20 Most Recent 2005 Honda CRF 450 R - Page 7 Questions & Answers

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

Hi ...... Any preload and/or damping will be adjustable from the top of the forks (even upside down forks). Anti-clockwise to reduce, clockwise to increase. You may find that a previous owner has increased the 'weight' of fork oil as a cheap/easy alternative to adjustment or aftermarket linear or progressive springs.

Hi and welcome to FixYa,

Initially, backfiring is a spark/timing issue or contaminated fuel (water) or as you stated stale fuel. AVGas would not result to backfiring but rather a stronger pull though would heat up easily.

Good luck and Thank you for using FixYa. Happy Holidays.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

Hi there

You should not have oil leaking from the carby. If you have over filled it with oil, then it may be coming from the crankcase breather and then into the airbox, and appearing to come from the carby. If you have not over filled it, then the bike may have blowby problems with compression gasses passing the rings, and in a similar manner forcing oil out the crankcase breather. Not sure about the hole in the side of the cylinder... do you have a picture? Unless its pouring out, or gets worse, I would not be too worried. If you have over filled the oil, maybe time for an oil change to get the level right.

regards
robotek

On Thumpertalk, according to 4 different owners of stock to slightly modified CRF450s they all posted mid to upper 80s for a top speed.

Damage to the spark plug is surely related and caused by a more specific problem , if you could repost a new question with a bit more details on your Honda is running what fuel or mixture your using and exactly which spark plug you are using, or better a photo or video of this burned up plug we could help more. Would you say you are experiencing any of these scenarios https://e3sparkplugs.com/blog/are-your-spark-plugs-trying-to-tell-you-something/ https://www.6ya.com/jacobsmith

Fifty something I'm nearly sure...

Check if water pump shaft isn't bent

Check cylinder compression

Yes, you can do this, but this won't resolve the stretching problem.Actually the tread is gone in the alumni cylinder, you can try a longer bolt, if you have enough room for this. You can buy a tread repair insert and fix the tread.

HEAD GASKET

have you checked the kill switch? It may be stuck activated.

Here are images from the service manual. There is more to the installation ; cam mount torque and valve timing for example. My email is [email protected]. Email me and I will try to email back with a PDF attachment of the head installation chapter from the factory service manual.

Have you tried another spark plug. It is easy to wet foul a new plug with ethanol fuel. New spark plugs need to be driven a few miles before there is a enough exhaust carbon to seal the crack between the metal body and the insulator. It is also possible that the resister in your spark plug cap has burned out causing a weak spark or no spark at idle.The spark plug cap is part #2 on the following diagram. http://www.bikebandit.com/houseofmotorcycles/2009-honda-crf450r/o/m18024#sch583897 The OEM spark plug cap is $35 but you may be able to use an NGK replacement for around $5.The spark plug cap simply unscrews off of the end of the wire and should read 5000 OHM's on a voltage meter. If the reading is higher or lower replace the cap.

No, it's not necessary.

Some water pumps are considered replacement items and are no repairable. Check with the agent to see if there are spares available, if not, you will have to buy a new water pump. If the water pump is repairable (you did not mention your bike make or model), here is a photo guide to what to expect:- http://www.classicwingclub.org/gallery/finn/rebuild.htm

Hi, your water pump drive shaft has warn a groove where the water pump oil seal sits, so you need a new water pump shaft gaskets and seals. Maybe new shaft bearings $100-180 to get it fixed. The water neck from the cylinder head needs a new o'ring..........

May I ask what you need to have changed so I can help you more. Also Year, Mak, Model will help a lot.