Question about 2005 Honda CRF 450 R

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Spark plug replacement

How do I change the spark plug in my 2005 CRF 450R ? do I have to take it all apart of is there an easy way

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You will have to remove the fuel tank to get to the spark plug. Not that bad of a job...2 seat bolts,tank strap and the radiator shroud bolts and fuel petcock. Thats it! good luck!

Posted on Jan 15, 2009

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1 Answer

Hard starting


You need to inspect the valve clearances. It is common for the intake valves to wear a little.
Inspection of the clearances should take place at 15 hour intervals if you are racing the bike.

When the valves leak, the bike does not maintain compression and kick starting becomes tough. The fact that the bike starts when being bumped, shows a loss of compression.

An easy DIY compression test is to remove the spark plug, place a finger over the plug hole and press down on the kick start lever. The air should be forced past your finger at a high rate and you should hear the air escapeing. You must not be able to prevent any air from escaping.

Good luck


Mar 07, 2009 | 2002 Honda CRF 450 R

1 Answer

I am trying to replace the spark plug on my 2005 CRF 450 R has been sitting for about 1 yr without running and I am sure it needs to be replaced....Is there an easy way to do it or do I need to pull...

Hi jjb
To give you all you need to do change the plug, and swervide the bike, you can download a service manual for free from here. If the the bike has been sitting for a year, to look after the engine BEFORE you start it, you should do a few other things also. A quick list 
  1. The engine oil will need to be changed, 
  2. clean and check your air filter
  3. Drain any stale fuel from the tank and carb, refresh it, prime the carb
  4. Remove the plug, and put a dribble of 2 stroke oil into the chamber
  5. Crank the engine over a few times with the plug out.
  6. Fit the new plug
  7. Start it up, it may smoke a little initially, but this is ok. 
 Before you go for a ride, good idea to go through the manual and do all the service requirements. Thanks for using FixYa. 
regards robotek

Jan 10, 2009 | 2005 Honda CRF 450 R

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