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Post by 90GTVert on Aug 5, 2009 21:15:18 GMT -5
I removed the restrictor in the head pipe of my Leo Vince ZX 100cc exhaust before I ever installed it. It works great, but it's been bugging me knowing there is a second restrictor in there. I chopped my pipe in half and removed the sound deadening material. After getting a good look at it, I hate to call it a restrictor.    If i stick my ear near the exhaust I can tell it's a little louder, but my K&N still drowns out everything else. It's got a little more of the 2 stroke "ting" sound if you're listening close. Performance is the same. I made sure I gave it a couple of rides before I commented (100+ miles) to be sure. I really can't notice any difference, good or bad. I would suggest this mod to anyone that wants a louder exhaust, or absolutely has to make sure they are getting every last bit of power. Otherwise, you mgiht be disappointed. www.49ccscoot.com/remove.html |
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Post by 2strokd on Aug 6, 2009 7:18:52 GMT -5
You are a brave man! After all my pipe troubles and the 5 cut apart and weld backs on my old pipe im not messing with the Leo ;D. It did kinda bother me when i saw that in the diffuser but with the gains i got just by bolting the Leo Vince up versus my old POS pipe i figured i would leave well enough alone for once, on that anyway lol.
Thanks though! Im glad you checked into it and all is well. It definitely cant hurt, a bit lighter now also.
So how did the rest of the pipe look? From the outside they seem to be well built pipes. How bout the inside? Smooth? Free from eddies? I like the Leo pipes, as far as bang for buck im happy.
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Post by 90GTVert on Aug 6, 2009 7:32:21 GMT -5
Smooth, other than the entrace to the stinger. It's a pipe welded in the end to poke through a little rather than make a smooth transition. I couldnt rach it to grind it right and I didn't feel like cutting the pipe in more pieces.  I'm thinking I may be able to make a bigger difference in the pipe by modding the engine. These pipes are supposed to be designed for engines that make peak power around 9,600RPM. I'm thinking I should slap the timing light tach on here and see where I rev now. If it's still 9,100-9,200RPM as it was when I was first tuning I might order new gaskets, pull the cylinder, and raise the exhaust port slightly. I'm not sure if I wanna do it or not though. 40MPH is bad enough and I do enjoy the lower end power when I'm in town. |
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Post by 2strokd on Aug 6, 2009 7:43:55 GMT -5
Sounds about right, mine pulls good up to about 8,000(40 to 45mph) then it comes on harder to about 9,500, 9,600 50ish MPH, then it gets flat. 10,700 is the highest i have wound it up on a smooth flat with no wind and tucked. I really dont wind it out much anymore because i ride in town so much.
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Post by 90GTVert on Aug 6, 2009 21:39:38 GMT -5
Wow. I missed the mark on that one.... I stuck a timing light with a tach on the scoot tonight and took it out briefly. 7,800RPM @ 55MPH. I maxxed out at 7,900RPM tonight. I could probably go 8,100-8,200 on a good night I guess. I'm 800-900RPM shy of where I thought I was and about 1,400RPM shy of where the pipe is supposed to make peak power. It's in the 60's tonight and I haven't rode in that temp for a while now so the jetting could stand to be slightly richer, but it isn't doing that much. It's pretty cool that I can cruise at that speed at that RPM, but I'm thinking there is more power to be had from lighter rollers and raising the exhaust port just a hair. I think I'll try dropping from 6.5 to 6g rollers to see what that does for me. I know it should be capable of 9,000RPM because I've seen it go over that when I used to use the stock vari and 4g rollers.
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Post by 90GTVert on Aug 7, 2009 6:20:57 GMT -5
I stuck 5.5g rollers in this morning. Now it's about 8,000RPM @ 55MPH. 5.5g is about as light as I wanna go. I may even end up going to 6g. A new base and head gasket should be here Monday. I doubt I'll accomplish much, but maybe I can pick up a little more RPM. Certainly won't be making it to 9,500 with just this stuff. I think my cylinder could benefit from a good port job all around, but I don't really wanna mess with the transfers. I was looking at the port maps I made of my cylinder vs some 70cc port maps. My ports are very similar in size to 70cc mild/sport kits. I pretty much have stock 90cc ports, other than the exhaust outlet being opened up on the aftermarket cylinder.
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Post by 2strokd on Aug 7, 2009 9:36:05 GMT -5
Dang, thats good speed at thoughs rrr,s even though you do have a 90+cc thats still good. Mines gotta be geared different, i have havent hit 55mph below 9grand ever. I like the low end though.
To bad they dont make bigger cc kits with porting like some of the high end smaller kits. Have you found anything for the Minarelli ATV motors? I know you mentioned it before, about scoot-attack selling performance stuff for the bigger Minarelli clones that they sell on the little quads and stuff.
I wonder if they sell a wicked 90cc+ kit for one of thoughs thaat would work on your scooter?
Can you imagine with the way your scoot is geared now how fast you would be going at 10,000rpm? lol zzzzooooommmm!
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Post by 90GTVert on Aug 7, 2009 10:15:51 GMT -5
The 70cc Triton would turn 9,000+ RPM @ 50MPH. They appear to be the same gearing. I also did 9,000RPM @ 50MPH when I had 4g rollers in the stock variator. The problem was that it revved so fast that it actually took off slower. It would kinda free rev. I haven't had much luck finding anything racey for 90cc+ engines. There are water cooled kits, but I think they have the same or similar porting.
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Post by stepthrutuner on Aug 7, 2009 11:39:06 GMT -5
Didn't you put on a longer belt? I suggest you try a shorter belt if this is the case, before trying anything else. Make sense?
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Post by 90GTVert on Aug 7, 2009 12:51:59 GMT -5
The longer belt was backordered so I cancelled it. Looking at my variator recently, I don't think I'd even have a need for a belt 10mm longer. I have pretty much no unused space on my variator now.
I did get it up to 61.96MPH today. I think I had more in it , but stupid cars slowed me down. And to think there is legislation pending in my state because scooters are getting in front of cars and going slow! lol I had gone 61.69MPH before, but I've never been able to touch it since I lost my fairings. I'd been 60-61 plenty, but just never could top that mark. I may never do it again, who knows?
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Post by stepthrutuner on Aug 7, 2009 16:19:19 GMT -5
Speaking of tachometers, I tore the dash and floorboard and under pan off my scoot, took out the tach (It's a custom install in the plastic beside the speedometer). It has mostly not been working lately. Took the tach apart and checked the button battery. It was good so I cleaned and blew crap out of the bottom side of the tiny circuit board where the cpu is hidden. Apparently there must have been some conductive material floating around in there shorting or pulling a logic state so that no readout occurred. I then sealed it all up with clear Loctite Automotive Adhesive and put everything back together. It was a pretty big job and I secured the lower fairing behind the front wheel better in the process of putting it all back together. Probably took at least five hours but the tach seems to want to work 24/7 now.
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Post by 90GTVert on Aug 7, 2009 17:22:32 GMT -5
Nicely done. It woulda ended at "Stupid thing's busted" and throwing it away for me. lol
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Post by 2strokd on Aug 9, 2009 17:33:07 GMT -5
Maybe i should try that, my tach seems to work when it wants to. Sometimes it will shut all the way off until i hit a few good bumps or tap on it.
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Post by 90GTVert on Aug 9, 2009 18:43:58 GMT -5
Just another update on my tuning. I seem to hit upper 50's - 60MPH more consistently now since swapping lighter rollers. Once it gets to about 59MPH I start getting spark knock. By the time it hits 60+ it's bad. Judging from what I've seen with the tach (never had it on at quite that speed, but close) it's probably still only 8,200-8,300RPM though. Raising the exhaust port just a little should drop the effective compression enough to aid that situation though, I think.
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Post by stepthrutuner on Aug 9, 2009 21:58:53 GMT -5
You might try to space out that head a smidgen. Before I reduced the thickness of my base gasket (from 0.8 to 0.2mm, I think) on my 50 cc rebuild, top speed seemed to be 2-3 mph faster than after I reduced it. That was a pretty big change and the mid range really picked up but top end suffered. You might try .2 - .3 mm more head gasket thickness. That probably wouldn't knock much off the midrange. Come to think of it, that old base gasket may have been a full 1.0 mm.
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