Don87
Elite Member
I have an idea if someone wants to test it. Cover the vent holes on your hood. I think the air is coming in there and causing the tach problems.
I was just out using mine, and it acted up. I removed the cable from the head, sprayed liberal amounts of 'Yamaha Chain Lube' on it again, and it's fine now. I can't test the theory because of this. But on the new 1700 series, they have eleminated the vent holes on the hood. I think that's 'the fix'.
UPDATE: After typing the above post, I went back outside and within 3 minutes mine was squealing again. I grabbed the Scotch tape and covered the vent holes in the hood, and after another 30 minutes of running at WOT, I got no more squealing.
More testing of this theory needs to be done, but if you look at the design of the screen assembly under the hood, you will see that it directs the air directly onto the tach assembly.
I was just out using mine, and it acted up. I removed the cable from the head, sprayed liberal amounts of 'Yamaha Chain Lube' on it again, and it's fine now. I can't test the theory because of this. But on the new 1700 series, they have eleminated the vent holes on the hood. I think that's 'the fix'.
UPDATE: After typing the above post, I went back outside and within 3 minutes mine was squealing again. I grabbed the Scotch tape and covered the vent holes in the hood, and after another 30 minutes of running at WOT, I got no more squealing.
More testing of this theory needs to be done, but if you look at the design of the screen assembly under the hood, you will see that it directs the air directly onto the tach assembly.
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