Question about 1978 Yamaha XS 650 E

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I have a 78 yamaha xs650 bobber on a rigid and although it runs great the carbs sometimes dislodge themselves. The way they're attached from the factory with only a rubber boot and hoseclamp obviously wasn't intended for the vibrations created by a hardtail. Any suggestions or aftermarket fixes I don't know about?

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It is not that the carburetors were designed to hang from the intake manifold boots. There were supported and held in place by the air box . Sandwiched between the air box and intake manifolds . You could probably design a hanger that would drop down and go between the carburetors and grab the intake side with hose clamps or pull ties to support the weight.

Posted on Nov 11, 2010

Testimonial: "It's been so long since I chopped it I forgot about the supporting airbox. Thanks for the reminder and the tip."

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What do people mean rejetting? rejetting what ur carb?


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Please see the attached link for your use.

http://www.spark-plugs.co.uk/pages/technical/diagnosis.htm

If you do need to replace the jets you'll need to remove the carb(s) and tear in to them abit; the jets themselves just screw in and out. Take care when handling, their brass and can be damaged easily.

I hope this may have assited you,
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I had the same bike.there is a rubber line that connects the two carbs together.the carb with the lighter lean sparkplug is the one being feed by the other carb with the darker richer sparkplug with the fuel line connected to it i bet.

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1 Answer

I ran one of my carbs too rich and blew the left piston.


Hi fixx it
With the XS650, if you blew a hole in a piston, it has been  detonating on that cylinder, probably too lean more than anything. 
 There are some great forums out there that you can get access to with lots of information about the XS650. I own one myself, and have used this forums to rebuild my bike. 
for parts check out Mikes XS
for great advice on any dramas you are having
  650 Garage
or
  650 rider.
 The motors are easy to get out of the frame. One man can lift the engine, though I would recommend having someone hold the bike for you whilst getting it out.  I do have a link for a workshop manual somewhere, will get back to you shortly with that also.
happy to talk to you more about your classic bike. I love XS650's and ride one every day:)
regards robotek

Jan 04, 2009 | 1979 Yamaha XS 650 SF

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