Question about Yamaha Road Star Silverado Motorcycles
If they replaced the jets, did they replace them with the correct size? First off, the metering jets do not wear. Ethanol does not wear jets. If they replaced them, they replaced them to change the mixture. I would have them replace the jets with the original jets. Now, if something is going to wear, it the "needle jet" which isn't really a metering jet. It's the jet that the needle slides in when the slide in the carb goes up and down. It will wear due to the rubbing of the needle against the inside of the jet towards the engine side of the jet. Again, someone it telling you a story. Ethanol will not wear a brass jet. They changed the jet to change the fuel air mixture and now it's not right.
To find out which way it's wrong, try taking the air filter out of the air box and ride the bike at the speeds you have the problem. If the problem gets worse, you are jetted too lean. If he problem gets less severe, you're jetted too rich. By removing the air filter, you're allowing more air to get into the carb leaning the mixture. Now, since at this speed you are not a Wide Open Throttle, you're still running on the needle in the mid-range of the RPM range. You can lean the mixture by lowering the needle and richen the mixture by raising the needle.
What you need to do is take the bike to someone with an Exhaust Gas Analyzer and a Dyno. They should be able to put the load on the bike exactly like it's on the road and check your fuel air mixture at any given RPM. This will tell them if you're too rich or too lean and the RPM range will tell them which jet to change or the needle position to change.
Ethanol does not wear brass jets. The shop screwed up the mixture on your bike, that plain and simple.
Posted on Aug 25, 2010
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Posted on Jan 02, 2017
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