Question about 1976 Honda CB 100

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There is no spark when i kick it over. I run it a little hard sometime. What should I check? I'm new to dirt bikes.

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CHECK your coil ,wire and plug

Posted on Nov 16, 2009

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1 Answer

Can't start my yz250fp dirt bike


Have a trained tech service and properly jet the carb and set idle and idle mixture.
If you have spark, compression, and the valves are adjusted properly the only thing left is the carb. The FCR carb is as complex as the entire engine!

Apr 04, 2014 | 2003 Yamaha YZ 250 F

1 Answer

1997 rm 125 won't start why should I do?


For your dirt bike to run you need 3 things:

1. Fuel (gas/air)
2. Compression
3. Spark

Start trouble shooting through these. Make sure your gas is turned on, and that it flows through the carb; if you tilt the bike does fuel run through the overflow tube in the carb? Make sure you have good spark; take out the spark plug from the cylinder, still connected to the ignition wire touch the threaded end to somewhere metal on the engine and turn the bike over. You should see a spark. Finally, do you have good compression, how hard is it to kick over etc.

These are the first things to trouble shoot, I would look on youtube if you don't know what you're doing, there are plenty of helpful videos there. You can also try putting a thimble full of fuel into the cylinder and then kick it over to help it start if it has been sitting a while.

Dec 09, 2012 | Motorcycles

1 Answer

How d yu start a yamaha yzf 450 an hw do you use the pressure release


push the kick start through until you get to a hard spot(TDC) then hold the decompresser and kick it just a little more to get it past top dead centre. release the lever
then one good kick, do not touch the throttle, even hold the bar not the grip so your not tempted to give it a squirt.


If it also has the hot start lever, or button this is for when the bike is quite hot and it leans out the mixture for starting, activate the lever and start the bike, then release the lever. This also helps if youve had a little lie down and the bike is flooded

what also helps starting is
new spark plug
clean air filter
new oil
check valve clearances
a small squirt of upper cylnder lube in the tank

Apr 01, 2011 | 2005 Yamaha WR 450 F

1 Answer

A fterI warm up my 01 rm 250 my bike don't start


Possibly the choke is getting stuck internally, Even thoug the leaver may be in the closed (normal) position, it may be sticking internally. Try removing the choke and cleaning the passage with some carb cleaner, then replace the lever. The bike could run with a partially cloged choke but would be tough to start when warm due to too much fuel. Another thing to check, when it is hard to start, just after kicking it over a few times, remove the spark plug and see if it is wet with gas. My guess is that's it's soaked. Good luck.

Apr 04, 2010 | 2003 Suzuki RM 250

1 Answer

Purchased a Yamaha 2003 TTR 225 on Saturday and it ran perfectly. Sunday it started up & cut off and we have not been able to get it started since. We know very little about dirt bikes except the...


Check the spark plug to see if is sparking. Hold the metal threads against the metal cylinder and have a friend kick the engine over. If no spark, use an ohmmeter to check the kill switch on the bars and also the side-stand kill switch if your bike has one. Check the wires for a loose connection or disconnected wire.

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  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • the throttle, used to prime the cylinder, (power valve).
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm, (Power valve), in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), for six kicks. After six kicks go ahead and twist the throttle again for a second priming. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting. Note that not all carbs have a power valve. When a power valve is not present you should crack the throttle open only 1/8 inch from closed on each kick. Please take a moment and rate my answer. Thanks!


Dec 21, 2009 | 2003 Yamaha TT-R 225

2 Answers

Yz450f that quit running


Yes, it does have an automatic decompression mechanism. It is a centrifugally operated mechanism and it is EXTREMELY unlikely that is causing your problems.
The two highest probabilities are:
1. Fouled spark plug. Forget what it looks like, put a BRAND NEW plug in. It is the cheapest form of diagnosis you can do. These bikes are terrible about fouling spark plugs and a fouled plug produces the exact symptoms you described.
2. Inspect your valve clearance. Tight valves will also make the bike hard/impossible to start with the kick starter. In some cases, it can be push started, but still won't kick. With tight valves, the bike, although hard starting, will run pretty good, for awhile. Eventually it will burn the valves and quit running though.
If your bike isn't kick starting fairly easily, something is wrong and needs to be addressed. The only other issue is making sure the idle speed is set per the service manual. These bikes have a fairly high idle, some as high as 1700 rpms. If it is set too low, it makes them hard to start too.

Sep 11, 2009 | 2004 Yamaha YZ 450 F

1 Answer

Basicaly brand new cr25o mx bike wont start


Assuming you are using fresh gas. Check to see if gas is coming out of the line, if not blow back up into the tank and if that works there's dirt in the tank. Check the spark by removing the plug and kicking it over with the plug touching the engine, look for spark. If no spark, try a new plug, if still no spark, you have a stator problem. It wouldn't hurt to clean the air filter in any case. Good luck!

Jun 12, 2009 | 2005 Honda CR 125 R

1 Answer

Hard to start yz250 dirt bike 2001 4stroke


i used to own a yz426f and it had the exact problem... a fresh plug will fix your problem. change the plug and the bike will run great. also don't start the bike and shut it off , my bike would be fine if i started it and rode for a while getting to the proper heat range help save the plug. if my bike didn't start in one or two kicks it was usually the plug.



hope this helps

Mar 10, 2009 | 2003 Yamaha YZ 250 F

1 Answer

Starting problem my ct100 bajaj bike


You need to do a few things to make it start.
  1. Replace the spark plug
  2. Set the intake valve clearance at .002"
  3. Set the exhaust valve at .003"
  4. Tighten the cam chain
  5. Make sure the carburetor is clean, meaning all jets are clear. You may need to remove the float bowl to make sure there is no varnish or dirt in bowl.
  6. Your problem is most likely tight valves. The bike gets very hard to start and runs like **** when it does start.
  7. When you go to kick start it check to make sure you have compression, tight valves make you lose the compression and it kicks right through when you attempt to start the bike.

Dec 04, 2008 | 2007 Bajaj CT 100

3 Answers

03 YZ not starting


I don't think this is a float issue. One way to check is to turn the gas off, take the bowl off the carb, hold the float up, and turn the gas back in. If fuel flows, the float needle is toast. It sounds suspiciosly like a worn topend, but it could also be a clogged jet ot fuel filter, or a faulty CDI.

Nov 10, 2008 | 2003 Yamaha YZ 125

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