all my problems roled into 1 question?
yamaha xj600n
1998 R reg 35k miles
Problems inc:
backfiring right exhaust can
loss of power and 4th gear to overtake
throttal at fullest after 60mph
0-70 ok then flat
little groggy at starting, but second time with choke on and throttal is ok,
engine feels hotter than usual
it was bought second hand ( 5 owners) i have oil changed it 10/40 semi syn, sparkies, new chain etc.
Air filter is gonna be popped in next weekend but i guess this wont make all the issues go away. Carbs and valves?? who knows then they were done last, but i dont want to spend if i dont need to.
Any ideas why back firing right exhaust can and no power after 70mph. Power band has gone too. at 8k revs she use to take off, but not anymore.
no leaks or spills on floor after use, not smoking from exhaust either.
I did notice both exhausts at the can side have small needle holes under them and the right exhaust was blowing heavy from it, the left just from the can end
It could be something serious, but…
I’ve just looked at a picture of the carbs for your bike. It looks as though it may have CV carbs. These have a large rubber diaphragm under the top cover of the carb. The test for this would have zero cost (hurrah).
Remove the diaphrams from the left and right sides and swap them. If the problem swaps sides then you’ve found the source. If not, then it’s cost you an hour.
The diaphragms wear out over the years and get small holes that can be difficult to see. The good news is that they are v.easy to replace, and quite cheap.
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