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Post by hopwheels on Jun 24, 2006 21:42:55 GMT -5
Well guys... all the little nit picky things are done on my '79. Break fluid in and bled, chain on, last little bit of wiring done... gassed 'er up today AND nada. No start. I kind of figured it might not after sitting for a couple of months. I'm using the Bat Pac battery eliminator, any prolem with that being left wired onto the bike? So what should I check first? Thanks for the help guys.
Gary
Hopwheels
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RD
Full Member
Posts: 176
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Post by RD on Jun 25, 2006 4:30:12 GMT -5
Hi Gary
I just went through this and the first thing you need to check is the spark and does it have one, if not and you know someone with some spares you need to try swapping the obvious things like the plug, coil, CDI and if you have access to a multimeter you can check the resistance on the stator.
I went through all this stuff with no joy and then fitted the new wiring harness I picked up on ebay and now it starts first or second kick most of the time, just lucky I guess.
anyway best of luck and report back soon, it's an exciting moment when it fires.
cheers
Rich
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Post by StewRoss on Jun 25, 2006 4:53:06 GMT -5
Hi Gary,
SPARK:
I agree with checking the spark first, then see what else comes along. Plug is a BP7ES...or an 8 if required.
If there is no spark, check the wiring first...you would probably have had all of that off the bike...check the connections from the bottom end up, including the spark plug cap.
The SR doesn't require a battery to run so the eliminator is of no real consequence. Again, make sure of the connections are secure.
Are the cam and ignition timings OK and in their correct spot, timing marks lined up etc...you would have done this as you assembled the engine.
FUEL:
Fuel is the next thing, is there fuel getting to the needle and seat in the carby...remember also that the standard SR has a vacuum tap. If the vacuum isn't hooked up to the back of the tap it will only flow on 'Prime'...if you're happy with this then all is OK.
However changing the carby means that you either have to place a separate vacuum connection in the inlet manifold...I believe that you can get XS650 manifolds with this already in-situ...or you can insert one into the carby outlet...means some machining of a spigot and drilling and tapping.
Other things such as CDI unit failure etc. are also to be considered, however, don't assume the worst straight off. Look for the easy fix...
Hope this helps.
SR
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Post by canucksr on Jun 25, 2006 9:44:51 GMT -5
If the Bat-pac isn't connected correctly you may have fried the stator. Yamaha warns against running without a battery or a suitable alternative.
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Post by hopwheels on Jun 25, 2006 10:15:25 GMT -5
Thanks for all the ideas guys.
The Bat Pac is installed as per the instructions. Hope I didn't fry the stator... that would suuuuck.
I'll check the wiring over. I hope the timing was set up properly by the mechanic that built the motor, I'll save that for last to check into. I have a couple of new coils to swap out and plugs. Beyond that (CDI, reg, stator), I'd be off the eBay.
I have changed the spigot/tap to a non-vacuum type (a new part from MikesXS), that has on off and reserve. Fuel went into the inline filter on both "on" and "Reserve" positions, when I cracked the throttle a little. Not sure if this means all is ok, just reporting the facts.
I'll report more as I find more. Thanks a lot guys!
Gary
Hopwheels
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