Timmer
Scoot Enthusiast
Posts: 128
Location: Mechelen, Belgium
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Post by Timmer on Apr 14, 2024 12:28:34 GMT -5
Well, it sucks you had to take it all aparts again (or maybe not  ), but if that’s what the issue is, glad it got sorted, and it’s a rather cheap fix too. |
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Post by aeroxbud on Apr 14, 2024 12:54:46 GMT -5
At least you got to the bottom of the problem before it became expensive.
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Post by billwill on Apr 14, 2024 18:40:23 GMT -5
Well, it sucks you had to take it all aparts again (or maybe not ), but if that’s what the issue is, glad it got sorted, and it’s a rather cheap fix too. Yep, thankfully I had another gasket set ready to go too. I had ordered it a month or so ago when I thought the base gasket had a leak and it happened to be the cylinder casting. At least you got to the bottom of the problem before it became expensive. Indeed! Could have been much worse. |
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Post by billwill on Apr 15, 2024 14:56:18 GMT -5
Set the squish higher yesterday to about .66mm-.69mm.     Andddd, mild pinging is still there, but it did seem to run better. Idle sure seems smoother. But, RIP. Going to try the "top off car then fill gas can with premium gas" method and go from there. Still have yet to test a colder plug but after reading online, I'm not hopeful for that to help. Gonna go fill up at a busy Shell station and go from there. |
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Timmer
Scoot Enthusiast
Posts: 128
Location: Mechelen, Belgium
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Post by Timmer on Apr 15, 2024 15:22:23 GMT -5
About the premium gas (i don’t know the US nominations, but you’ll understand);
In Europe (belgium anyways), we have Euro95 (E10) and Euro98 (E5) super unleaded fuel.
Euro 95 has a lower ‘knock resistance’than 98, as 98 has a higher octane levels }and less ethanol and some more magic additives). My golf mk1 could NOT run on 95 as it sould stutter and knock, but ran fine on 98.
Now i know the US has like 91 regular, something premium and something else, and diesel. I can’t tell you which one has what octane level, but i could be worth a shot trying higher octane.
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Post by billwill on Apr 15, 2024 15:53:53 GMT -5
About the premium gas (i don’t know the US nominations, but you’ll understand); In Europe (belgium anyways), we have Euro95 (E10) and Euro98 (E5) super unleaded fuel. Euro 95 has a lower ‘knock resistance’than 98, as 98 has a higher octane levels }and less ethanol and some more magic additives). My golf mk1 could NOT run on 95 as it sould stutter and knock, but ran fine on 98. Now i know the US has like 91 regular, something premium and something else, and diesel. I can’t tell you which one has what octane level, but i could be worth a shot trying higher octane. Yep, sadly there are limited pump gas options in town or even the surrounding areas. What you'll find here in the U.S. in most cities and states (and we have it pretty good on the East coast) is 87, 89, 91 and 93. Some stations have higher, and there are even some Sunoco stations on the other side of town that sell 5 gallon pails of race fuel. Usually these have an octane rating of about 110 or so, so I would mix it with pump 93 at 50/50. I'm going to try the 93 and report back. I think I read somewhere online that the MXS race kit calls for 98 octane so I may end up having to mix 93 with race fuel to achieve no knock at this squish. I can't imagine this kit performing well with squish set to .8mm, .9mm or higher. But, maybe it would? Going to try the better fuel method first and go from there. I really don't want to have to continually mix race fuel with pump gas but it is what it is. I got into this build knowing it would be no daily driver LOL. Gotta pay to play. |
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Post by bigmatthew86 on Apr 15, 2024 19:57:35 GMT -5
Throw in the colder plug too. Very cheap & easy
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Post by billwill on Apr 16, 2024 17:36:52 GMT -5
Started emailing back-and-forth with VP fuels and they got me in touch with a local speed shop that had some c12. Was chatting with the guys there and they mainly work on dragsters and big V8s. Was pretty cool to chat with them for a bit about this build and see that they were genuinely interested. One of the guys there are races motocross, and works on his bikes and admitted that he didn’t have too much experience with two strokes, but said that c12 Is the go for guys that do run in the two-stroke class and need it. The place is actually only about a quarter mile off The way I take to work. They said they wanted me to stop by and see the build so once I get it running right going to swing by. Not much time lately to get out and Test should be up and running here soon hopefully with some good results.  |
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Post by billwill on Apr 29, 2024 11:44:35 GMT -5
After a lot of testing and trial and error over the past couple of weeks, I am still facing an issue with top speed for this build. Currently on flat ground, she tops out at 64mph at around 12,300-12,500 rpm.
I have checked belt travel by marking the variator and there is full belt travel. I have also checked in the rear and added a custom spacer between the clutch.
I’ve tried a malossi red torque spring with malossi belt and 4.6g rollers and had similar performance. I switched to this setup just to see if a softer contra would allow for more belt travel in the rear pulley. It is similar performance.
I was curious about gearing so even did a few downhill runs to test that out. Was able to get up to 70mph and it sounds and felt like it had more in it although there does sound to be a flat spot in the upper rev range where its either running out of fuel or something.
I even tried switching back to the 24mm PWK from the 30mm in the videos below and its near identical performance and identical speeds.
I think I am coming to the realization that despite the ST pipe being a work of art, its just not living up to the hype and has a super narrow powerband that turns on around 9,000-9,500 RPM and levels off around 12,500 RPM.
Flat ground with the ST pipe
Downhill run with the ST Pipe
Downhill run with the Yasuni C16
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Post by bigmatthew86 on Apr 29, 2024 13:17:12 GMT -5
That’s pretty fast. What gears are you running again?
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Post by billwill on Apr 29, 2024 14:50:45 GMT -5
That’s pretty fast. What gears are you running again? 15/50... so 11:1 final drive. 70mph on flat should be easy on this with the current setup. Like, guys have hit faster speeds with less cylinder and pipe. I even weighed my rear wheel today and compared it to a stock prebug wheel to see the difference. LOL! The rear aerox fatty I'm running sits at 17.3lbs (probably more like 19lbs if you add rear disc and hub) The stock wheel and tire weighed in at 14.7lbs I'm not sure that this amount of rolling mass would matter with top speed that much, if anything it may HELP like having a heavier flywheel.    |
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TheScooterJesus
Scoot Enthusiast
Popping up the 2 stroke
Posts: 124
Location: Chicago, Illinois
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Post by TheScooterJesus on Apr 29, 2024 14:55:55 GMT -5
4.6g seems light to me for trying to achieve more than 65mph. I would recommend going up to 5 and slowly increase to see when it eventually drops off and you can back off on the weight a bit.
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Post by billwill on Apr 29, 2024 14:58:03 GMT -5
4.6g seems light to me for trying to achieve more than 65mph. I would recommend going up to 5 and slowly increase to see when it eventually drops off and you can back off on the weight a bit. right on, i agree. I was running 4.6 with a malossi red and it felt solid but perhaps i can go up. will try it! most of these guys who are big into prebugs don't go any lighter than 5g, so its worth a try. |
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Post by bigmatthew86 on Apr 29, 2024 15:11:05 GMT -5
If you don’t absolutely need a red contra I’d run a yellow.
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Post by billwill on Apr 29, 2024 15:48:51 GMT -5
If you don’t absolutely need a red contra I’d run a yellow. I'm with you. I have an extra one too. That's why I had most recently switched to a stage6 orange/soft one, thinking it'd be like the yellow but better. But yeah, the red is so tight and just creates so much heat in the transmission. |
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), but if that’s what the issue is, glad it got sorted, and it’s a rather cheap fix too.
