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I have a yamaha zx400 motorbike the problem im have is setting up the timing for the cams ....can anyone help please wayne

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  • Motorcycles Master
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Remove ignition cover , put piston next to cam chain at tdc and move cams round with chain over cogs till aligning marks on cogs line up with head face edge and replace cam retainers , some engines have small dots on cams that line up on the retainers which have a mark on so you can see them aligne too , if ok then fit chain tensioner and guide and rotate engine in direction of rotation with bike in gear and rotate rear wheel by hand to check if valves miss pistons etc ! all ok then refit all parts and run up P...

Posted on Dec 12, 2013

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Posted on Jan 02, 2017

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SOURCE: motorbike yamaha will not start

Didn't say much about what it does or doesn't do as trying to start. The batrtey all the way up? if not it can refuse to start even if cranking 2002 and newer may push start but only if the battery is near good 04 and newer are fuel injection and a low or bad battery is a no start on it's own the modern glass mat batteries don't take a jump very well as they resist being pushed back to full voltage even with a car battery. Cranks good with a good battery. Got gas and the valve on? Carb bikes may have to have the fuel pet on prime to start a (dry) motor. The fuel injection bikes have to have the good battery or the fuel pump can be below theasehold and the relay won't turn the pump on. All the lights and others horn ect working? No crank can be clutch switch kickstand switch if the locic box is burnt out or low voltage, Neutral light working? if not the kickstand has to be up for crank. Burn the strarter out cranking with low battery? Strong click when pushing the start button says the safty switches are working. and the starter could be bad or lost it's ground. Will the engin turn? put the bike in higher gear and push it with the clutch out to see if it will turn good compression may be hard to push but not impossible as the starter and you have about the same power, remember they used to have kickers and this one had one it'd work to start it. Carb bikes have drain bolts on the float bowels and little hses hooked to them if their still there open the screws to see that theres gas or something else in the corbs. and will more come from the tank? Spark the plug wires snap to the plugs and are hard to remove if good put a plug ( any good plug will do) and crank the engine to see the spark at the wire. if not kill switches crash swiches may have to be reset then the key on and off too. lfter that its lookto see whats missing as compression spark and fuel are all it needs to run. If it jumped time the compression won't be good or out rajous. Exhaust stopped up? I've seena mouse store corn in the exhaust and forget wher he packed it. seen a R6 completly full! no start air cleaner housings get filled the same way. these don't apply if the bike had been running recently. Bad or poor battery most likly cause of no start then cable connections

Posted on Aug 12, 2009

  • 3567 Answers

SOURCE: how do i set cam position and timing on an old yamaha xt 500

You didn't say WHY the cam / valve timing needs to be reset. For some reason I get the feeling someone told you that resetting was needed and so you are asking how. Obviously, you may have installed new pistons and that is why the resetting is needed. In either event, when the cam timing is set the valve timing is also set. Other than adjusting valve lash, setting the cam sets the valve timing. Below is a web site where you can do a free download of a factory service manual. The process is not hard but having a manual will be more help and faster help than I can give online.
http://www.carlsalter.com/motorcycle-manuals.asp

Posted on May 27, 2010

Testimonial: "Thanks for your reply. I've been to the web site before and downloaded the manual already. It does not really cover the situation I have. There also seems to be a lack of compression with the bike. A friend has lent me a workshop manual so I will try that in the mean time. Thanks again "

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