Another WR450 wont start after using a yz cam.. Please help...........
Posted June 22, 2006 - 04:12 PM
I have attached a pic and it may look like the exhaust cam mark is up a little from the head but that's the angle i took the pic at so the flash woulnd't reflect back, both marks are even with the top of the head when looking straight on to it. Also I count 13 pins between the top two marks, is this right? normal?
Posted June 22, 2006 - 04:40 PM
If your timing still looks correct, install your old cams and see if she wont fire. But first always do the flood starting routine to make sure its not flooded/fouled. good luck
Posted June 22, 2006 - 05:14 PM
A good way to verify if you are on the correct timing mark if to remove the plug and drop a long screwdriver down the hole so it's resting on top of the piston. Rotate the crank CCW until the screwdriver is at it's highest point (TDC). The mark you see on the crank in the window now is the correct timing mark. Remember, you have two TDCs per combustion cycle. You want the TDC of the compression stroke when all the valves are closed.
Posted June 22, 2006 - 06:07 PM
Posted June 22, 2006 - 06:36 PM
I have inquired about upgraded starters. I have on hand the larger YFZ starters and a left cover, but it will take some serious mods to get it to fit. I checked with several starter experts and they tell me that the Yamaha and Honda starters are the latest tech for their size, but they would need a thousand orders to develope a better replacement. I believe that less windings can result in higher starter RPM's, but I am no expert in this area.
The bottom line is that Yamaha designed the WR for a specific purpose and went to the trouble to minimize the starter weight. It is no accident that the cam timing comes the way it does.
Posted June 22, 2006 - 07:14 PM
Posted June 22, 2006 - 08:09 PM
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Posted June 24, 2006 - 06:23 PM
Ricks Motorcycle Enterprises in Boston (800) 521-0217
Larry at GOKI (818) 998-0852
Elwood at Stocker Starters (888) 786-2537
Larry thought it would be interesting to shoot 18 Volts to the starter, but that would require an additional 6V battery in series for the starter only and another rectifier to charge it, etc. Elwood said that he would love to improve the starter because of a lot of issues with them even in stock bikes, but it would take a thousand orders to make it worth while.
As I indicated earlier, perhaps less windings could help the speed at the expense of some starter power. Changes to the starter gearing would require major mods and size/weight restrictions point to a solution based on the original unit. Apparently, the OEM starter is state of the art using modern materials, so........
We could all benefit from a realistic solution, but I am out of my league at this point. Any "rocket scientists" out there that have thoughts about a realistic solution???
Posted June 24, 2006 - 08:04 PM
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