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Post by beerkeg on May 26, 2013 16:29:56 GMT -5
I got lots of great info on dealing with the wimpy performance on this bike here and actually have received from Scrappy the performance exhaust, the racing cdi, the mikuni jets to upsize the carb a bit. I pulled the lower covers off and find that the carb is virtually buried in there, even removing the airbox I do not see a way to get the carb off without dropping the engine and I am sorry to see that the kickstand attaches to the engine assembly so the bike would need to be suspended by its frame somehow. I have never seen such stupid engineering in my life and I've seen some weird stuff. Someone suggested removing the seat and the bucket, but the gas tank and the oil tank are right there on top of everything so that does not seem an option. My next move is to take it to the scooter shop here in town where they have the equipment to deal with such things and the know how to do it. I think I may have them do a bigger engine kit while they're at it. If anyone has come across such carb access problems on the jog miranelli QJ1E40qmb engines and figured it out please let me know how you got to the carb. I still have not located the cdi on this thing either. I may find that to get the performance I want I may well be smarter to sell this bike and get something else that's more accepting of upgrades. I like the bike but the top speed of 32 mph and taking a city block to reach that speed is unacceptable. I'd appreciate any suggestions, ideas, solutions or just sympathy!  |
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Post by skuttadawg on May 26, 2013 22:11:36 GMT -5
Some scooters have an access panel in the seat bucket and many the whole unit can be removed after unbolting . Remove the gas cap .
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Post by beerkeg on May 27, 2013 14:18:38 GMT -5
On mine the gas and oil fills are right under the seat at the top of that bucket, the battery is in a little well in the front. It has a disconnect plug. It appears that I can remove the bucket and then remove the gas tank if needed, it has to be disconnected from the carb to get the carb out anyway. The oil tank may be far enough back and to the right to allow access. I know the automatic choke has to come off and I'm sure there are other things. It seems they didn't engineer this to make the carb accessable for re-jetting or cleaning. Really strange that they felt the need to jam so much under there. I have a feeling the cdi may be under the floor panel, I see wires going forward and don't find it under the seat with everything else. Perhaps its much smaller than the racing one I got with the pipe. It appears that the seat will lift off with the bucket. This is certainly not a good set up for doing plug chops to find the right jet after changing the air filter and exhaust to a performance pipe. I will need the seat to ride far enough to get a good indication on the plug chop. What a weird mess! Thanks Skutta, it was your original suggestion about the bucket that had me looking again last night. Taking it to the scooter shop would quickly cost me enough to buy a new scoot. I did get a decent price on the bike so even with performance up grades it's still with in the positive side of the cost/benefit equation. I'm nearing 70 years of age and have seen some poor engineering (from a service standpoint) but this baby takes the cake so far.  |
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Post by 90gtvert on May 28, 2013 9:28:36 GMT -5
I may find that to get the performance I want I may well be smarter to sell this bike and get something else that's more accepting of upgrades. I like the bike but the top speed of 32 mph and taking a city block to reach that speed is unacceptable.( For performance, you have one of the best 49cc platforms. Access to parts just depends what frame and fairings the engine was stuck int, but it's a good little motor. I've never worked on that model, so not sure what to tell you there. Sometimes you can get to the bowl to change a main jet without removing panels from the underside. It's not fun, but it may work if the carb is that bad to get to otherwise. What you're seeing under the seat where you say the gas and oil tanks are, are probably just filler necks and caps I'm guessing. If that's the case you may be able to disconnect/remove the battery, remove the bolts holding the seat bucket in, and then take the caps off long enough to slide the seat bucket up and out. I'm 300lb and none of mine did only 32MPH stock. Yours is likely either out of tune (carb or CVT) or restricted. |
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Post by beerkeg on May 28, 2013 20:02:21 GMT -5
we know the variator is not restricted with any bushings, possibly it is the cdi that's restricted to a given max rpm or as you say the exhaust may be restricted. I won't know what jet is in there until I can get the carb opened. The gas tank is on top and covers the carb from the top, the oil tank may not be an issue. I plan to lift out the bucket and see if I can get to the carb that way. The new cdi I got is supposed to allow higher rpms and to advance the timing. I know that if the exhaust is restricted and if I replace it with a performance pipe I will have to up size the jet in the carb as well. I'm not sure I can fit a performance air filter or not, I need to get the airbox off and take a look. There are two screws at the bottom of the box that I've been unable to get out. They are recessed pretty deep and I cannot see in there to determine what driver is needed. All the others were phillips head. I can feel these and they almost feel as if they have stripped heads, but it's a new bike, right out of the factory crate. So unless they were screwed up during assembly I don't see why they should be damaged. I'll have to stand on my head to see in there. Possibly I can use a less restrictive foam in the same air box. I keep reading that this should be a great bike but so far it's stumped me.
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Post by jefe on May 30, 2013 21:45:50 GMT -5
I know this isn't super helpful, but maybe give you an idea of normal. I have an m50 and my top speed flat is around 43. Slight downhill and the needle is buried at 50 in no time. I'm up to 35 pretty quickly.
I've ridden a SYM and some other chinese scooter and the m50 is by far the quickest sans mods.
It would be great to figure out the problem before the bore. You will see a bump with 72, but you will always wonder what it could have been.
Good luck, wish I could offer a suggestion.
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Post by beerkeg on May 31, 2013 12:15:10 GMT -5
Hi Jefe,
I'd be satisfied with the performance you're getting. My problem may be soon resolved as I met a new friend who was admiring the bike in a parking lot while I was grocery shopping for a couple of items. He custom builds and restores cars and bikes and he is a big fan of the Bellini brand even though it's a Chinese built model. He's doing the upgrades for me since I am physically unable to do them myself. He will be installing a performance air filter, performance Pipe, re-jetting the carb, putting in a racing CDI, and installing a big bore kit to bring it up to about 72-73cc. Parts are from Scrappy Dog and again, many thanks to Mo for advice and information. We may decide to go a little lighter on the sliders and a bit stiffer on the torque spring. He confirms that access to the carb is from the top. I don't know what the total cost will be yet since while he's not charging me shop rates for labor and I will be assisting as much as I can, the parts alone are about $300 so still within reason for what I may end up with. I'm so glad to meet someone with the same bike and to know that the reviews etc were not exaggerated wildly I'm also glad that you're getting the performance I expected. Who knows, perhaps we'll find the reason mine is so wimpy. That one incident where the engine just shut off but restarted 15 minutes later troubles me and I suspect it to be electrical. How the heck does one find an intermittent failure? It seemed like I might have accidently flipped the off/run switch but she wouldn't even click until it cooled down a little. Old Peugeot mopeds did that with a condenser that would overheat due to it's location and maybe something like that happens here. Future unscheduled stops will likely give additional hints. Thanks for the reply and you're right, I already wonder what might have been.
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