Magician CUTS OUT at full throttle.. Any ideas?

davisbm2 · 10-11-2018, 10:09 AM

Hey!

I love my Magician. After a carb tuning, a new LED display, and some valve adjustments she starts right up every time.

HOWEVER when I am at full throttle, and only at full throttle (7/8 throttle wont do this) the bike will cut out suddenly. Its like the RPMs just drop. My first thought was a fuel issue but it is less of a "bogging" feeling more of a sudden loss of power.

The loss of power is sudden but the bike keeps going fine, it doesn't kill the engine just slows it, which at 50mph can feel like tapping the brakes without you planning on it. A bit scary.

I have gone smaller with my main jet, and larger with my main jet. Has the same problem regardless. I have the upgraded NGK spark plug, maybe a poor coil? Could it be reeds? Maybe even a valve problem?

Any ideas?

Red Hawk · 10-11-2018, 10:30 AM

My Hawk PZ30 carb did this when I got too optimistic with rejeting the main jet size. I drooped down 2 sizes and it went away. I could barely make it up a hill downshifting and all.

**JerryHawk250** · 10-11-2018, 10:36 AM

Since you tried different jets that should rule that out. What size jets? Did you get true mikuni jets or the cheap set they sell on ebay and amazon? these are know for being inaccurately labeled. Visually inspect the jets and make sure they are different sizes. If the jets are good then it could be a weak coil or just a bad ground causing a weak spark.

davisbm2 · 10-11-2018, 11:39 AM

I got mid range jets off of Amazon, I think the ones recommended from Motocheez.

I can't remember what size is in there right now.. But the stock one was making it run very lean, so I went up one size and it ran much better but could be hard to start.... I then jumped up one more size and it has been very happy, minus the cutting out problem at full throttle.

What size jets are you guys running? Also, can I visually check the strength of the spark, or should I use a multimeter?

davisbm2 · 10-11-2018, 11:42 AM

Also, I don't know much about reeds, do I need to be worried about them with an 8 month old bike with 500 miles? Are there any known issues with RPS Hawk/ Magician reeds?

Red Hawk · 10-11-2018, 12:00 PM

2 strokes have reeds

4 strokes have Valves

Unless there's something new out there?

davisbm2 · 10-11-2018, 09:54 PM

Ah.. That moment when you learn something you should have known years ago..

So, let's get creative here... What else could cause my full throttle cutting out issues? I'm leaning towards electrical at this point..

thanks!

**JerryHawk250** · 10-11-2018, 10:11 PM

What size jet do you have in it now?

Red Hawk · 10-11-2018, 10:36 PM

I'd make a guess it's fuel or spark, Not air. I had a bad plug wire it would ground out and spark from the wire to the block, it killed the power band. I could only see it in the dark. I knew there was a problem I just couldn't find it.

Or Something can be off in the carb? Wrong jet, miss marked. Needle valve not installed correctly or what ever "this" problem from what you've said would be too much fuel on the main jet circuit.

Engine runs flat at full throttle but would have a huge power band, right?

Red Hawk · 10-11-2018, 10:44 PM

Also I installed an in line fuel filter, nice one too. It wrecked the fuel flow and made the engine run like trash at full throttle. Bought a cheep looking filter and it's perfect

Just an idea, sorry, kinda hard to fix by message, there's good people here, you'll get it !

pete · 10-12-2018, 01:20 AM

When you say full throttle...
is this full throttle as in the twist grip
or full throttle as in max revs..

...

wheel spinner · 10-12-2018, 08:55 AM

if this was a problem on my Roketa I would look at fuel flow... also carburetor problems... staving for fuel... an ignition problem will be a problem through out the rpm's... but a fuel problem wot would probably be low fuel in the bowel and star staving for fuel... check your float settings...

10-11-2018, 10:09 AM	#1
davisbm2 Join Date: Apr 2018 Posts: 54	Magician CUTS OUT at full throttle.. Any ideas? Hey! I love my Magician. After a carb tuning, a new LED display, and some valve adjustments she starts right up every time. HOWEVER when I am at full throttle, and only at full throttle (7/8 throttle wont do this) the bike will cut out suddenly. Its like the RPMs just drop. My first thought was a fuel issue but it is less of a "bogging" feeling more of a sudden loss of power. The loss of power is sudden but the bike keeps going fine, it doesn't kill the engine just slows it, which at 50mph can feel like tapping the brakes without you planning on it. A bit scary. I have gone smaller with my main jet, and larger with my main jet. Has the same problem regardless. I have the upgraded NGK spark plug, maybe a poor coil? Could it be reeds? Maybe even a valve problem? Any ideas? Last edited by davisbm2; 10-11-2018 at 11:40 AM.
	0

10-11-2018, 10:30 AM	#2
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	My Hawk PZ30 carb did this when I got too optimistic with rejeting the main jet size. I drooped down 2 sizes and it went away. I could barely make it up a hill downshifting and all. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
	0

10-11-2018, 10:36 AM	#3
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,721	Since you tried different jets that should rule that out. What size jets? Did you get true mikuni jets or the cheap set they sell on ebay and amazon? these are know for being inaccurately labeled. Visually inspect the jets and make sure they are different sizes. If the jets are good then it could be a weak coil or just a bad ground causing a weak spark. __________________ 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	0

10-11-2018, 12:00 PM	#6
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	2 strokes have reeds 4 strokes have Valves Unless there's something new out there? __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
	1

10-11-2018, 10:11 PM	#8
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,721	What size jet do you have in it now? __________________ 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	0

10-11-2018, 11:39 AM	#4
davisbm2 Join Date: Apr 2018 Posts: 54	I got mid range jets off of Amazon, I think the ones recommended from Motocheez. I can't remember what size is in there right now.. But the stock one was making it run very lean, so I went up one size and it ran much better but could be hard to start.... I then jumped up one more size and it has been very happy, minus the cutting out problem at full throttle. What size jets are you guys running? Also, can I visually check the strength of the spark, or should I use a multimeter?
	0

10-11-2018, 11:42 AM	#5
davisbm2 Join Date: Apr 2018 Posts: 54	Also, I don't know much about reeds, do I need to be worried about them with an 8 month old bike with 500 miles? Are there any known issues with RPS Hawk/ Magician reeds?
	0

10-11-2018, 09:54 PM	#7
davisbm2 Join Date: Apr 2018 Posts: 54	Ah.. That moment when you learn something you should have known years ago.. So, let's get creative here... What else could cause my full throttle cutting out issues? I'm leaning towards electrical at this point.. thanks!
	0

10-11-2018, 10:36 PM	#9
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	I'd make a guess it's fuel or spark, Not air. I had a bad plug wire it would ground out and spark from the wire to the block, it killed the power band. I could only see it in the dark. I knew there was a problem I just couldn't find it. Or Something can be off in the carb? Wrong jet, miss marked. Needle valve not installed correctly or what ever "this" problem from what you've said would be too much fuel on the main jet circuit. Engine runs flat at full throttle but would have a huge power band, right? __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
	1

10-11-2018, 10:44 PM	#10
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	Also I installed an in line fuel filter, nice one too. It wrecked the fuel flow and made the engine run like trash at full throttle. Bought a cheep looking filter and it's perfect Just an idea, sorry, kinda hard to fix by message, there's good people here, you'll get it ! __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
	0

10-12-2018, 01:20 AM	#11
pete Join Date: Jan 2012 Location: ChCh , NZ Posts: 2,266	When you say full throttle... is this full throttle as in the twist grip or full throttle as in max revs.. ... __________________ 09 XT660R ... 06 TTR250 ... 80 Montesa H6 125 Enduro... 77 Montesa Cota 348 MRR "Malcom Rathnell Replica"... Current resto projects.. 81 Honda CT110... 80 Kawasaki KL250A1... 11 Husaburg TE125 enduro... "sold" along with another 31... Lifan 125 Pitbike.. "stolen" ... KIWI BIKER FORUM...... http://www.kiwibiker.co.nz/forums/content.php All the best offroad rides in NZ... http://www.remotemoto.com/ E-mail... xtpete1@gmail.com
	1

10-12-2018, 08:55 AM	#12
wheel spinner Join Date: Nov 2017 Location: Suffolk Va. Posts: 146	if this was a problem on my Roketa I would look at fuel flow... also carburetor problems... staving for fuel... an ignition problem will be a problem through out the rpm's... but a fuel problem wot would probably be low fuel in the bowel and star staving for fuel... check your float settings... __________________ 2006 Roketa DB-07-200 Dual Sport 2007 Monte Carlo SS 5.3 2010 Challenger Hemi 5.7 2004 Isuzu Rodeo 1998 Kia Sportage 4x4 2004 Toyota Tundra 2016 Ford Escape Guitars 1970 Gibson SG mint Condition 2005 Epiphone white Custom SG Les Paul L/New Fender Banjo New Condition BC Rich Bitch - Like New\ 3 Jay Turser SG Good Condition Amps Marshall vs100 Good Condition Acoustic 261 very good condition Boss GT-6 Pedal effects Like New
	1