139qmb Stroker Crank Discussion

[jmkjr72]

you have to watch what you get for a lawn tracter battery fleet farm around here offers 2 now one that is 100 cca and the other that is 200cca
then you have to worry that it wont fit right and its larger and heavier

www.batterystuff.com/batteries/scooter/

and some of the proper batteries dont cost much more then a good lawn tracter battery

[Deleted]

again....a 12cca battery? do you mean 120cca?

[larry001964]

Dec 24, 2011 18:39:13 GMT -5 stroker said:

again....a 12cca battery? do you mean 120cca?

Got it, had to do some research on that one, lol the batteries are averaging 180 to 220 cca

[Deleted]

all qmb starters are not created equal either. my 82cc was having trouble spinning over. I eliminated a quick connect in the cable and made the cable shorter and that helped to get more amps to the starter but it still drug sometimes. i put a different used starter on it and it spins over much better but still has a little drag sometimes. a NEW starter with bigger gauge cables and a stronger rated cca battery should be a 100% fix. After all, big motorcycles spin over find on the same cca batteries as the ones im looking at (120cca and above)

[larry001964]

Dec 24, 2011 19:25:39 GMT -5 stroker said:

all qmb starters are not created equal either. my 82cc was having trouble spinning over. I eliminated a quick connect in the cable and made the cable shorter and that helped to get more amps to the starter but it still drug sometimes. i put a different used starter on it and it spins over much better but still has a little drag sometimes. a NEW starter with bigger gauge cables and a stronger rated cca battery should be a 100% fix. After all, big motorcycles spin over find on the same cca batteries as the ones im looking at (120cca and above)

That's kinda what i was thinking, wondering if I can adapt a starter from a 150.. that should be enough...

Here's the battery I'm liking thanks jmkjr72
www.batterystuff.com/powersports-batteries/sYTZ14S.html

[Deleted]

Dec 24, 2011 19:32:07 GMT -5 larry001964 said:

Dec 24, 2011 19:25:39 GMT -5 stroker said:

all qmb starters are not created equal either. my 82cc was having trouble spinning over. I eliminated a quick connect in the cable and made the cable shorter and that helped to get more amps to the starter but it still drug sometimes. i put a different used starter on it and it spins over much better but still has a little drag sometimes. a NEW starter with bigger gauge cables and a stronger rated cca battery should be a 100% fix. After all, big motorcycles spin over find on the same cca batteries as the ones im looking at (120cca and above)

That's kinda what i was thinking, wondering if I can adapt a starter from a 150.. that should be enough...

Here's the battery I'm liking thanks jmkjr72
www.batterystuff.com/powersports-batteries/sYTZ14S.html

i dont see the need for a 150 starter and i dont think that can be done anyway. that battery and some big cables should be just fine

[Deleted]

continued from:

49ccscoot.proboards.com/index.cgi?action=display&board=4perfrom&thread=55&page=8

Yeah I rode about 100 miles last night and I was thinking an oil temp sensor and gauge would be wise on this combo. we used to put them in Bug motors but for the life of me a cannot remember where. Maybe Jeremy remembers. If not I can dig through my 15 yrs worth of VW archives. A scooter motor and an air cooled VW motor are almost like family in their design so I am trying to apply what I learned on those to this application and the biggest thing that stands out in my mind is cooling. If it was a water cooled motor it would be less on an issue and its not even warm out yet.

[Deleted]

I was thinking about your jetting too. I saw you started out with a #95 then went to #98. my 82cc runs a #98 in winter and plugs look dark brown. Lean motors run hot so I would give that motor as much gas as it could handle. #98 for that motor seems lean to me. On this motor I would want to be on the rich side.

[larry001964]

98 main, with carb needle clip in lowest position. Plug chop shows chocolate brown in color, but will check it again tomorrow. Im at work posting with my smart phone, so forgive my short answers. :-)

[Deleted]

give it more, it needs the richest possible jetting. go bigger till the plug is black and it starts to run bad then back off a little. IMO the mindset needed for this motor should be how to eliminate or cut back on heat sources on every single part. lowering the compression as you talked about before is going to help a great deal too.

[larry001964]

Just bought a honing tool today, have to order two sets of gaskets and new rings. Lowering the compression is a done deal IMHO. I'm sure it will help the starting problem. Guess I should get a jet set. I'm making my list for Enviormoto. LOL


Will admit I miss it not being a 72 some days. But driving it up hills or in heavy wind, I just love it.

[larry001964]

Well Guys, and Gals I seem to have ironed out most of the problems I've had with the stroker crank.
The last two days I have driven over 168 miles with no issues. Took off the CVT cover and every thing looks very good...

I should also note that probably a 150 cc would be cheaper, but this project was fun to figure out.. Still have some fine tuning to do, but over all it's pretty much done. It's really a pleasure to drive, plenty of power, robust and responsive, still going to take apart the upper half and add a second base gasket, but this is really more to aid starting more than anything else..

I promised Jeremy I would post a parts list so that others can build kits without going thur the trial and error and $$$ to make this work. So Ill be posting that in a few day's.

[Deleted]

Mar 15, 2012 10:42:39 GMT -5 larry001964 said:

Well Guys, and Gals I seem to have ironed out most of the problems I've had with the stroker crank.
The last two days I have driven over 168 miles with no issues. Took off the CVT cover and every thing looks very good...

I should also note that probably a 150 cc would be cheaper, but this project was fun to figure out.. Still have some fine tuning to do, but over all it's pretty much done. It's really a pleasure to drive, plenty of power, robust and responsive, still going to take apart the upper half and add a second base gasket, but this is really more to aid starting more than anything else..

I promised Jeremy I would post a parts list so that others can build kits without going thur the trial and error and $$$ to make this work. So Ill be posting that in a few day's.

Awesome
Sure a 150 might have been cheaper money wise but you cannot buy this kind of satisfaction!

[larry001964]

Mar 15, 2012 23:59:04 GMT -5 stroker said:

Mar 15, 2012 10:42:39 GMT -5 larry001964 said:

Well Guys, and Gals I seem to have ironed out most of the problems I've had with the stroker crank.
The last two days I have driven over 168 miles with no issues. Took off the CVT cover and every thing looks very good...

I should also note that probably a 150 cc would be cheaper, but this project was fun to figure out.. Still have some fine tuning to do, but over all it's pretty much done. It's really a pleasure to drive, plenty of power, robust and responsive, still going to take apart the upper half and add a second base gasket, but this is really more to aid starting more than anything else..

I promised Jeremy I would post a parts list so that others can build kits without going thur the trial and error and $$$ to make this work. So Ill be posting that in a few day's.

Awesome
Sure a 150 might have been cheaper money wise but you cannot buy this kind of satisfaction!

Thanks 1Fast, I em proud of it..
I think you will be very happy with your build. I've driven 82 cc, but this just don't compare, wait till you get yours done and you will see what I mean... Your going to love it...

To be totally honest, after work me and a couple other guys there that have 150's raced, ( I know i should not have done it but couldn't resist ) to their surprise I really held my own quite well ( The look on there face's was priceless )... They did have better takeoff but not by much, they were never more than a half a scooter length ahead of me, and before the end of the road we were dead even, just had to quit accelerating and stop we ran out of road... Not Bad...

I have also noticed the engine is now coming into it's own, as I get more of that torque to the rear wheels my mileage goes up, also I think not have to do 10 min winter warm ups is helping that figure. Will lose a little as I'm going to upjet to a 100, as soon as the jet arrives, and change over to full synthetic oil, at least until I put that other base gasket in, then Ill have to go thru the break in process all over again...

[Deleted]

i wouldnt put synthetic in it till i had a couple thousand miles. the rings need time to run in with the dino oil.