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Post by hellish100 on Mar 12, 2018 21:29:50 GMT -5
I am running carbon fiber malossi reeds, but I think I still have the stock steel ones.
For transmission, I am running the full la furia rossa trans kit that with the 5.5grams.
Good call on the pilot jet! I'll get an order going with treatland. I bought the bigger pilot jets because I thought I needed to go bigger.
Thank you so much! I'll keep y'all posted!
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Post by 'O'Verse on Mar 13, 2018 7:45:24 GMT -5
Genuine 21mm Dellorto with a 54mm bbk. Main jet should be around 93-95 region. I think it comes with a (92). Idle jet you could just use what came in the Dell stock to get it started (50) Along with the stock (60) starter jet. Then play around with it later. The 90cc deptartment likes to hang around the 9,000-10,000rpm range. So your rollers might be a little light. Depending on how the la Furia Rossa acts. 6-7 grams normally. But you'll find that out later. Definetley check your timing and your plug gap.
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Post by oldgeek on Mar 13, 2018 18:28:32 GMT -5
Are you running a pod style filter?
A stock airbox with the snorkel removed may help ease tuning woes. Consider using one initially to get it running good, then move to a free flow/retune after you are confident it will run right.
Awesome build!
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Post by hellish100 on Mar 13, 2018 23:18:02 GMT -5
Good call on the air box!
I was running a cheap pod filter.
I have a bug eye zuma airbox that will do the trick.
I’m waiting for pilot jets now.
If I am not mistaken, two strokes run far better with an airbox anyways. I may keep the box if it matches the torque delivery that these 90s are known for.
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Post by hellish100 on Mar 15, 2018 20:00:59 GMT -5
Got my idle jets from treatland super fast!
I threw a 30 idle jet with a 95 main.
Running 30:1
Air screw is .5 turns out.
Running a Zuma airbox with a 21mm Dellorto carb.
When I crack the throttle, it'll back fire and die.
At least it's at the point where I can get it running long enough to check timing.
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Post by benji on Mar 15, 2018 20:49:08 GMT -5
I would go up to a 35 or 40 pilot jet, and back down the premix ratio to 40:1 and mix screw at .75 to 1.25 turns out.
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Post by hellish100 on Mar 15, 2018 20:59:06 GMT -5
Lucky for me, those are the other two idle jet sizes I bought!
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Post by repherence2 on Mar 15, 2018 21:02:16 GMT -5
Hi Hellish, I was reading through your thread and I have a few questions.
Does your rear pulley have straight slots or dual-angle slots? What rpm range are your clutch and contra springs? How heavy are your roller weights?
I'm running a 54mm Taida bore, 28mm OKO carb (no filter but I use mesh from a tea strainer to cover the carb mouth. The mesh is held in place by a polini bell mouth. I also modified my carb and installed an aluminium plate that is positioned at the equator of the carb mouth, splitting the mouth into two halves. This plate goes from the start of the carb mouth and to the front of the carb slide.), CT intake manifold and reed valve, and a YMS V8 pipe.
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Post by ryan_ott on Mar 15, 2018 21:07:23 GMT -5
Just a thought here the dell carbs are very tuneable and the needles change the whole character of the carb. Once you get it running you may want to try different needle tapers. They can richen or lean different areas of the throttle range.  |
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Post by hellish100 on Mar 15, 2018 21:36:07 GMT -5
Hi Hellish, I was reading through your thread and I have a few questions. Does your rear pulley have straight slots or dual-angle slots? What rpm range are your clutch and contra springs? How heavy are your roller weights? I'm running a 54mm Taida bore, 28mm OKO carb (no filter but I use mesh from a tea strainer to cover the carb mouth. The mesh is held in place by a polini bell mouth. I also modified my carb and installed an aluminium plate that is positioned at the equator of the carb mouth, splitting the mouth into two halves. This plate goes from the start of the carb mouth and to the front of the carb slide.), CT intake manifold and reed valve, and a YMS V8 pipe. Hi repherence! I am running a malossi OR kit. The pulley has two choices for the ramp rate. I think I set it to just the straight ones. The clutch springs are the original ones that I got with the motor. I have no idea what they are! Haha! I used the contra spring that came with the OR kit. I have no idea on that either! The roller weights are 5.5 grams. The pain with these CVT scoots is there are the variables of the CVT that can be mistaken for how the actual engine is running. A guy on one of the facebook scooter groups is selling a fixed pulley trans kit to use to tuning and dyno sessions. Just install your clutch and replace the CVT with it and tune away. I'm def going for that some day! |
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Post by hellish100 on Mar 15, 2018 21:37:07 GMT -5
Just a thought here the dell carbs are very tuneable and the needles change the whole character of the carb. Once you get it running you may want to try different needle tapers. They can richen or lean different areas of the throttle range. Thank you Ryan! I am running a W7 right now. From my searching of Del carb tuning, the W7 is a safe spot to start from. Onward and upward! |
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Post by repherence2 on Mar 16, 2018 1:11:17 GMT -5
I agree with what 90GTVert said on the previous page about the Peace Pipe. You might want to use a YMS for now, power range is fairly wide, it ain't a rocketship but its easy to tune with. That Peace Pipe probably needs more RPM, like you need a clutch that you can stall to a higher RPM, stiffer clutch springs for sure or an adjustable clutch. I'm running a Stage6 with red springs pulled pretty tight. That stock clutch engages too low for your bore/pipe combination.
I'm running 4.4g rollers, keli variator, adjustable clutch, NCY yellow (medium) contra spring. YMS Sectional pipe for 100 BWS. The first one I had, the internal baffle plate broke and cracked and it got loud. I replaced it with a black can YMS V8 for 50/70cc and it worked well. Along the way I found a used YMS 100 at a shop and that is the current pipe. My idea is that a black can V8 might help you get this carb tuning done easier. That, and either stiffer clutch springs or and adjustable clutch. The pilot jet seems pretty big because in the case that holds my tuning jets I have a 45 and a 50, I need to check my jets tomorrow after work. But that's on a 28mm OKO
--Hawaii style overkill because the OKO 28's are practically the same price as smaller OKOs here--
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Post by hellish100 on Mar 16, 2018 7:53:40 GMT -5
I had an interesting thought on my way into work this morning:
I have a genuine Yamaha Bug Eye motor that I was planning on swapping into a Razz.
Since this entire project is being built with the intention of bringing it on a track, I think starting with the 50cc and building it to a 70cc would be better.
The 90cc I can swap into the Razz and give the carb and pipe to the 50cc.
Putting on the stock carb and stock 90cc pipe will make it behave easier.
What are y'all thoughts? I think it is common knowledge that a 70cc is going to be higher revving and can destroy a mild 90 with half of the development time.
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Post by AtariGuy on Mar 16, 2018 9:08:01 GMT -5
The new high end 52-54mm cylinders are really pushing new boundaries lately, don't give up hope. Besides, 190's peace pipe matches a 90 build, it'll destroy the competition!
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Post by hellish100 on Mar 16, 2018 10:18:34 GMT -5
You’re right, I’ll just have to build both.
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