Question about 2008 Motorhispania MH-7 Naked

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Not starting its started to over het so i fix that but crack a pice on the piston will it need a new one as there is still compression in the head and it wants to start but wont help me plzzzzzzzzzzzzzzzzzzzzzz

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  • craneyboc Jan 03, 2009

    yes the compression is same and it was over heating because the gasget was gone so water was going in to the head

  • nickels428 May 11, 2010

    Is the compression the same as before the problem?  How did you fix the over heating problem?  what caused it to over heat in the first place?  

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Piston weight is critical to how the engine works &runs that peice thats missing helps hold the piston square in the cylnder bore the broken piston needs to be replaced

Posted on Jan 04, 2009

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1 Answer

If my kx 125 has no compression when I try to kick start it but it does have fire what do I need to do


If no compression, then assuming the piston is moving up and down the pressure is either passing back past the piston (could be the rings or a hole in the piston) or escaping through the head (head gasket, spark plug hole, hole in head). First check the piston is in fact moving as it should. If it isn't moving you need to find out why (bottom end problem?). Can't see you getting away without stripping the engine to fix problem.

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Easy fix. Take the intake flexible pipe from the gas tank and drain out the fuel. .Then remove the carburetor bowl. Used compressed air to clean. Remove the spark plugs individually an blow compressed air back through the pistons. Add a starting accelerant to dry the heads. Add new gas with a clean up solution for the gas. start and run. Fare well.

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Low compression


have you checked the valve gap if the valves are open this will cause low compresion if not there may be a crack in the head or cylinder but not to clever with bikes sorry

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What has gone wrong?


No compression? You checked this how? With no compressin, this means there is no closure going on in the engine. You might have a broken valve (s); a hole in the piston; blown head gasket; or other problem; or a combination of problems. If there is NO compression, I would start by emoving the heads and having a look. It may not be economical to fix, rather, if this requires engine tear down, you might want to replace the engine or the entire machine.

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Have a crf250 lately it wont start from kick was told its something to do with the valves but the compression seems very low too can you help


Bad valves will cause low compression. When the bike was running, did it smoke constantly?, ( bad piston rings ), or did it only give a puff of smoke when started and when pulling away from a stop?, ( Bad valve guide seals ). Do a compression check. It should read around 150psi.. Chances are the valve faces are carboned up, pitted and or burned. The problem can likely be fixed by re-seating the valves ( AKA grinding the valves ). Removing the head is easy, re-seating the valves is easy, but putting it all back together and setting the valve timing and clearances is a bit tougher for the novice. Some special tools are needed. If the bike is smoking as described above, now would be a good time for a cylinder bore, new piston and rings and valve guide seals. Please rate this solution, thanks!

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2 Answers

Not starting


Hi there
  • Low compression, and lots of blow-by forcing oil into the air filter via the the crankcase breather. Sounds like you need a top end rebuild. If you can get your hands on a compression tester, then check it. If it comes in under 120, then certainly time for a tear down and top end rebuild.

  • If you put a quick squirt of oil down the spark plug hole and if the compression pressure goes up on a second compression test, then rings/piston/bore are worn. If it does not come back up, then it may be leaky valves, or a blown head gasket.

  • do the compression test first. That will tell you where to start. Or, if you have the tools, tear the top end down and inspect. A motor re conditioner/machine shop will help to measure up and tell you if piston, and bore are ok. May just need new rings to freshen up.

Happy to answer any questions that you may have.
regards robotek

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Just put new piston and rings in my 1993 liquied cooled polaris 350cc ATV and after starting, right away it starts to bubble back in to my overflow bottle. With in 3 min. it starts to overflow. checked to...


you may have a cracked cyl. head or warped head...a crack in the cyl. is rare but does happen.....have a quality engine or machine shop inspect them for you..

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1 Answer

Put new piston, head gasket in but when put back


check and see if your timing was set correct,is fuel getting to carb, did you hook up all electrical correctly,compression ok ?

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I was recently riding down and enduro trail when i laied my 2003 WR-250F over and when i attempeted to started it, i had little to no compression. When i inspected it i found a fouled spark plug, and so i...


Take out your spark plug, but plug it into the plug-wire. Let the bottom of it dangle against the head and try to kick it. If no spark, problem with that, if it sparks, you may have a cracked head or piston/rings problems. This will at least rule one thing out.

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1983-1985 Yamaha IT250K.
You need several things to get it to start: A clean carbuerator, a good reed cage, a good, clean spark plug, and compression.

Start by pulling the spark plug. If it's oily/dirty, replace it. Then kick the engine over, and you should get the motor to turn over really easy. Place the plug back into the hole, and the effort to turn the engine over should be hard, if there is compression. If there is no compression, you need to remove the cylinder head to find out why. It could be a hole in the piston, bad rings, or worse, bad crank seals. If the piston looks okay, then chances are the problem lies in the Mikuni carbuerator. It's an simple device, but you need to make sure the needle seals the bowl when the float level is correct. You also need to make sure your air enrichment circuits are free of dirt and varnish. Give it a good scrubbing. Once the carb is clean, and the float level is sound, make sure to check the air filter to ensure it is clean. The carb ensures fuel is correct. Lastly, there is spark. Your plug wire shouldn't have any cracks, and when you crank it over, there should be a spark from the plug. There is a remote chance that the pickup coil has burned out, but the ignition system on these old Yamahas is pretty reliable, so look there last of all.

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