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Post by ultrasuede on Feb 5, 2018 17:21:22 GMT -5
21mm flat slide carbie is on! But having an issue with backfiring and stuttering at high rpms that's been getting worse (won't even break 40 on the Speedo). After ruling out the jets, reeds and transmission, we got to the stator and ignition coil. The voltage drops to the plug significantly when in WOT. I have a replacement stator, pickup and coil on its way. I'm hoping that the stock electrics can handle high rpms. If not, I might have to Jerry rig a car ignition coil.
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Post by pinkscoot on Feb 6, 2018 21:49:07 GMT -5
Is that pipe melting or hitting the plastic fender?
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Post by ultrasuede on Feb 7, 2018 0:49:28 GMT -5
It's not melting but it does hit the fender if I go over a big bump
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Post by pinkscoot on Feb 7, 2018 20:42:32 GMT -5
I had that problem on my Pink scoot that's a Vino clone. It melted the fender. I saw an exhaust on an ET2 where they modified the stinger to turn down so they had clearance.
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Post by ultrasuede on Feb 15, 2018 7:25:29 GMT -5
Alright fellas, after finding a fault in the ignition and replacing the stator, pickup and coil, we are almost home. But we have a problem.
At WOT, it stutters and loses power. At half and even 3 quarter throttle, she runs beautifully. Revs high, accelerates smoothly. But it just runs like poop at wot. The setup is:
Stage6 racing 70cc mkii
Yasuni C16
Naraku HPC crank
Motoforce Reed/manifold combo (with an insert installed)
Stage6 racing flat slide carb 21mm mkii
Stage6 variator (not oversized) with 3g and 6g weights
Stock clutch with strong stiff springs and medium contra spring.
The carbie jet is 100 at the moment. 95 is too lean and 105 is too rich. I don't have a 98 or 102 to try.
The throttle needle is in the top position.
It sounds like it's too rich. My top suspicions are the throttle needle position or the reed insert. Any other thoughts? I'm desperate here!
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Post by Lucass2T on Feb 15, 2018 9:05:52 GMT -5
Ignition....had exactly the same with my 70mph axis (kinda the same setup).
Swapped the (faulty) athena cdi which i bought 2nd hand off of an auction site with a stock unit and all problems disappeared...
You can encounter the same problems with a faulty plug. It come down to this, on full load when the combustion chamber is densly packet with mixture the ignition system isnt able to create a spark. The mixture acts like an insulator.
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Post by ultrasuede on Feb 15, 2018 14:50:33 GMT -5
Brand new stator, pickup and coil. No CDI on the ET2. New B9ES plug and lead too
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Post by ultrasuede on Feb 15, 2018 14:52:34 GMT -5
It also gets up to high rpm fine if I'm just below wot. Stutters at wot regardless if it's from stationary or moving fast. I'll put up a video in the next day or so
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Post by pinkscoot on Feb 15, 2018 21:14:40 GMT -5
Brand new stator, pickup and coil. No CDI on the ET2. New B9ES plug and lead too Its a coil on a CDI, same as my Italjet and Velo. |
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Post by 'O'Verse on Feb 15, 2018 22:19:02 GMT -5
Float bowl adjustment. Carb might be running out of gas. Does it recover if you back off? Had the same problem. Bent the tabs to raise the float higher. Just a guess.
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Post by ultrasuede on Feb 16, 2018 4:35:24 GMT -5
Doesn't lag after wot. Goes right back to normal. If if back off a bit it's fine. Just at wot
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Post by Lucass2T on Feb 16, 2018 7:02:55 GMT -5
Pull off the airfilter and see what happens at wot. If nothing happens try restricting airflow and try again. Is the carb under an angle (possible lean/off fuel metering conditions)?
If your problems are the way I interpret them its an ignition problem. Otherwise id wanna be reading more about black or wet plugs and difficult starting, sluggish pickup and high fuel useage.
Is the ignition system properly grounded? Is the plugcap seating properly on the plug. Are you using a silicone cap (prone to bad seating) or the stock plastic one?
Are the swapped ignition parts brand-new or slightly used/2nd hand?
Did you do a leak down test or spray all the gaskets with brake parts cleaner to spot air leaks? I havent read about high and uneven idling or bad idle.
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Post by ultrasuede on Feb 16, 2018 7:11:16 GMT -5
New ignition parts including the spark plug cable and a new loom. It has fixed timing, but it revs out at partial throttle. It's 4 stroking at wot. Doing my head in!
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Post by pinkscoot on Feb 16, 2018 9:54:02 GMT -5
When you say revs out at partial throttle do you mean that when you open it a little the revs go up? That would mean a leak somewhere.
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Post by ultrasuede on Feb 17, 2018 1:26:20 GMT -5
Partial throttle it revs fine. From start to about half way it's all good. Only wot.
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