts expansion pipe is a much much better option..... these engines will only get there best performance with a free flowing exhaust and the expansion pipe exhaust will give your bike a much better sound also.

Lots of gimics on ebay buyer beware.....

Click to expand...

I agree, the SBP expansion pipe is a far better option than the flex pipe for about the same price.

My only tip is that if you are going to lengthen your exhaust system with mix and match parts, research expansion chamber tuning information. There is a special relationship between the length of the exhaust pipe and expansion chamber. Also the angle of the expansion and the angle that closes at the outlet have a lot to do with the way sound waves help cycle the motor as efficiently as possible...

Going2Hell said:

My only tip is that if you are going to lengthen your exhaust system with mix and match parts, research expansion chamber tuning information. There is a special relationship between the length of the exhaust pipe and expansion chamber. Also the angle of the expansion and the angle that closes at the outlet have a lot to do with the way sound waves help cycle the motor as efficiently as possible...

Click to expand...

Good advise and all true, but if someone doesnt have the tools or the know how to build a custom expansion chamber exhaust its not gonna be very helpful, a wide open exhaust is better than a nice looling custom exhaust that is restrictive in my personal experience, the sbp expansion exhaust isn't perfect but offers a noticeable performance increase over any of the stock type set ups and is a very simple exhaust to install on most bikes, I dont use the silicone tubing myself and se. Copper fittings in their place which is a bit restrictive but still works greaton a mild engine build and performs great from low end to 30+mph ever with my 200+lb self and a 36T rear sprocket on a 26" wheel.

There are lots of options but for a novice who doesnt have a boat load of tools and access to a torch and mig or tig welder the sbp exhaust is an excellent choise.

Map

If you want stock type performance just stick with the stock pipe, no reason to spend an extra $90 for no more or less performance, build it how you want, its your bike, just speaking for experience when I give advice on these things but if you hqve the money to waiste and or spend then go ahead with the flex pipe exhaust, all it will do is be mounting a stock type muffler in a different location and because of the pipe length make acually add to the overall restriction, but if you just want a putt around bike for quieter low speed riding either of those pipes will do stock or the flex exhaust.

Best wishes on your build.

Map

For the fuel line, all i did was go to a shop and ask for 8 inches of 1/4 inch line. It's so small you'll probably get it free. with my build I followed the same procedure, replace the crap and reliability comes with. that's what makes a good motorbike. the throttle, i added a spring to the carb to increase throttle return. I didnt have probs with my tank. the tensioner, that's a piece of work aint it? i bought aftermarket bolts and torqued to 100 ft/lbs. not nice to the frame but my tensioner hasn't moved...

A simple and affective way to keep the stock type idler tensioner from possibly rotating into spokes is to do as myself and several other have done is once ther tensioner bracket is installed on the frame in the desired location just drill a small hole though tensioner bracket where it saddles the frame and the install a small self tapping sheet metal screw with some blue thread locker on it, it will cut good threads through bracket and frame in that area and the hole is so small and the fact that the bracket itself clamps tightly around the frame on both sides of the small hole makes it actually just as strong as if there were no hole there at all, it doesn't compromise the strength of the frame and will insure that the idler bracket stay put and can not rotate into the wheel spokes.... very simple mod and it just simply works great if you plan to run the stock type tensioner/idler set up, just make sure the hole you drill is correct for the screw thats used And its A solid solution and will not come out, got one bike that is set this way since 2009 and it has never been touched since I put it together this way, over 2000 miles of abuse and I have only replace the roller with the one I make from skateboard wheels which are way better than the one that come in kit.

Map

My advice is save on 'accessories', and invest in a better motor, one with a balanced 40 mm stroke.
Then a decent pipe.
This is were you will get the power to blow off a cheap kit.