I ran one of my carbs too rich and blew the left piston.
Is there anything out there that I can use as specific instructions on how to remove my 1979 XS6502f engine so I can get it repaired? I know I could probably purchase a shop manual, but perhaps, some other means is available. I need to do this myself to minimize the cost of getting it fixed. Thanks. Tim
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Re: I ran one of my carbs too rich and blew the left...
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
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:)
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This can vary from year to year, model to model, and make to make. A service manual for your specific bike may shed some light on what the default settings are on your carbs. Sometimes a simple search on your year make and model of bike with carb adjustments can return the answer to your question. Here is an example: 1979 Honda CB750 Carb Adjustments. One other factor in this is the elevation you are at. At higher elevations the air is thinner making your bike run rich as there isn't enough oxygen to mix with the fuel. Once you know where your adjustments are, you can get them fairly close by slowly adjusting them with the bike idling. You want to turn slowly (1/8 turn at a time) until you hear the motor idle increase. For multiple carbs, start with one and repeat on all other carbs. If you continue to turn your jets after the idle increases, it will eventually start idling down again. I have been taught to try to find the boundaries going each way and seek the middle ground. Once this is performed on all carbs, you may need to adjust your throttle stop adjustment screw to bring yoyr idle back to specification. Good luck with your carbs, safe and happy riding to you.
Yes it will run, but the 77 has different cams so the cam timing is different (more horsepower) The 79 is detuned and designed to burn leaner. In other words you may not see a performance gain and the mixture will probably too rich for the 79 (79 carbs are pollution controlled/which means harder to adjust yourself)
Sounds like your high speed jet is still stopped up. You didn't tell me what type of carb you have on the bike but what you've got to do is the same. You must remove the float bowl, remove the main jet, and clean it out. Also, clean the very bottom of the inside of the float bowl.
Flushing a carb will not clean the jets. The reason is that fuel must be able to flow though the jet in order for any chemical additive to clean it. If no fuel flows through, no cleaning action is taking place. That's why you must disassemble the carb and manually clean the small holes in the jets.
If you need more specific instructions, I need to know exactly what carb you've got on the engine. Good Luck, Steve
You will have to recheck the float level (in the float chamber) of those two carburators, reset if necessary.
You may also have to reset the air-mixture screw for both of those carbs. Standard procedure to set htem is tighten them all the way in making sure not to over tighten to avoid damaging the sharp end of the screw, and thn to open 2 and a half to 3 turns.
You can thn reset them as the engine is running + -- either way.
Hope this helps!
You may have an internal carb gasket leak or your floats may be adjusted too high.After you run the truck look into the carb to see if there is gas still dripping into the carb bore.Also after running with engine on remove the front fuel level check screw. (have lots of rags under to catch fuel) Fuel level should be right below hole.If it is spilling out it is too high.Floats need to be adjusted up for fuel level to go down.
If you have a compression gauge, check the compression. Anything under 90psi is too low.
Check your flywheel key. If it is broken the flywheel will move and not fire at the correct time.
Note: if it does not sputter with carb cleaner then it's not your carb.
Next: Remove your exhaust manifold. Look into the cylinder with a flash
light. You are looking for scratches. Anything larger then a light
fingernail is definite proof you need a new cylinder/piston assy.
If it passes that test do the following:
mixed fuel straight into your cylinder until 1/4 full. Slowly pull your
saw over while looking into the cylinder. If you see bubbles after the
ring/rings go by then you need a new cylinder/piston assy. On rare
occasions if no scratches are present on the cylinder wall or piston,
you may be able to change just the rings.