Top 20 2008 Honda CRF 450 R Questions & Answers

check out put of generater , coil etc ! P...

could be more than likely water pump seals.

Is the air filter clean or no air leaks in the manifolds intake or the jets or carby haven't been damage when cleaning it or is there fuel flowing into the carby maybe fuel filter can on try

Answer one.

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

check the clearance between the rear tire and inner rear fender, maybe stuff a shorter shock in there. also look into a different seat, maybe one with a thinner thickness

I've got to beleive at minimum you're looking at a top-end. That would include valves/piston/ring and associated machine work. The grey/white oil indicates coolant coming into the cylinder head and mixing with your oil. Not a good sign. Hate to be the bearer of bad news but it looks like a pretty involved repair.

John

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..........

The coil may not be the problem on your bike you may have a bad ignitor it is module on the the bike usually located under the gas tank or near the battery.

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