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Post by 90GTVert on Oct 11, 2009 6:33:01 GMT -5
The cheapest scooters around here are $999 + 6% sales tax so buying local would be out. I don't even know if those have disc brakes. I really don't think anybody local is going to let me test drive a scooter either. Oddly enough, I think I'd want another 139QMB if I bought something different. I think it would be fun to work on if it would respond to mods. Something has to be off with the Sunl. I saw a thread over at SD a while ago with other people saying they put 70cc kits on and they still went 30-35MPH.
I'm gonna start a thread in the 2T section for discussion about a new Triton setup.
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Post by 90GTVert on Oct 11, 2009 9:19:01 GMT -5
I found some old mirrors so I wouldn't have to buy mirrors to sell the scoot complete. You can really see why I like bar end mirrors so much... With mirrors back on and the speedometer found the only way you can tell something happened is a little scuffing...
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Post by Enviromoto on Oct 11, 2009 10:17:06 GMT -5
Jeez. Sell this damned cursed sunl. Now you know why it was cheap.
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Post by erictheviking666 on Oct 11, 2009 11:16:31 GMT -5
My Scooter was one of those $500-$600 ones ($588). Mine would run around 35-37mph right after break-in. Now with some minor mods that I've done like an #85 main jet, drilled exhaust, and restrictions removed from stock airbox, I can hold 38-40 pretty easily (as long as there's no headwind) sometimes getting up to 42mph. I do have a high output coil but I'm still only running with 50cc's. So I guess it's kind of a crap shoot, you could get a good one or you could end up with a total dog. The problem is you don't know until you get it and break it in.
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Post by 190mech on Oct 11, 2009 19:04:40 GMT -5
I'd think that all of your mods would have brought it to life,could be gearing like enviro said..I remember how strong those little Honda XR75&80's would run.Kids would beat the crap out of them and they'd keep running..Rider weight didnt seem to matter either.Maybe the 139qmb is just 'engineered' slow?
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Post by 90GTVert on Oct 11, 2009 19:33:38 GMT -5
I dunno what it is. I kinda hate that I'm not gonna try some things I wanted to try, but maybe there will be another 139QMB project in my future.
Just an update on my father... He was hurting worse and said it felt like something moved when he walked or it just felt odd. He ended up getting a CAT scan and they found that his 4th and 5th ribs are broken. Now they say it will probably take about 6 weeks to feel better and the whole first week will be bad pain. He said people keep saying, "I bet you won't get back on that thing again." He responds with, "Don't be so sure of that." Yeah, he's one of us. lol
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Post by 190mech on Oct 11, 2009 19:46:16 GMT -5
Glad to hear your Pop has no more than a few busted ribs(thats enough!!)and that he wants to ride again.. I was rebuliding a Motofino 70cc engine and found the same type of pilot jet you mentioned;
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Post by 90GTVert on Oct 11, 2009 20:33:54 GMT -5
Yep, that's exactly the jet the 150cc carb has. I'd still like to pick up a 38 if I come across one.
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Post by 2strokd on Oct 12, 2009 9:15:51 GMT -5
I step away for one weekend and miss all the crazy. Sorry your dad went down, glad he will be ok. Your dad and mine sound alike lol. I think you should put a good 70 kit on T1 with the spacer that way you have more cyl options, like you have mentioned. I have been thinking allot about bb and stroker kits since my "bad day" Sat. but thats another thread.
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Post by 90GTVert on Oct 13, 2009 17:04:18 GMT -5
I pulled the engine apart and put it back together with the 47mm cylinder, 47mm head, ported stock intake, modded stock carb, stock cam, and the modded stock exhaust. I removed the Naraku vari and stuck in the stock variator with 8.3g rollers that came with the 70cc kit.
I took the Sunl for a 21 mile ride to see how it does in different conditions and to really assess whether it's worth keeping or not. In neutral wind on flat ground it will cruise at 33-34MPH. On a decline or with a tailwind it can cruise in the upper 30s. With a tailwind, on a downgrade, and tucked it went as fast as 42MPH. With a headwind I could cruise around 28-30MPH. On an incline with a headwind it bottomed out around 26MPH. I do think lighter rollers or a stiffer contra spring could aid that situation a little.
The handling is alright, now that I'm used to it more... but I can't say I feel that safe on it still. I did go down the road and take the turn my father crashed on at 30-35MPH or so, just to prove to him that committing to a turn is the correct way to do it and that it was possible to take the turn at the speeds he was going. I will admit 30-35MPH seemed a little shady on that scooter on that turn, but in reality it could be done 5-10MPH faster pushing it (or probably more if you are a pro, I'm sure not). I told him and he said, "So you went and tried to crash!?!" lol
The scooter is still a little fast-acting for my tastes. I like how nimble my 12" wheeled scooter feels compared to 16" wheeled scoots and big bikes, but the 10" wheels are a bit small for my tastes. Perhaps being such a big dude doesn't help there either. When my weight moves at all the scooter is going somewhere. It seems really susceptible to crosswinds as well. The winds today were around 5-10MPH and they were moving me around pretty well at times.
I have the same opinion on the brakes that I've always had... they suck. They work, but they leave a lot to be desired. Once again, if you weigh 140lbs the brakes will be a little better for you. At 280lbs the brakes take longer than I'd like to get stopped. They don;t have a good feel to them either. The rear drums on other scoots give you a bit of feedback. These brakes have to be squeezed hard and kinda make you feel like it's all or nothing sometimes. I can honestly say that there are some situations I've been in on my Triton that I wouldn't have gotten out of well if I had this kind of brakes. I've barely missed deer twice out here in the country and there is no way they would be near misses with the Sunl's brakes.
Even with that negative review, I did enjoy the ride when I was alone on back roads. I feel kinda silly if anyone is around. It's not exactly the coolest thing ever to be 6ft3 and 280lbs tucked down doing less than 40MPH on a scooter that is a tad small for an average sized person. I am going to try and take it out to a town that I like to ride in tonight if I can. I think it could be a good 25-30MPH in town scooter. The problem is, it's 10 or so miles each way to this town. I gotta try do it once anyway. Like I told my father, I put too much time and money into this scooter to never take a good ride on it. I don't care if it is a turd, I'm riding it a little before I sell it or seriously consider selling it. I'm pretty curious to see what sort of fuel economy the slow 4T boasts too. I get the feeling that's not what it should be either. We'll see.
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Post by 90GTVert on Oct 14, 2009 7:59:13 GMT -5
I switched over to 7.65g rollers and did a couple of transmission mods. I filed the variator face roughly 1mm to get a little more belt travel and to counteract removing .6mm off of the variator drive boss. Can't say any of that made much difference, but I might have picked up .5MPH or so. It's kinda of sad that a mostly stock setup is very similar to 2 different modded engine/transmission setups.
I rode about 50 miles last night and checked mileage twice. It's averaging 80.1MPG on 87 octane. That makes me wana a 4 stroke for myself. The 4T costs me about $0.03 per mile, while the 2 stroke running on premium and needing 2T oil costs me about $0.09 per mile. I've put over 5,500 miles on my 2T in about 6 months. Using these figures, I would have spent $495 on fuel for the 2T and only $165 on the 4T.
The 4T is fun in town where speed limits are 25 and 30. It gets boring on long stretches out of town doing 30ish though. It especially sucked going into a tailwind for 15 miles at 26-30MPH.
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Post by 90GTVert on Oct 19, 2009 22:18:29 GMT -5
I took the Sunl out the last two nights. Last night, I made it 10 miles and it started sputtering. I pulled over and it died. I realized it was leaving a trail of fuel, tried tapping the carb but couldn't reach it well and had no tools on me. Ended up coming home in the back of a truck. Turned out to be a stuck float.
Took it out tonight for 40 miles or so and had no problems. I will say this, it's 35 degrees here and I'm ready for spring again. lol
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Post by 90GTVert on Apr 12, 2010 22:16:55 GMT -5
There's been so much speculation about big bore kits larger than 47mm, and I've got a SunL that runs like crapL and leaks lots of oil. Why not do a little work in the name of science? I decided I wanted to do a 50mm big bore kit install. That seems to be pretty popular since the cases don't need cutting, or so I hear. I really have no idea how many miles are on this engine, so I thought to make this a fair test of crank issues with bigger kits I should have a fresh crankshaft. I should be receiving a stock crankshaft complete with new bearings any time now. I've already got a bunch of parts around that I need (from the last time I tried to make this thing go over 40MPH) so this really isn't costing that much. New crank, new seals, new gaskets, 50mm kit for about $175. The planned setup is... 50mm Big Valve Head NCY Cam 50mm Big Bore Kit from Enviromoto New Stock Crankshaft 150cc Carb And Intake UNI P&P Exhaust This thing is filthy from leaking oil. Found another problem. This is the second flat tire I've found in the last 2 days. These 4Ts are pretty simple compared to doing a 2T crank. I was expecting to need pullers and stuff. After I got the top end and accessories off it took 15-20min to remove the crank and it's the first GY6 I've done.
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Post by 190mech on Apr 13, 2010 4:33:09 GMT -5
Man!That thing leaks like an old Harley!Are you gonna install quality bearings?Even the stock '139'motors around here eventually have crank brg failure.One guy here changes his oil every 500 miles hoping that is the ticket..
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Post by 90GTVert on Apr 13, 2010 6:16:34 GMT -5
Part of me wants to install better bearings, but that wouldn't really prove anything for anyone wanting to bolt a kit on their stock engine. It's not that hard to do this, or at least pulling it apart wasn't. I can't speak for re-assembly yet. If it lasts 2,000 miles I honestly wouldn't be disappointed. Then maybe I could try better bearings and see if that makes a real improvement. The stock crank I pulled out seems to be in great condition. The crank would move back and forth in the cases a little, but it looks like that's just how these engines are setup. It pops in and out of the cases easily.
My first small engines (other than a kart when I was pretty young) were honda clone pitbike engines. Since I first owned those, not expecting any bearing issues really, I changed my oil every 500 miles or so. Actually a group of our friends rode every weekend, probably ranging from 250-500 miles on most weekends. We all changed our oil every weekend or every other weekend, depending how much we rode. That was with good oil too. Mobil 1 Racing 4T (used to be called MX4T). Now I use Shell Rotella T 15W40 in my GY6. My thought is that if it can hold up inside turbo diesels, it'll work for this thing... and it's like $3/qt. It gets changed about every 500 even though it leaks enough to change it's own oil. I got so used to paying $7/qt for 7 qts in my Mustang (plus a $10+ filter) that $3 oil changes seem like very cheap insurance in a hot running, air cooled, engine.
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