jayrod427
Scoot Enthusiast
Posts: 114
Location: Kansas
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Post by jayrod427 on Jul 31, 2020 10:13:04 GMT -5
Hi all! Newb here. First post probably like many first posts. I'm not sure if this is the right place to start a build thread, but here goes.
I've got a 09 Zuma that I've had for several years. Now I'm beginning the up the power and speed phase. Tired of cruising 30-35 mph around town all the time.
A little history on the bike it has an expansion chamber exhaust already on it, and the carb has been replaced with an Ebay special. I don't know what the carb is but the stock air inlet fits it, it takes the same 6mm jets, electric choke, and it has a fuel mixture screw rather than air.
Recently I have gotten rid of the oil injection as it would fill the carb with oil if it sat more than a week or so. Pre-mixing at 40:1 with yamalube 2r. I also changed the 7.5g variator weights to a mix of those and 4.3g that were supposed to go with the pipe giving 5.9g. It was supposed to get "red" springs that came with the pipe but upon trying to install those the springs are wrong and not longer on one side to fit the clutch notches, so for now it's still stock springs in the clutch. Also upjetted to a 90 right now, did a plug chop and seemed was not overly lean or rich. I started conservatively with a 95, but going to the 90 ran and responded better.
The pipe/rollers made a slight difference and now runs 35-37 depending on terrain on a good day with minimal wind.
With all that said I have ordered from scootertuning.ca a Naraku 70cc jug and head, the scootertuning brand "reinforced clutch spring", a roller set from 3.5-5g, and a new reed valve.
I would like some input from you seasoned experts for a starting point on tuning. Should I use the 70cc Naraku head, or try the stock head with compression bump? Any recommendation where to start on variator weight? any recommendation where to start on main jet?
Thanks for input and now that I have dove into the mods world I'm sure I'll be on here quite a bit now.
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jayrod427
Scoot Enthusiast
Posts: 114
Location: Kansas
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Post by jayrod427 on Jul 31, 2020 10:18:44 GMT -5
Also forgot to add I have a tach showing up today to help track improvements/changes, and need to get a temp gauge to dial in the tuning. Neither the tach or temp guage will stay permanently, just tuning tools.
I also should add the pipe on it is the "FLY" which I saw in another post is junk. But another couple hundred $$$ isn't in the budget right now. I'd have to assume it's inferior to others, but not worse than stock.
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Post by geoffh on Jul 31, 2020 14:42:11 GMT -5
Hi sounds like your on the right track,you will need a pen and paper to take notes,the best way to mod your scoot is to change one thing and test and record,so if you have the time fit the jug and old head and see how that goes then the new head and compare,once that's running tune the CVT to your new set up.
Geoff
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Post by Zino on Jul 31, 2020 16:54:12 GMT -5
I agree with Geoffh Go slow . The Naraku with the stock head has gotten very good reviews for its spunkiness because it does push compression. The Fly might not be the best pipe but it is way better than the the stock zuma one that was on the 2009 .
If your jetted safe already for your pipe,I would not expect any change when you swap on the kit Possibly a needle clip change since you would spend more time at part throttle with the extra power .
I would keep the temp gauge on the scoot I have them on every build protect your investment the tachs are great for tuning.
As far as temps you want to be jeted so you never see large spikes and you want your scoot to live below 350 degrees on long wot runs .
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Post by Zino on Jul 31, 2020 17:44:13 GMT -5
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Post by aeroxbud on Jul 31, 2020 18:51:24 GMT -5
A lot of people are liking the Naraku kit. It should make a very good improvement over standard. It's hard to suggest a weight roller. Exhaust, contra spring and variator can all make a difference to the ideal weight.
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Post by Steve B on Jul 31, 2020 20:43:50 GMT -5
Do not forget the most important tuning tool of all "the marker".
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jayrod427
Scoot Enthusiast
Posts: 114
Location: Kansas
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Post by jayrod427 on Jul 31, 2020 22:47:10 GMT -5
Well tonight added the tach, and led headlights. The lights made a huge difference once dark. Wired them both on with homemade relay with direct battery current since stator made one flicker, and on wouldn’t come on at all. Unfortunately I made the relay trigger off of key power since the stock wires neither one would trigger the relay, just buzz and flicker. By doing so the lights are on when starting and it cranks pretty slow. Need to add a cutoff switch for starting, and run each relay trigger through the switch so low is only one light, high is both. Seemed to drain the battery a bit as well with both on. The leds are supposed to draw 25 watts.
Rode about 20 miles tonight. Think need to drop idle a little. Need small adjustment on the screw too. Dead cold fires right up, warm restarts have to give a little throttle input to stutter and start. Was about 2200 warm, and clutch was trying to just barely grab and made idle shake a little. Upon wot takeoff would stumble just a sec, then zoom to about 6500. Then about 25 mph rpm would climb with speed. Ran about 35-37 steady, 40+ with favorable hill. 37 was about 7600 rpm, 40 8,000 or so.
My main goal is maintain 40-45 whether hills or wind or whatever. 99% of roads I’d travel are 40 mph, and dropping with hills or wind annoys the other drivers. Temp gage will be here before the jug so that’ll be good.
I read brents write up couple days ago on the install! Also read his oil pump removal. One question that wasn’t entirely clear. Can you remove the pump without taking off the drive gear from the crank? And do you need to plug the hole? I’m a fair weather rider so never any chance of rain or anything off-road.
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jayrod427
Scoot Enthusiast
Posts: 114
Location: Kansas
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Post by jayrod427 on Jul 31, 2020 22:52:38 GMT -5
Do not forget the most important tuning tool of all "the marker". From what I gather this is for marking the belt pulleys to see where they ride?
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Post by Steve B on Jul 31, 2020 23:50:58 GMT -5
You would be correct jayrod427.
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jayrod427
Scoot Enthusiast
Posts: 114
Location: Kansas
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Post by jayrod427 on Aug 1, 2020 0:00:05 GMT -5
And the internets won this battle. After some digging on the Fly exhaust seems it’s pretty well useless upgrade. Got a Yasuni Z coming. Nice dyno comparison on tuningmatters. I like it’s peak range being around that 40-45 mph rpm range I currently run. And real decent price point. Some of the others make more, but higher rev range. Might return the 72cc if better pipe solves my woes. Lol
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Post by Zino on Aug 1, 2020 0:34:06 GMT -5
Yasuni Z Now you are playing with some power . Very Crank friendly Stays below 10 k rpms . Easy to set up wide power band for expansion pipe . Its power band will be wider as far as rpms then your current pipe and more power in the band. My 12 year old Son just loves the Yasuni sound . Loud and Proud . He can hear me coming from a block away. There are 2 restrictions to remove on it . IF you bought from Scootertuning.ca they have the one in the silencer already gone . You have to dremel one out in the manifold
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jayrod427
Scoot Enthusiast
Posts: 114
Location: Kansas
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Post by jayrod427 on Aug 1, 2020 0:43:50 GMT -5
Yasuni Z Now you are playing with some power . Very Crank friendly Stays below 10 k rpms . Easy to set up wide power band for expansion pipe . Its power band will be wider as far as rpms then your current pipe and more power in the band. My 12 year old Son just loves the Yasuni sound . Loud and Proud . He can hear me coming from a block away. There are 2 restrictions to remove on it . IF you bought from Scootertuning.ca they have the one in the silencer already gone . You have to dremel one out in the manifold Yessir. Yes from scootertuning, and yes manifold restrictor will come out. This fly isn’t exactly quiet so should be similar.
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Post by Zino on Aug 1, 2020 0:58:49 GMT -5
The pipe by itself should put you mid 40's You will need those medium possibly hard clutch springs to get up in the start of the powerband You might be a little light on your individual weights . You can remedy that by cutting 6 pieces of aluminum foil the same size and roll them up and stuff in each roller to really dial in the right weight . Swap on the pipe dial that in first and enjoy what a real pipe does all by itself for a 3-4 tanks of gas . Make sure your jetting is spot on you will be turning possibly 1000 more rpms than before . This way if you make a tuning mistake you do it on the old cylinder. Wait for a rainy weekend swap on the naraku the jetting and cvt should carry over nicely from what the pipe needed . Pipes cause the biggest jetting and cvt changes on this level of build .
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Post by Zino on Aug 1, 2020 0:59:52 GMT -5
Post up sig line So we can see what scoot your running and what mods over stock it will help guys at a glance that want to copy your build and also lets us assist you .
And as you build it up post up some pics of any challenges you come across or just how cool your scoot looks .
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