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Post by 90GTVert on Jun 17, 2010 23:52:00 GMT -5
Definitely figure out what kind of travel your belt is getting. It would be very helpful to know how high it is revving. Not sure if you can rent timing lights that would have tachs or not? Probably not, but it might be worth asking.
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Post by duosport on Jun 18, 2010 11:47:33 GMT -5
I am not sure how the electronic gages work yet on my scooter. Perhaps there is a tach mode on it. I will check into it.
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Post by duosport on Jun 18, 2010 17:20:37 GMT -5
I have been reading bits and pieces on the internet about how Malaguti F15s are restricted at the exhaust. Now I have found the narrow point at the base of the muffler unit and drilled it out a bit, I did also hear several other different sort of descriptions of the restriction. One called it a "vee" shaped element inside the pipe. Another said there was a "welded" restrictor near the cylinder. Yet another refered to removing the "second pipe" thing and having it welded. Well I do have a metal cylinder on a short tube welded to the first elbow of the exhaust pipe. I had gathered this was catalytic converter as there is a sticker on the body of the scooter refering to it being catylized. I also had heard reference here and elsewhere to "booster bottles" What is that?
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Post by 90GTVert on Jun 18, 2010 19:41:43 GMT -5
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Post by duosport on Jun 18, 2010 20:05:18 GMT -5
Yes booster bottle. Thanks for the info. so what I have attached to my exhaust is obviously not some sort of booster bottle. So what is it? Is it a restrictor? Is it a catalytic converter?
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Post by duosport on Jun 18, 2010 21:14:59 GMT -5
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Post by duosport on Jun 19, 2010 9:45:00 GMT -5
Definitely figure out what kind of travel your belt is getting. It would be very helpful to know how high it is revving. Not sure if you can rent timing lights that would have tachs or not? Probably not, but it might be worth asking. I did some testing this morning on the belt travel. It is getting to within 1/4" of the end of the vari. So there is a little more room but not a ton. As far as a tach I explored the electronic gages and there is a tack but it is a non marked tach. Not only is it not market but "graph" area is "L" shaped. The graphic lines go up the small part of the "L" and I suppose if it were high reving it would venture into the long part of the "L" area. My high rev takes up about 1/5th of the total area. It is meaningless I am sure. It implies the revs are very low. |
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Post by duosport on Jun 19, 2010 9:47:55 GMT -5
Oh and by the way I did a test of removing the muffler part (which I had drilled out) and rode it. There was no increase to acceleration or top end. So the drilling I did has by passed that restriction completely. But I wonder about this extra pipe welded onto my exhaust with the metal bottle. Is that a catalytic converter? If what I have read is true about them is they render a little bit of lost power but not a ton.
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Post by 90GTVert on Jun 19, 2010 10:50:30 GMT -5
The part you are talking about is some sort of emissions equipment. The only 2T catalytic converter I have dealt with was inside the muffler. It's usually something like a honeycomb shaped grouping that exhaust gases pass through. 1/4" of travel on the variator could easily be 5MPH. Since you say the revs seem low, the lack of travel could simply be a result of the low revs. Check this thread out if you haven't already. According to them you should be doing 50MPH stock if it's not restricted. forum.scooterforum.net/forum/f74/malaguti-firefox-f15-help-182520/I've noticed lots of people adding larger main jets to these scoots as part of derestriction while searching. |
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Post by duosport on Jun 19, 2010 11:50:53 GMT -5
One guy there said this:
"If it is in the original state, you will need 6 to 6,8grams rollers. Original (white) clutch-spring. Original smallsprings (dont know the name). Take out the ring that is in the variomatic system if it is still there. Derestrict the original exhaust (in the front where it connects to the cylinder, and also in the silencer if it is a new type exhaust). You will proably have to go up in mainjet a little. This should get your topspeed at +- 80km/h (about 50mph I think) with a good acceleration"
The restriction at the muffler I had and removed. The one at the cylinder on the exhaust I did not see. Perhaps it was removed buy the original owner of the scoot. There is a metal ring but that is as on my other scoots. It does not restrict airflow, rather it is the compression joint. He is stating if you make these mods you should see 50 mph. this is without an upjet. Something else is holding me back.
This morning I took out the sleeve in the variator and ground one end down equal to the thickness of the washer. I reinstalled it and all put it back together and did not experience any increase to the top end. Infact I think I took away start up acceleration.
Something is still holding me back.
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Post by duosport on Jun 19, 2010 12:58:08 GMT -5
My rpms are low. It sounds low and the dummy tach only travel north a little bit when full out. So how do I increase my rpms?
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Post by 90GTVert on Jun 19, 2010 21:42:17 GMT -5
You lost takeoff by grinding the drive boss because now you are starting out in a higher "gear" since the belt can't get as low in the variator.
The main jet being off could affect RPM (I know one guy didn't mention a jet, but others have... ever heard the phrase "results may vary"). It could be something in the transmission holding you back. Lighter rollers or a stiffer contra spring should give you more revs. You've had the engine apart. Did anything look a little off to you in the intake, reeds, engine, etc... that you would even mildly suspect of causing a lack of performance? Are all the gaskets back as they were (more/less head/base gaskets can alter compression, squish, and port timing)? I think these might have been mentioned over the 14 pages, but if not... tire pressure... brakes dragging.
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Post by duosport on Jun 20, 2010 9:02:19 GMT -5
Nothing looked off to me at all when I had things apart. The reeds are the original steel ones. They look great and are functioning well. Gaskets are fine on the intake. All the gaskets are perfect on the top end.
As far as grinding down the drive boss I only did it the width of the washer so I can put the washer back and that should make it as it was before.
In the umpteenth time I reassembled the cvt yesterday I looked closely at the air chamber for the filter. There is a restriction in the air passage to the filter chamber. The plastic passage is molded with a narrow spot in it. It is not a plastic tab on the inside but rather the whole thing is shaped narrower.
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Post by duosport on Jun 20, 2010 9:22:14 GMT -5
just as a side note: I had accidentally left the rubber elbow that connects the carb to the air filter chamber, partially off. This let extra air into the carb. I knew it was off to check it after I ride the scooter because it bogged on acceleration. My guess is the amount of air coming in equals the main jet size. Really is this scooter not suppose to run faster than 35 mph stock?
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Post by duosport on Jun 20, 2010 9:38:41 GMT -5
If I upjet then I am guessing I will need to increase air flow. I really am not so comfortable mutilating the airbox. Maybe it would be possible to simply bypass the original airbox and turn the rubber elbow and locate a new open type filter. Not sure if there is the room for that.
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