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Sounds like possibly a problem in the low speed circuit of the carbs. The slow speed jets/passages are blocked and won't meter fuel properly & the idle speed screws are turned in so far,to get the engine to run, that the engine is actually running on the main circuit, that makes fuel delivery & idle...
There are also the primary chain and the oil filter drive chain to consider as possible sources of noise. The primary chain has a spring-loaded roller against the bottom run, the top run will actually go a little bit slack, on the overrun(compression). The oil filter chain doesn't have any tensionin...
Did you put a wire through the jets or just blow them out? Varnish can build up in the hole, you see thru it fine and squirt carb cleaner thru the hole but the jet will still be undersized. I like to use a copper strand pulled from a piece of automotive wire. Poke the wire thru the jet and hold both...
I have a whole box of D10HS because they are stock for the 160. quote] I worked at the Honda dealer back in the day when 160s were new and in spite of one may read, off the internet, D10HS plugs do not work in a 160 Honda. The coldest plugs we ever used were D8s, some customers actually got better ...
Lean running is a valid concern these days, with ethanol being blended into today's gas. 10 percent more main jet area is a good place to start. You might try raising the needles in the slides one notch, in the meantime, that will richen the mid-range a bit and will affect (slightly)full throttle al...
The petcock in the picture hasn't been altered, the raised material, in two places, is plenty to keep the disc located. A smooth flat surface on the back of the handle is necessary for the petcock to work without leaks. Re-surface it with a sheet of wet/dry 1500 grit sandpaper on a piece of plate gl...
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