Question about Honda VF 750 C Magna Motorcycles

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Engine starts, idles but won't rev up, have installed new spark plug as specified in the manual...

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  • A Miller May 11, 2010

    Are you still mechanically connected to the carb via both cables from the throttle?

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Mowing at mid throttle, suddenly the engine started over revving. Acts like governor isn't working. Every time I try to restart it instantly starts to over rev.


According to Amie Taylor on http://homeguides.sfgate.com/lawnmower-revs-up-down-100220.html "Airflow Issues A lawnmower that hunts and surges may be experiencing something as simple as an airflow issue. If the air that the engine requires to run is blocked, especially sporadically, it can cause the engine to slow down. When the blockage moves or clears, the engine may suddenly rev up in response. To fix this type of problem, check the air filter to ensure that it's not clogged with dirt and debris. Check the vented gas cap as well. Both issues can cause reduced or sporadic air flow, and clearing them will fix the problem.
Spark Plug Problems Another problem that can cause revving and dying of a lawnmower engine is a faulty or poorly adjusted spark plug. Check the spark plug to see if the wire is connected to it firmly and not wobbling about. If it is connected correctly, remove the spark plug to see if it's covered with corrosion. If so, a simple scrubbing with a wire brush can restore it to working order. If necessary, replace the spark plug with a new one. Check the spark plug gap with a spark plug gauge to ensure that it's adjusted to the proper setting recommended in your owner's manual.
Carburetor Adjustment A carburetor that's incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. One screw controls the idle speed while the other adjusts the idle mixture. Check the manual if you're unsure of the location of the idle adjustment screws. Start the mower and allow it to run for 5 minutes. Then slowly adjust the screws tighter or looser in turn until the mower runs and idles smoothly.
Fuel Problems A particularly simple fix that can be at the bottom of many lawnmower idling problems is old or contaminated fuel. If the fuel has been left in the mower while it was stored over the winter or while the mower has remained unused, drain it and replace it with fresh fuel. If you have gas-powered blowers and trimmers that use a mixture of 2-cycle oil and gasoline, check to see that you've not placed that mixture in the lawnmower inadvertently."

May 10, 2015 | Garden

1 Answer

My yam ybr 125 will not rev out fully. in top gear at 50 mph 7000 revs that's it . the spark plug looks lean more white ish .but all setting are to the manual .thanks


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
03 TTR 125 won rev but idles fine TTR
bike will not rev past 8k like hitting the rev limiter
YAMAHA YBR125 Owner Manual
OEM parts for Yamaha
http://www.svracingparts.com/wp-content/uploads/2014/05/mr125_service_manual_eng.pdf

Aug 29, 2013 | 2006 Yamaha Ybr 125

1 Answer

Zafira 1.8 petrol 03 runs rough for 30/50 seconds when started then ok but a little sluggish


The "won't rev" part sounds like a preventative so you won't destroy the engine from cold start-up. The sluggish part sounds like bad fuel or spark plugs. Where do you buy your fuel and what octane is it? and have you Changed your plugs?

Jun 25, 2012 | Cars & Trucks

1 Answer

Stihl BR600 leaf blower starts but won't make any power. This blower was bought brand new in 2009 I think. I haven't really done anything to it and it has always ran great. I have always used the...


Check the air filter and clean or replace if needed. Clean or replace the spark plug. Check the in-tank filter as well (located in the tank attached to a freely moving fuel line) Also, the Stihl 2-stroke machines have a spark arrestor screen located at the outflow port of the muffler, either in the form of a bolt nozzle, or screen plate. Remove that screen and clean it or replace it if its dirty. Clogged exaust is a typical problem! All of these things are VERY easy to do, good luck!

Sep 26, 2011 | Garden

1 Answer

Service Engine light is on, gas milage is poor getting est. 9mpg city (average 1990 dakota est. 20 mpg city) I put in a new airfilter in car, did a oil flush, changed oil and oil is still clean after 50...


if you have'nt replaced those spark plugs and wires lately, you need to.and also, lucas fuel treatment, in my personal opinion,is the very best for unclogging fuel lined and injectors.it being below a 1999 model and your check engine light is on, you can have it coderead for free if you're near anautozone or advance automotive parts store. they will code read it and tell you why that check engine lights coming on.hope this helps and thank you for choosing fixya.com

Nov 23, 2010 | 1990 Dodge Dakota

1 Answer

1986 Yamaha FZ750 - engine will start and idle - won't rev up. (engine quits)


Hi, Carefree22 and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
13. Multi carburetors not in sync.
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.
Bayou 300 idles but won rev
my bike starts runs idles perfectly but will not rev
1985 1988 YAMAHA Genesis FZ750 Service Manual Repair Manuals AND Owners... $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Sep 20, 2010 | 1986 Yamaha FZ 750 TV (Europe)

1 Answer

Why wont my chainsaw tick over, it revs up but not tick over. also, cannot start it after 2-3 mins of usage, why?


Check the air cleaner and muffler for plugging. Try turning the idle speed screw (not the L jet screw) CW one full turn. Does it now idle? If the chain keeps turning at idle, back off the speed screw until the chain stops after revving the engine. When the engine won't start, remove the spark plug and check for blue, snappy spark. If the plug insulator is black, try a new correct type plug. If sparks ok, then squirt some fuel mix into the plug hole, replace the plug and try to start. If you get a pop or two, then fuel delivery is a likely problem. If it again runs, the plug may have been the problem. Otherwise, check the fuel filter, fuel line, and carburetor for any loose fasteners. Finally, run the engine at full throttle--it should 4-stroke with no load, but immediately 2-stroke when cutting. Adjust the H jet needle to achieve this. hope this helps!

May 19, 2010 | McCulloch 16 Inch Gas Chain Saw MCC1635AK

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