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Post by aeroxbud on Aug 20, 2019 3:54:06 GMT -5
You should get everything you need to fit the exhaust, if it's supplied for your model scooter.
I have had quite a few Yasuni exhausts. The only problem I have had is one came with an L shaped spring. Instead of the straight one.
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Post by ryan_ott on Aug 22, 2019 20:23:47 GMT -5
I just saw this... it should come with everything you need. Be sure to mount the bracket on the correct side of the pipe.  |
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Aug 22, 2019 21:14:27 GMT -5
Ahh yes I see.. Everything did come in the package that I needed. After all, I have it mounted the same exact way you have it with the hangar bolts coming thru the back. The pipe just got here today and it got to dark to take any pictures but I did lay the C20 down next to both Leo Vince’s TT and ZX and I can tell you ALL the build quality on these pipes far exceeds any other I’ve seen. The welds are super nice and the thickness of the surrounding metal is what all pipes should be. I had a hard time finding a new C20. I checked Yasuni’s website and they do not have the C20 even listed anymore. PM Tuning out of England (the company with world record scooter speeds and that makes wacky looking 360 degree pipes) had one on sale for $120 quid euro* and it just so happened to be for a Minerelli horizontal. It came to $186 on my end after the currency conversion and import shipping. I’m glad I jumped on it when I did. I started the bike up and it sounds real good. I can already see after a few revs that it doesn’t like being down low for too long and seems like it would be a dog off the line unless I get a clutch and springs here soon. Leak down test tomorrow and than I should be able to button it up for a full on cruise.  |
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Post by aeroxbud on Aug 23, 2019 4:23:58 GMT -5
The welding is good on those pipes. If you don't paint them, they get a lovely colour when used.
Removed the restrictions yet?
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Aug 24, 2019 21:41:44 GMT -5
The welding is good on those pipes. If you don't paint them, they get a lovely colour when used. Removed the restrictions yet? Restrictions? Are you talking about the little peice that Yasuni puts in the stingers? I thought that was only on Yasuni Z, R, and ‘City’ 16, I didn’t know they were on the regular 16,20,21 and so on. Guess I’ll have to pull my pipe back off which is a shame since I wasted a gasket putting it on once before I did my leak down test. i pressurized my little Stihl chainsaw leak tester to 6psi and found one small leak at the base gasket at the bottom. I forgot to re-torque my stud bolts after I did a little heat cycling and first start. I guess this bore being aluminum it will be more movable with heat. After I re-torqued the head bolts I pumped it up again (6psi) and it held steady after 30 mins it only dropped about .1 or so. Holy shit this thing flys!! It absolutely RIPS!! Power comes on around I’m assuming 10,500 and wants to just keep going. I didn’t let it keep going much further just short little blasts here and there. I rode it up to the gas station and put Sunoco 93 in and mixed in some Maxima 927 at 32:1. The squish band is set at 6.6 I don’t hear any pinging. Temps never got past 260 even on my longest pull. Mid throttle I saw more of a temp spike than WOT so a pilot change is in order. Spark plug is NGK BR9HIX. Jetting commences tomorrow. This carb I’ve pretty much plugged and play. I haven’t even touched the mixture OR idle screw. Here are the specs of what I’ve just thrown and haven’t touched. Factory specs for Stage 6 R/T PWK 24mm Air screw 1 1/2 out Slow/Pilot jet 38 Main Jet 120 Power Jet 30 Jet Needle 4th Clip |
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Post by ryan_ott on Aug 24, 2019 21:55:44 GMT -5
For the mid throttle try adjusting needle height or change to a different diameter. Part throttle is what kills new builds. Use a CHT if you aren’t already.
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Aug 25, 2019 0:21:27 GMT -5
For the mid throttle try adjusting needle height or change to a different diameter. Part throttle is what kills new builds. Use a CHT if you aren’t already. I definitely have a 14cm CHT temp gauge mounted up by Trail Tech. I’ll take your advice and raise or drop the needle tomorrow while I’m jetting. I have 3 spark plugs on hand, a set of mains 125-148, a set of pilots 35-58 and a flathead screwdriver  . The weather has been gorgeous outside and I hope it’s like that tomorrow, I’d rather jet it in lower humidity and lower temperature that way it’ll be ready for the coming months. I’m pretty sure the plug I’ve used for heat cycling and these first couple rides is completely fouled from not being in the powerband enough. I know I’m jumping ahead here but ryan_ott what are your thoughts on the MVT Premium inner rotor Iggy model 06? Are/have you used this or something similar? I know you said the bugeye is ground to cut which is strange but very good to know, but I want to know what all is involved. Is it just that one splice? Or would I have to rig up a whole new loom/harness? I’m ready to order one, just don’t know what exactly I’m jumping into when it comes to wiring it up. |
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Post by 190mech on Aug 25, 2019 1:33:32 GMT -5
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Post by aeroxbud on Aug 25, 2019 4:08:12 GMT -5
Ignore me I was thinking of the city 16. It's my age! 😱
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Post by ryan_ott on Aug 25, 2019 9:39:10 GMT -5
Any CDI or ignition other then the OEM Zuma will be ground to stop. Only a standard automotive “86” relay is needed to make the engine stop with the key.
If you want to spend the money go for it but I don’t think it’s really needed. It’ll give you a better ignition curve and lighten some mass but what rpm are you turning.. The MVT is not bolt on you need to manually set the timing then check and recheck that it’s accurate. It doesn’t use the key way for location of the flywheel. The taper is what holds it in place. Brent at one point was using the Hoca ignition so he may know more about that one.
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Aug 25, 2019 16:03:51 GMT -5
Ok I’m going to hold off on that than. I was just worried the stock system wasn’t handling the really high rpm this combo is putting out. It felt/sounded like it was breaking up, but it was probably just my jetting. The single fuel petcock that’s for WR and YZs works good. This thing is turning out to be a pain in the ass to tune correctly. Either I have to raise the needle or I’m gonna have to order the SMALLER! size pack 100-122 because all the jets I’ve tried above the factory 120 have been way to rich. I more than likely have to put some money into the CVT really get a proper tune.. More waiting I guess. I think I’m gonna go with the Stage 6 Torque control clutch in 105mm. I’m running 4.5 g rollers. Instead of the the Iggy I was thinking of getting an a full Malossi overrange Kit since I’ve removed the starter clutch and all its components, I had to shim it a lot.   |
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Post by hellish100 on Aug 25, 2019 22:43:59 GMT -5
I wish I had some meaningful advice. I just think a 24mm carb is a bit overkill. I think a 21 would be easier to dial in.
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Aug 26, 2019 11:41:03 GMT -5
I wish I had some meaningful advice. I just think a 24mm carb is a bit overkill. I think a 21 would be easier to dial in. You know what? Your right. If I’m having to drop down main sizes from the factory size it came with, it’s a sure sign that this size is a bit much for my crankcase volume. I did do some porting of the case but very mild, that with a new HPC crank its just a little much. Not only that, it’s loud since I’m running a foam filter and my gas mileage has gone to hell. I’m gonna try and work with it though and get it correct. One things for sure, it’s definitely keeping the cylinder cool. I haven’t seen temps past 260 even going up hills and on WOT let offs it cools itself down. This is with the smallest jet I have 120. The 50 size pilot is perfect though. |
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Post by hellish100 on Aug 26, 2019 19:51:22 GMT -5
Lots of fuel will keep it cool for sure. Do you have an air box? I’d throw that back on. The best running 2ts that’s ive ever ridden ( street bike, mx, scooter; snow mobile) have all had their airboxes. |
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Aug 26, 2019 21:06:03 GMT -5
Lots of fuel will keep it cool for sure. Do you have an air box? I’d throw that back on. The best running 2ts that’s ive ever ridden ( street bike, mx, scooter; snow mobile) have all had their airboxes. I’m going to go ahead and try out my airbox with an adapter. I’m glad I didn’t toss it! Appreciate the advice with your experience. I checked out some of your builds and YouTube channel. Man those are some awesome builds. I see that your a Yota nut too. I’ve been wanting to do a BEAMS swap in my Toyota SR5 (pick-up/Hilux) for a while now. |
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. The weather has been gorgeous outside and I hope it’s like that tomorrow, I’d rather jet it in lower humidity and lower temperature that way it’ll be ready for the coming months. I’m pretty sure the plug I’ve used for heat cycling and these first couple rides is completely fouled from not being in the powerband enough.
