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Post by lordverminaard on Aug 17, 2017 10:15:21 GMT -5
I'll let the pic speak for itself:  I didn't have enough time last night to get it completely installed. Some notes though, this variator is about 4mm in diameter bigger than the stock one. The Yellow torque spring is almost twice as long as the stock one. The stock one was so fatigued that once I loosened the nut on the clutch bell, I could hold it closed with one hand while I removed the nut with the other. This thing is going to fly. I can't wait. Hopefully I can take a ride tonight after I button it up, as long as the rain holds out. Brendan |
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Post by lordverminaard on Aug 18, 2017 9:44:27 GMT -5
Finished it up last night but not without some drama. Not 5 minutes in to working, I was poking a clutch spring with a small sharp screwdriver, not even really intending to try and get it off but to just check how tight it was, and it slipped and I ran it right through my index finger, at the meaty part between the knuckle and first joint. Ouch. I think I got it cleaned up and it is sore but doing well so I think it will be fine. Not really how I wanted to start the night though, haha. No other issues installing the variator other than when it came time to install the belt, trying to spread the pulley on the clutch side was very hard, especially with a gimpy finger. The belt is also VERY tight, I think I might need a longer one. Here was the belt alignment when done:  I have 6 gram weights in it right now. Took it for a spin, and immediately noticed the acceleration to be MUCH stronger. Once it warmed up, I went to a big parking lot and gave it a few rips, and it will pull to 30 mph pretty fast, but stop accelerating at that point and only got about 33 mph out of it in the space I had. Can't really tell if the variator is closing all the way or not, I marked the variator but didn't have time to pull the cover and see where it was last night. I also sort of feel like it isn't in the powerband all the way yet. Time to refresh my CVT tuning knowledge I guess, hahah. I am sure having a slightly longer belt would help too. Just when I thought I was getting to the end of this, looks like my tuning is just beginning.  Brendan |
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Post by lordverminaard on Aug 20, 2017 8:58:43 GMT -5
7gram weights, 35 mph. Belt is only making it about halfway up the variator. I'm thinking if the belt is really tight, that might be preventing it from closing all the way?
I think it has a 777 belt in it right now, would a 787 be correct?
Thanks,
Brendan
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Post by 190mech on Aug 20, 2017 10:41:50 GMT -5
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Post by lordverminaard on Aug 21, 2017 8:05:21 GMT -5
Yep, torque driver is nice and smooth.
It has a 777-16.5-26 Bando in it right now. WTF? The only thing I can think of is that it is the "speed limiting" device since a thinner belt won't ride as high, or someone just replaced it with the wrong belt? Dunno but I am going to fix that before I start doing anything else crazy with roller weights and such.
Brendan
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Post by AtariGuy on Aug 21, 2017 8:46:14 GMT -5
Yep, torque driver is nice and smooth. It has a 777-16.5-26 Bando in it right now. WTF? That sounds like an odd size belt to my knowledge. The 777mm length could also be a limiting factor, getting into a longer 788 belt may allow more use of the variator to get that top speed you're missing. |
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Post by vlatx on Aug 21, 2017 14:52:32 GMT -5
you need a 788 belt and lighter rollers around 4.5gr
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Post by lordverminaard on Aug 28, 2017 11:52:26 GMT -5
Belt came late last week, so I got some more work done, and I have also learned a valuable lesson: Don't attempt CVT tune until your engine tune is good. A lot of the initial issues I have been having I thought was related to the CVT and in fact was bad engine tune.
I was going through the different variator weights, never getting more than about 36 mph out of it, and the heavier I went the worse acceleration and normal riding got. I never used the lightest rollers so I went back to the 5g just for fun, and besides acceleration and speed I noticed that it started to break up a bit in high rpms. I thought, well, it's either CDI rpm limit or too rich. I decided to swap the main jet since that was a quicker job. The only un-altered main jet I had was a 95, so I put that in. Fired it up and noticed an immediate difference, gave it a couple hard revs and it zinged to a higher RPM than it ever had before. Took it for a ride with the 5g weights and holy moly, it's a different beast. I hit 38 mph on a test ride this time. I didn't have much time left so I mixed 5 and 6g weights and took another spin, didn't notice any acceleration losses and hit 40 mph. That's all I had time for but I guess I need to try 6 and maybe 7g to see what I get. The pilot jet probably needs to come down a little too as it is a little sluggish in the initial crack of the throttle but mid and highs are very very good so I will leave the main where it's at.
Right now here is where it sits:
47 pilot
95 main
airbox with snorkel removed, 1/2" holes x4 in the leading edge of airbox, holes on the back closed up. (see note)
Koso variator, with stock ramp plate, 5 and 6g weights
Stock CDI
788 Bando
Yellow contra spring
yellow clutch springs
ebay pipe
I'd like to replace that pipe with a "real" one but unless a really cheap one falls into my lap, this one will have to do.
*Note: Thoughts on the airbox. I think why I was having so much trouble tuning this thing initially was the holes on the back of the airbox. By themselves, I don't think it would cause that much of an issue, but looking at it closer, the holes on the back of the airbox line directly up with the outlet vent on the cylinder shroud, so that cooling air from the fan is blowing directly in the airbox. I don't think it is a huge volume of air but it's probably enough to throw off air metering enough to make tuning not so easy. Having the holes on the leading edge of the airbox seems to make it behave a lot better.
My goal now with this thing is to be able to hit 45 MPH without much issue. Hopefully I can make it happen.
Brendan
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Post by vlatx on Aug 30, 2017 16:26:40 GMT -5
With the Sport Pro MKII 45 MPH is a pice of cake even with stock pipe.
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Post by robwelding on Sept 1, 2017 20:32:15 GMT -5
Are you intrested in testing one of my custom exhausts? Im currently building 10 pieces from stainless steel, the specs are a little better then a C16, the exhaust is called "Son Of Michael R16". I want to loan you one of my exhaust, if you can test it and give a revieuw or compare it to other exhausts that would be great, And if you really like it maybe you wanna keep it. Here's the project page, I think I can make one that fits your engine using the parts I had lazerd. here is the topic on the whole desing and progress 49ccscoot.proboards.com/thread/18355/exhaust-build-peugeot-ludix-stage6. I desinged the exhaust especially for the MK2 sports Pro cylinder and looking for people who wanna test it. Send me A PM if your intrested  Grtz ROb |
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Post by lordverminaard on Sept 3, 2017 12:52:37 GMT -5
With the Sport Pro MKII 45 MPH is a pice of cake even with stock pipe. Well I must have something wrong still because it won't hit 40 unless I am going downhill right now. Going to do one more roller weight swap to see if I can improve it a little but something must not be right. |
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Post by lordverminaard on Sept 3, 2017 12:53:15 GMT -5
Are you intrested in testing one of my custom exhausts? Im currently building 10 pieces from stainless steel, the specs are a little better then a C16, the exhaust is called "Son Of Michael R16". I want to loan you one of my exhaust, if you can test it and give a revieuw or compare it to other exhausts that would be great, And if you really like it maybe you wanna keep it. Here's the project page, I think I can make one that fits your engine using the parts I had lazerd. here is the topic on the whole desing and progress 49ccscoot.proboards.com/thread/18355/exhaust-build-peugeot-ludix-stage6. I desinged the exhaust especially for the MK2 sports Pro cylinder and looking for people who wanna test it. Send me A PM if your intrested Grtz ROb Dude, that's awesome. I'll send you a PM shortly. Thanks, |
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Post by lordverminaard on Sept 5, 2017 18:30:03 GMT -5
Learned something else today- many of my issues are due to me being a big dummy. I was continually blaming the tune, (and honestly it probably still isn't perfect yet) but for some reason today I decided to go lower than 5g weights, member vlatx mentioned 4.5g rollers, (27g total) so I figured why not. I put 3 9g weights in, and went for a spin, and it felt faster than I had gone before. Hit 40 on a short section of road and felt like it wanted more, so I pulled those and put in 3 of the next heaviest weights I had, 7g - 21g total. Holy balls, it rips now. I noticed that my tune is more off now that it is running in higher RPM's, at part throttle it will cut out a little at launch, feels too rich to me which makes sense with my pilot jet being a little too large. I went for a longer ride around town and other than a few instances of it cutting out part-throttle and launches being a little slow, it did fine, and there was a long straight section of road with a slight downhill that I was able to hit 50 mph indicated on my phone GPS. So powerband is everything I guess. I feel like this pipe is really tailored to a stock cylinder as there is a nice surge of torque in the midrange and even though it seems willing to pull at high RPM I feel like it is being held back some. What sucks is that even though I am lacking experience with 2-stroke scooters, if I had even a cheap ass tachometer, I would know that it wasn't running at the RPM's the cylinder was made for and that I needed to make adjustments to compensate. Oh well, lesson learned. At least now I am comfortable enough riding it in town without feeling like I am going to get run over. I need to order some sliders for it, should I do 4g or 4.5? I am thinking 4g but a set of sliders is expensive enough that I don't want to buy two sets just for testing purposes. Thanks, Brendan |
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Post by 90GTVert on Sept 6, 2017 6:04:40 GMT -5
If you go a little lighter, you can stuff sliders with foil and add a gram.
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Post by lordverminaard on Sept 15, 2017 10:48:32 GMT -5
Put a 45 pilot in, (also made from a slow air jet out of a Keihin carb, haha) and that fixed the cutting out issue at part throttle.
Went down to 3 6g weights and it feels better still. This begs the question, should I put a "red" torque spring in? Seems as though I am at the lowest overall roller weight limit so it might be time to stiffen the torque spring- thoughts?
Also noticed my clutch engagement is pretty weak- has yellow springs in it right now, and I also drilled a hole in the web of each shoe to lighten them up more. It still seems to start engaging at too low of an rpm- low enough in the rpm that it bogs quite a bit on launch, then when the rpms climb, it slips quite a bit until it fully engages under full throttle. Does this mean that I have to bite the bullet and get an upgraded clutch? If so, any recommendations for a nice cheap one that works well?
Maybe by the time riding season is over I will have this thing sorted out, haha.
Brendan
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