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Motor cross bike

The bike is reving up and down and i just put a new inlet rubber on and it is still doing the same

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If it is a 2-stroke engine u might have a problem of a crank seal that is worn.take quickstart and spray it around the suspected  area while bie is running.ideling will increase dramatically if substance is sucked in at  the air leak.check for warn or loose needle situated underneath carb slider.dont b shy to ask!

Posted on Nov 02, 2007


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Just got 75 GL1000 the spark plug wires # 1and 2 are in back of motor not frontt they are back wards it idles fine **** reves slow is it out of time are coils backwards

If you crossed them up then the plugs are bad now,you will need to replace them.From the front of the bike, sitting on it;
Right side, 1 & 3.
Left, 2 & 4.

Aug 13, 2017 | 1975 Honda GL 1000 (K1)

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Bike is reving but losing power

The loss of power is usually due to the need for a valve job. Do a compression check. If compression is lower than 120 psi a valve job is called for. While you have the head off, install new rings. Considering the age of the bike, a new cam chain would not be a bad idea as well. Another possibility is a lean fuel/air mixture; If the bike has an idle speed that you can not get to slow down then there is an air leak letting un-carbureted air into the mix. Cracked rubber seals or bad gasket on the intake manifold would be the likely source. tombones49_50.gif

Apr 03, 2011 | 1993 Honda CB 250 Nighthawk

1 Answer

How do i get it out to put new one in

find the offending carb or carbs by pulling float bowl over flow hoses to the side and starting motor, 1 or move hose will be pouring fuel, follow hose to offending carb, unmount all 4 carbs from motor,(unmount tank,1 bolt 2 hoses,2 wires) then (unscew hose clamps from front and back of carbs) next(reomove scew from very top font of air box,near metal cross bar behind fuel tank) then wiggle carbs to separate from rubber intakes,unhook trhottle cables pull carbs out one side(either side of bike) once off turn upside down,take 4 bowl screws out ,remove cover,take out small pin holding floats ,needle will come with it,use the right wrench and uscrew brass seat needle came out of(make sure any rubber o ring come with) reinstall seat &any orings take old needle off float install new one,put needle in hole of seat,pin float put cover back on bottom of carb,re assemble bike.I hope you've maked where everything goes,a little oilon rubber helps with reassembly .


Jul 17, 2010 | 1981 Suzuki GS 750 L

1 Answer

My gs500f is back firing through the CARB. the carbs where removed and cleaned they where in good codition.when the suzuki mechanic reassembled the bike and started it the bike dosent want to adjust down...

Lean mixtures burn very slowly, at times slowly enough to continue burning through the power and exhaust stroke, causing a backfire when the intake valve opens, and that flame gets a shot at the new mixture charge.

In normal operation, as the engine slows, the fuel delivery from the main circuit falls off, and the idle circuit is supposed to take over. If the idle circuit flows insufficiently, that becomes a transition to fuel starvation.

You can try pointing an unlit propane torch into the inlet air, and see if you can get closer to an idle while supplying a supplementary fuel source. You will need to do this in a way that gets propane to both carburetor inlets, maybe rigging a Y with vacuum hoses and electrical tape...

This started with work on the carburetors, so the fuel system would be the most suspect. That, and the fact that it will run at higher RPM would seem to rule out fuel delivery.

I was looking around at photos while developing this answer (needed to know whether this was a twin or a 4-cylinder), and one resource said the idle speed should be 1,200. I don't know if that's right, but maybe 1,000 RPM is too slow for this motor to keep it together. (I do doubt that, though.)

When I wrote that last sentence, I started to second guess myself, thinking "What if the fuel shutoff(s) is/are vacuum operated, and as the bike approaches idle there is insufficient vacuum to hold it/them open?" But the I rejected that, because there is even less vacuum at cranking speeds, yet the bike starts.

Jun 26, 2010 | 2005 Suzuki GS 500 F

1 Answer

Cannot get my bike to start

Remove rubber connection from carby inlet (between carby and air filter) enough to get a piece of thin card to cover inlet to carby. Turn motor over with throttle half open for a few seconds. Remove card and see if any fuel is on the card. If there is, repeat process (fresh card) without throttle, fuel should still appear. If there is no fuel present, you have a fuel blockage. If engine still not starting with fuel present, you have an electrical problem, check for spark by resting attached plug to engine metal and turning engine over.

Apr 19, 2010 | 2001 Suzuki DR-Z 400 SE

1 Answer

Eng stays reved up when coming to a stop

you have sticky carbs or an air leak on the inlet manefoulds take the bike right back and have words with the guy who "fixed it!" like jently grad him round the neck and bang his head onto a wall till he gets it right this time you payed good money for the fix,, go back and get it done right

Jan 18, 2010 | 2007 Yamaha V Star Classic

2 Answers

When i accelerate my gear shift bobs up and down. I dont know what the problem is. can some one help me. my car is an 89 camaro rs v6 2.8 with a manual trans.

some movement is normal as you accelerate hard,But if it is alot you need to check motor mounts and transmission mounts for movement.
lift the hood and have a friend put the E brake on,put in first and let the clutch out slowly while giving it gas to check the left motor mount out,notice how high the motor lifts,then do the same thing in reverse,that will check the right side mount if they look the same you will have to have the transmission mount check on a hoist.

Dec 19, 2009 | Chevrolet Camaro Cars & Trucks

2 Answers

Wr250f 2001.riding bike reved and stopped wont kik properly

if this is a two stroke,then if you have run it out of fuel,there is no lubrication for the piston and you may have damaged the piston or piston rings,check the compression,esay test is remove sprk plug pit your finger hard into the hole and crank the bike over,if your finger gets pushed off with loud crack sound then compression should be ok,but if it doesnt and the preesure is very weak then you will be looking at a top end rebuild,hope this helps

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1 Answer

1991 CR 500 (reving to high on idle high serges)

take some wd 40 & spray around the carb boot while running to see if the idle drops for a few seconds. sounds like you have an intake side air leak causing a lean condition making the motor rev high.

Feb 16, 2009 | 2001 Honda CR 500 R

1 Answer

My bike does not work when it's cold

hi,,is the fuel consumption hi,,as in its usin quite a lot,,to me it sounds like u have a air leak ,,either your air box is not seated on the carbs properly and loose,, or it has been known 4 one of the inlet air caps to be missing u will find them ,between the carb and the cylinder head,,the inlet rubber that connects them, u will see a rubber cap,if u can see a brass looking air pipe then the caps missin,,and that will **** air in and splutter ,,even if theres a hair line crack in the rubber that will **** air to,,

Dec 12, 2008 | 2002 Yamaha XJ 600 Diversion S-N

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