Question about Motorcycles
I have a in-line 4 cylinder 1999 Yamaha YZF600r Thundercat. The outer cylinders are running too lean and the inner two cylinders are running very rich. Tried raising and lowering the floats, switching around the ignition coils, cleaned out the carbs, and sycronised them, adjusted the timing, but the same problem reoccurs. Any ideas please? appreciate it.
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Posted on Jan 02, 2017
Are you saying that 2 & 4 got gas with external tank but not with gas tank? If so something else has happened ,if gas is getting to the carb it cannot by-pass 2 to get to 1. Take the tank back off ,connect to external, again. See what happens.
Posted on Sep 11, 2009
check all earthing connections on the ignition system and in fact on the whole cycle. A loose or dirty connection may be the cause.
Posted on Sep 17, 2009
SOURCE: My 1974 yamaha dt175 seems
The 175 is a two stroke and if gas were getting past the piston it would collect in the crank chamber which is sealed from the gearbox and gear oil. If the gearbox oil is a white-ish color the problem is water emulsifed in the oil.
As far a the cutting out, many things could cause it. The points need filed and set or replaced, the carb and filter need cleaning, bad crank bearings (usually the crank seals are bad also), condensor or coil is going bad. I have listed the items in probable secquence Hold the flywheel firmly in both hands and then lift up and down, left and right. If it is not ROCK SOLID the crank bearings need replaced. Any other questions just post a reply. By the way, you can still get many of the parts to your bike at Babbitt's. Go to the website below to see an exploded diagram of the engine and other parts of the bike. Let me know what you find out.
Posted on Aug 15, 2010
Testimonial: "Thanks Tom. "
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