graydog8josh
Member
I rebuilt my first motor assisted bicycle last week with some different parts and last year's DAX motor with 3 out of 4 head studs helicoiled. Here's the scoop:
Schwinn Hi Timber(same old bike) 21spd mtb:
26" 1.95 front and rear kenda semislicks thornproof in front and slime rear, one of my slimes broke
36T sprocket from (boygofast) i donno if they're still around
w/ #41 chain from (tractor supply)
(skipu) spring tensioner with 10t idler gear ebay
(Thatsdax) 66 cc motor no porting or modifying of ports in any way
(arrowmotorizedcycles) reed block
crmachine stage 2 head(via arrowmotorized cycles but from crmachine)
NGK bp8hs plug
RT carb(thatsdax) with 60 jet(sickbikeparts)
(arrowmotorizedcycles) torquer2 exhaust
87 octane gas with 10% ethanol (yuck, i was in a pinch, ethanol runs funny and smells bad)
ipone strawberry scented scoot city synthetic oil 36:1(scooterworks)
right now ive topped out at about 30 mph and i can pull 33 but it runs very rough at that speed. Im looking at other posts and thinking about using some more aggressive parts, but right now this is my business model as im trying ot build more bikes for more people around me.
I really like the RT carb now that ive got one that doesnt leak, my first one i messed up it the float and or the bowl gasket andit leaked all my good Hi octane ethanol free gas down the drain in a few days
I really like the skipu tensioner but mine is getting worn and i need to rebuild it, it is starting to lean in.
I also really like the crmachine head it keeps me worry free about overheating the head too bad.
Im thinking about doing a few things but im not sure what to try first:
1: switch to 93 octane ethanol free. I know these engines arent meant to run with ethanol and im concerned that i am not getting the full potential with cheap gas also this is the easiest change i can make
2: move up to a dellorto 19mm pbhg carb(sp?) I have one i ordered but i dont have any idea where to start with tuning, i just bought one because i saw crmachine running one in a video on his website
3: I have a arrow boost ported cylinder body that came with my reed block, i was avoiding using it at first because i wanted a baseline from which to see where my RT carb was running well. I know the exhaust port is considerably wider and i was planning on moving right back to a 70's jet and then jetting down.
I dont know ill probably follow up on this post what i did in what order but i really want to try to have a systematic approach so i can see the power increase. I miss going 40mph every day. Now that ive ditched the nt carb i think ill be able to ride 40 without being afraid of starving the engine. I might even switch to a 32T sprocket i have laying around, the RT carb has no problems taking off from idle.
Schwinn Hi Timber(same old bike) 21spd mtb:
26" 1.95 front and rear kenda semislicks thornproof in front and slime rear, one of my slimes broke
36T sprocket from (boygofast) i donno if they're still around
w/ #41 chain from (tractor supply)
(skipu) spring tensioner with 10t idler gear ebay
(Thatsdax) 66 cc motor no porting or modifying of ports in any way
(arrowmotorizedcycles) reed block
crmachine stage 2 head(via arrowmotorized cycles but from crmachine)
NGK bp8hs plug
RT carb(thatsdax) with 60 jet(sickbikeparts)
(arrowmotorizedcycles) torquer2 exhaust
87 octane gas with 10% ethanol (yuck, i was in a pinch, ethanol runs funny and smells bad)
ipone strawberry scented scoot city synthetic oil 36:1(scooterworks)
right now ive topped out at about 30 mph and i can pull 33 but it runs very rough at that speed. Im looking at other posts and thinking about using some more aggressive parts, but right now this is my business model as im trying ot build more bikes for more people around me.
I really like the RT carb now that ive got one that doesnt leak, my first one i messed up it the float and or the bowl gasket andit leaked all my good Hi octane ethanol free gas down the drain in a few days
I really like the skipu tensioner but mine is getting worn and i need to rebuild it, it is starting to lean in.
I also really like the crmachine head it keeps me worry free about overheating the head too bad.
Im thinking about doing a few things but im not sure what to try first:
1: switch to 93 octane ethanol free. I know these engines arent meant to run with ethanol and im concerned that i am not getting the full potential with cheap gas also this is the easiest change i can make
2: move up to a dellorto 19mm pbhg carb(sp?) I have one i ordered but i dont have any idea where to start with tuning, i just bought one because i saw crmachine running one in a video on his website
3: I have a arrow boost ported cylinder body that came with my reed block, i was avoiding using it at first because i wanted a baseline from which to see where my RT carb was running well. I know the exhaust port is considerably wider and i was planning on moving right back to a 70's jet and then jetting down.
I dont know ill probably follow up on this post what i did in what order but i really want to try to have a systematic approach so i can see the power increase. I miss going 40mph every day. Now that ive ditched the nt carb i think ill be able to ride 40 without being afraid of starving the engine. I might even switch to a 32T sprocket i have laying around, the RT carb has no problems taking off from idle.
