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Post by Kenho21 on Jun 20, 2020 21:01:27 GMT -5
Welp... I had a little time to play around with it today. First, I swapped CDI's for the spare I bought off of a dude's parted out Zuma a while back. That wasn't it. Switched on both fuel sources during my ride to. That wasn't it either. I decided to give my ignition system a look-see, so I popped my shrouds off and noticed I had a sizable gap between my coil and pickup. That could be it maybe???   My idea was to throw in the 3 degree woodruff key that advances or retards timing and see if that made the difference. As soon as I got the stator off I saw how rough of shape it was in. I did sand it and coat it with clear nail polish when I was rebuilding it, but it looks a little rough. The nail polish didn't stop the rust apparently. The ignition system is just about the only major part I didn't replace to brand new OEM or high-end racing junk. Me thinks I should have. Anyway... in the process of getting the flywheel off, this happened.  I'm not sure if it was my fault or if it just fell apart from being lightly touched because it was in that bad of shape. Either way, I'm dead in the water until my parts order arrives from Partzilla, which will hopefully be this week. Luckily, I kinda figured it was time to replace my iggy and ordered one last Thursday, but it doesn't say it's shipped yet. |
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Post by Kenho21 on Jun 20, 2020 21:57:50 GMT -5
Debating breaking out the soldering iron, but she's so beat up I kinda figure I might as well wait for the new gear.
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Post by Zino on Jun 20, 2020 22:38:53 GMT -5
I'm thinking you found your tired part right there .
Ive had my zuma apart replacing seals recently and you could have fatigued that wire when you were moving the stator around on your crank install
I once pulled a coil wire on one of the beamers apart just by touching it lightly moisture and fatigue over a few thousand miles did it in.
It ran so much better with a new coil.
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Post by matlock on Jun 20, 2020 23:24:48 GMT -5
i think that wire was broken all the time and just shorting out at high rpm i think u solved the puzzle
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Post by matlock on Jun 21, 2020 11:43:04 GMT -5
Kenho21 you are very lucky someone has Not reported you to brent yet for your XXX rated Photo posts you really need to think before you post such Inappropriate photos without a warning of Content or rating of XXX ,,god forbid my son ever came on this website kenho21 that money shot of the open case with the Super Sexy Red Malossi Torque Driver With its Holes showing is waaaaaaaaay too sexy for this page you can really ruin ones day with photos like this i know you messed up my thought process for 3 days straight.... please take others into consideration when posting such Revealing photos thank's Matt Wow Ken, I'm impressed. Looks like you've got the zuma running great! You're motivating me to get back to work on mine... What are your thoughts on the LFR after using it for a while? Thank you! I really like the LFR. To be honest though, the only way I’ve ever ridden my Zuma is with the bike as it is now, aside from swapping exhausts. I really have no baseline comparison of how it performed before and after installation of the LFR. I have a lot of higher end parts on this build and it’s damn near impossible for me to say which parts are responsible for specific performance characteristics. [mention]ryanott [/mention] May be able to give more of a before and after comparison. I can say that it’s been pretty easy to get the CVT in tune though. Acceleration is pretty linear and I haven’t really struggled to get the revs where I want them so far. The only negative comment I have is that I wish the belt sat a little higher in the rear pulley. I’m pretty happy with its performance thus far though, so that’s something I may decide to experiment with later after I have other kinks ironed out on the bike.  |
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Post by Kenho21 on Jun 25, 2020 17:37:46 GMT -5
Not sure exactly what the issue was, but a new ignition solved it. I have a feeling it was just poor conductivity because of corrosion or distance between the magnet and pickup. Revs up nicely now.
Time to get back to dialing in this C16 and putting some miles on this thing!
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Post by Zino on Jun 25, 2020 18:11:49 GMT -5
Good to here you got it fixed .
Stock ignition you should be good to 11k RPMs
Once you get that pipe dialed in you might be touching 70 mph.
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Post by 190mech on Jun 25, 2020 18:20:35 GMT -5
Corrosion is one of the biggest Gremlins in machines!Looking at what you were running I bet at least 2 Gremlins were living in there!!  |
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Post by Zino on Jun 28, 2020 21:57:24 GMT -5
What were you running for weights in your variator for Yasuni R and now the C16 ?
What Rpms are you peaking at and what Rpms does it hit when you Hit the throttle wide Open?
Did You have to go stiffer on clutch springs ?
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Post by Kenho21 on Jun 29, 2020 7:03:59 GMT -5
TBH, I have not dialed my bike in to the new pipe completely yet. Between work, school, fixing, and riding bikes, I haven't had any time to. It's good enough for cruising around and I can get up to about 60mph, but it's still a little slow on mid throttle pickup and the top speed is currently slower than I had on the R. I have a new slide and needle on the way from Treatland.tv to address the carb I hope. Plug says it's still a little rich and it feels like it is.
That being said, I'm relatively happy with my weights and did have the R dialed in nicely, so I can give you a little feedback.
R Setup:
~6,500rpm clutch springs
White contra
5.5gr
On the R, I was running 5.5gr weights and was ~9,900rpm off the line and peaked at about 10,300rpm top-end, if I remember correctly. I think I notated this earlier in my thread.
On the C16 so far, I'm running 5.0gr rollers and am at about 10,800rpm off the line and ~11,400rpm top-end. I'm relatively happy with the rpm, but may go a little heavier. Maybe 5.1 or 5.2ish. I also switched from the white a yellow contra because I was getting pretty bad belt slip. My top speed is only ~60mph.
So the current C16 setup :
5.0 gr rollers
~6,500rpm clutch springs
Yellow contra
Hope this helps
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Post by Zino on Jun 29, 2020 16:37:42 GMT -5
The yasuni r for me 5 to 5.5 is good with the yellow contra .
I am in that same range about 6 k for clutch springs .
I have noticed in the past The yellow contra makes weights act like they are a half gram less .
So you are basically running equivalent of over a gram less .
11,400 rpms that is impressive that C-16 really likes to Spin .
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Post by Kenho21 on Jul 18, 2020 7:09:50 GMT -5
So, I've been having a hell of a time with this C16. Between rides and obligations, I haven't spent as much time as I would like trying to tune this thing, but I've definitely tried a lot of stuff.
I've tried all different kinds of jetting, new needle, and a new slide. Definitely not the issue. I've also tried yellow and white contras and 4.7-5.3 gram rollers and also not had good results. Going to mess with rollers/contra again tonight or tomorrow, but strongly considering just getting another Yasuni R and ditching the C16. Thought I'd post here first as a hail mary though.
The symptoms are that it is slower than the R for top speed. It revs for sure, but the top speed is the same or a little slower than the R, about 62mph. I am getting full belt travel and topping out in the ~11k rpm neighborhood. Also, there is kind of a dead spot while trying to cruise at 45mph or less. It doesn't like part throttle and is more of the "on/off" type of feeling.
Anyone have any ideas?
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Post by oldgeek on Jul 18, 2020 8:06:15 GMT -5
The overall tune is a result of all sub systems converging together. In my experience any change in one sub system may require a change in the others. Example, something as simple as changing the contra spring may require a carb retune and a weight adjustment in the variator.
The dead spot is definitely the carb. I have no hair left due to tuning my carbs LoL! I wish I knew about the CP carbs, but looking closely at the PHBG chart I sent you should help guide you to the trouble spot. Your carb trouble may actually span across a couple components in the chart.
I cant remember, did you check your port durations? If so what were they? Your C16 may not go well with the cylinder if the durations are too low.
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Post by Kenho21 on Jul 18, 2020 8:46:58 GMT -5
The overall tune is a result of all sub systems converging together. In my experience any change in one sub system may require a change in the others. Example, something as simple as changing the contra spring may require a carb retune and a weight adjustment in the variator. The dead spot is definitely the carb. I have no hair left due to tuning my carbs LoL! I wish I knew about the CP carbs, but looking closely at the PHBG chart I sent you should help guide you to the trouble spot. Your carb trouble may actually span across a couple components in the chart. I cant remember, did you check your port durations? If so what were they? Your C16 may not go well with the cylinder if the durations are too low. Yeah, it feels like the carb is my issue for the dead spot in the mid-throttle circuit. I’m not super concerned about that though. I may or may not be able to work that out. I think the issue is I’m just a bit rich and having a hard time getting the exact amount of air I need, but that’s the lesser of evils. Rather be rich than lean. My main concern is the top speed. That’s the main reason I got the pipe. At this point, I’m starting to feel like the cylinder and pipe may not play well together. I talked to another guy who had the same exact issue, but on the Malossi cast bore, I believe. He thought he may have the wrong crank for the setup, but mine should not be the issue. [mention]oldgeek [/mention] I didn’t even realize until now that I did not thoroughly check port timings on the Athena. I had all kinds of issues with the Polini bore I had and by the time I got the Athena, I just got transfers and squish proper and then slapped it together. I did do a half assed measurement of them now that I think of it, but I wasn’t very thorough and remember thinking they seemed tame. I think I got distracted before I exerted any more effort. I wish I had checked better now... |
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Post by Kenho21 on Jul 18, 2020 8:47:17 GMT -5
[mention]zino [/mention] Did you check port timings on your Athena?
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