Question about 1986 Honda XR 600 R

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Honda xr600r cutting out at 3/4 & full throttle

With stock jets & new stock air filter it cuts out at top end unless you take air boot off no. 2carb then it rev up or put old air filter on & leave side cover off it will rev up what wrong.

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  • wbstaton Jun 03, 2009

    it was a stock air filter

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When you put on a new air filter you have to rejet the carb in order for the air/fuel mixture to be correct,because with a aftermarket air filter it is allowing more air in than before and not enough fuel. as the piston speeds up upon exceleration the air is not getting burnt off into exhaust because you do not have enough fuel in the mix

Posted on Jun 03, 2009

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I have a 2006 YZ125, that has pretty much been just garage kept since bought new in 2006. I've cleaned the carb and jets and cleaned the plug. The jets were gummed up but its still cutting out high rpms or...


Hi, Jamie it should be noted that your performance issues are not electrical ie. faulty charging system, battery condition, and connections etc. If your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have nice a day.
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1997 honda magna vf750c slow to accelerate re jetted k& n filter & pilot screws out 2 7/8 turn


Hi, Dgoyette4 and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Pinholes or torn diaphragm.
6. Accelerator pump leaking or no output.
7. Plugged bowl vent or overflow.
8. Fuel level in bowl too low.
9. Restricted fuel supply passages.
10. Plugged jets or passages.
11. Worn or damaged needle or needle jet.
12. The enrichner valve/choke not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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2007 CRF 450 R- from 1/2 TO full throttle it backfires and cut out,as soon as you release the throttle it comes back to normal.Below 1/2 throttle all is fine.Cleaned the carb ,checked all jets and fuel...


This can only be lack of fuel for some reason backfire is nearly always lean fuel condition and the cut out pretty much confirms lean or no fuel?
I would be checking the size of main jet (they numbered) double check it is factory size? I would check the needle clip position god knows why but people change the position so double check it is factory setting (usually 3 or 4 notches from top is factory setting I forget which one it is for Honda's) I would double check your air filter is clean and/or not oil drenched
refer to your manual or ring your Honda dealer for all the specs
Some other possibilities would be spark plug fail at high load (but unlikely?) stator failing at high RPM ( unlikely but worth the two minute multi meter test to make sure resistances is still in spec)
good luck regards Jamie

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1 Answer

2006 yamaha rhino 450 cuts out at high speed 30mph used to get almost 40. Has after market cdi kn air filter rejetted 2 richer. runs great slow to mid range even full throttle in sand is good...just high...


I would double check compatibility and wiring hook-up of the A/M CDI. See if the previous jets (if undamaged) improve top end. The leaner, the meaner!

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1 Answer

It cuts out at full throttle.


Check the muffler and air cleaner for plugging. Try turning the H jet needle CCW about 1/2 to 3/4 turn which should make it 4-stroke at full throttle. Proper setting is for the engine to 4-stroke at full throttle, but immediately 2-stroke when cutting. (CW turning of H makes it leaner) See a Poulan servicing dealer for a rebuild kit. Be sure to check the fuel filter in the tank for plugging. Hope this helps!

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My 2006 buell blast is cutting out at about 3/4 throttle


Hi, Jefferyjoe the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or damaged battery, 9 volts or lower.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. Gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
For more information about your issue and free downloads that you need please visit the websites below and for specific information or questions, please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
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99 cr80 starts but cuts out at the top end of 4th gear. jets and carb clean air filter clean just had a new top end and new packing in exhaust


cuts off or breaks up?? if it breaks up it could be a couple of things bad reeds or electrical like stator or cdi bog ign coil check those

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2005 450r dies at full throttle


Sounds like dirt in the main jet of the carb. Take the slide out and clean the needle. The pull the float bowl and blow air or carb cleaner through the brass jet in the middle of the barb, where the needle seats.

Jul 01, 2009 | 2005 Honda CRF 450 R

1 Answer

Hard starting;has stock jets.


Install a new stock spark plug after getting the compression checked and the valve clearances checked. Assuming good compression, use the choke when cold starting but don't flood the engine. Clean the air filter? If, when running, the bike dies when the throttle is turned, remove the jet needle from the throat of the carb and move the clip on the needle down one, possibly two, notches. This will richen the low end mix.

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