20 Most Recent 2006 Yamaha yZ 450 F Questions & Answers

I would reccomend replacing both water pump shaft bearings and also the shaft if there is any sign of grooving on the shaft. Without looking at a diagram i am assuming that the water side of this bikes pump is a mechanical(ceramic) seal design . Sucessful replacement of these mechanical seals can be tricky. A few tips are: be certain that all case surface areas are clean with all old seal/sealing debris removed such as with sccotch brite. So that the seal will seat and seal properly in the case. NEVER allow your dirty/oily fingertips to touch either of the ceramic pieces of the seal in the contact area. Lubricate these ceramic pieces with a standard green type of coolant only upon assembly. Always use a regular green type of coolant in the system untill you are confident of the install and then change to another type if you are going to. Be aware that it is not uncommon for the mechanical(ceramic) type of seal to weep slightly during initial break in as the two halves seat to each other. This weepage should dissappear in a short period of running time.

It is hard to say what's wrong Jeff. You took it in in running condition, the shop should return it in running condition, ESPECIALLY if you took it to a Yamaha shop. Don't let them hand it back and say " we can't find the problem ". If they truly can't find it, the District office for Yamaha USA should be notified. They don't like it when a dealer doesn't have competent mechanics. Worst case is you take it to a different dealer. Chances are there is either a short in a wire or the pulse coil is shot.

Question edited for clarity and add maker. Question moved to model category. You may find the casting broken inside the crankcase, but as there is a 'Kick Start Kit' for this bike, it makes me think that they know there is a problem with it. https://www.google.com/search?q=2008+yamaha+yz450f+kickstart+kit ..

Even when I run my bike pipe is so hot cant ride safely as I have to lift my leg out of the way bc pipe is burning hot. Without touching it already have burn scars on my leg.

The wiring diagram is a map showing you what wires are on that particular bike where they go what colour they are and what they take power to and from where. They are usualy in the book supplied with the bike or can be got in service manuals or maby on the net.