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Post by steve on Jun 30, 2015 13:11:00 GMT -5
Alright, I dug in to that sucker today. This is NOT the same as the QJ139QMB. The QJ137QMB has the CVT case of the 2 stroke, but the CVT is NOT the 2stroke JOG Minarelli, Zuma, etc. Inside that 2T case is the variator, and clutch of the regular 139QMB. This scoot was a Keeway. It also has a 37mm piston. You cannot put a big bore on this motor. I kind of feel important posting this info.  Even Mo from scrappy's does not have the scoop on this motor. It is literally nowhere on the internet. |
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Post by dmartin95 on Jun 30, 2015 14:44:34 GMT -5
I wish more people took the time to share the kind of info you just provided. Thanks for sharing!
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Post by JerryScript on Jun 30, 2015 17:47:18 GMT -5
Agree, thanks for posting. If you think of it, would you mind measuring the head bolt spacing if/when you have the valve cover off?
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Post by tvnacman on Jun 30, 2015 20:03:53 GMT -5
What size BBK did you try?
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Post by steve on Jul 1, 2015 6:21:25 GMT -5
Oh, sorry. The bolt spacing is the same. You technically can install a BBK, you just have to bore the case. I did not have a tape measure, so I had to mark a stick. The 47 was pretty close, but it wouldn't fit. I'd bet you could fit a 44mm jug in there. It's a customer's scoot, so I don't have a ton of info on the engine, and I am not going to be able to really dig into it. But, I hope to save somebody some heartache with the info I do have. He didn't pay me to take it apart to see if a BBK would fit, I just decided to loosen things up and take a peek while I was doing the valve adjustment. He wanted better hill climbing. When I went over to his place to check the engine number, and look over the scoot, I saw the CVT case, checked the engine number, and went home to assess. I ordered the JOG/Minarelli/Zuma clutch spring, and variator weights. Then, yesterday, when I took the CVT apart, the stuff I bought did not fit. LUCKILY, I had a spring and some rollers from my scooter that would fit in his. I lucked out. I'm a 1 man operation, so that could have really put a hurtin' on me. I put a new carb on it. With the 37mm bore, I had a 72 main jet in there. I was not pleased with the performance gains from the CVT upgrades I added. So, I decided to go bigger on the main jet for the heck of it, while I was waiting for the CVT to cool down. I put an  main jet in there, and that thing LOVED the bigger jet. The performance increase was marked. That's pretty large for a 37mm bore, but I popped the 4-hole off of the air filter intake, and it was perfect. Really pepped that thing up. The larger jet really complimented the CVT upgrades well. I was pleased, and he was too. It has one of those valve covers that has the plug on the top and the bottom, to adjust the valves without having to take the valve cover off. The nuts on those plugs is around 1", and there is so little room to get a big wrench in there, that it's kind of impossible. Does anybody else have a scooter that, because of the frame, a valve adjustment is a HUGE ordeal? I think valve adjustments are the hardest thing I have to do, on the scooters that have frame pieces all in the way. It's a huge pain on some of them. |
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Post by pistonguy on Jul 1, 2015 8:21:42 GMT -5
so you just popped the head off and measured the Bore?
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Post by steve on Jul 1, 2015 10:21:51 GMT -5
Yes. But if you are asking if I did something dumb, and pulled the cylinder out, looked at the hole, and put it back, the answer is no. Already learned that the hard way.
I didn't take the cylinder out. I just loosened it, and raised the jug a bit. That 37mm jug is in there pretty tight. The normal 139qmb's have a good bit of room. This one doesn't.
I have a 47mm, and a 50mm cylinder that I compared.
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Post by lain on Jul 2, 2015 4:01:05 GMT -5
Oh, sorry. The bolt spacing is the same. You technically can install a BBK, you just have to bore the case. I did not have a tape measure, so I had to mark a stick. The 47 was pretty close, but it wouldn't fit. I'd bet you could fit a 44mm jug in there. It's a customer's scoot, so I don't have a ton of info on the engine, and I am not going to be able to really dig into it. But, I hope to save somebody some heartache with the info I do have. He didn't pay me to take it apart to see if a BBK would fit, I just decided to loosen things up and take a peek while I was doing the valve adjustment. He wanted better hill climbing. When I went over to his place to check the engine number, and look over the scoot, I saw the CVT case, checked the engine number, and went home to assess. I ordered the JOG/Minarelli/Zuma clutch spring, and variator weights. Then, yesterday, when I took the CVT apart, the stuff I bought did not fit. LUCKILY, I had a spring and some rollers from my scooter that would fit in his. I lucked out. I'm a 1 man operation, so that could have really put a hurtin' on me. I put a new carb on it. With the 37mm bore, I had a 72 main jet in there. I was not pleased with the performance gains from the CVT upgrades I added. So, I decided to go bigger on the main jet for the heck of it, while I was waiting for the CVT to cool down. I put an main jet in there, and that thing LOVED the bigger jet. The performance increase was marked. That's pretty large for a 37mm bore, but I popped the 4-hole off of the air filter intake, and it was perfect. Really pepped that thing up. The larger jet really complimented the CVT upgrades well. I was pleased, and he was too. It has one of those valve covers that has the plug on the top and the bottom, to adjust the valves without having to take the valve cover off. The nuts on those plugs is around 1", and there is so little room to get a big wrench in there, that it's kind of impossible. Does anybody else have a scooter that, because of the frame, a valve adjustment is a HUGE ordeal? I think valve adjustments are the hardest thing I have to do, on the scooters that have frame pieces all in the way. It's a huge pain on some of them. in a lot of 150cc's and other top mount engines the frame is often right in front of the valve cover making it impossible to mess with without removing the engine from the frame. The most recent I saw with that case was the BMS Palazzo 150 |
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Post by pistonguy on Jul 3, 2015 7:29:49 GMT -5
Yes. But if you are asking if I did something dumb, and pulled the cylinder out, looked at the hole, and put it back, the answer is no. Already learned that the hard way. I didn't take the cylinder out. I just loosened it, and raised the jug a bit. That 37mm jug is in there pretty tight. The normal 139qmb's have a good bit of room. This one doesn't. I have a 47mm, and a 50mm cylinder that I compared. Oh Ok. So when the Re-Used Head and Base Gasket Weep down the road aways Who Pays to Fix It? |
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main jet in there, and that thing LOVED the bigger jet. The performance increase was marked. That's pretty large for a 37mm bore, but I popped the 4-hole off of the air filter intake, and it was perfect. Really pepped that thing up. The larger jet really complimented the CVT upgrades well. I was pleased, and he was too.
