Engine tachometer reading funny. - Yamaha Raptor Forum
 
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post #1 of 2 (permalink) Old 05-01-2019, 07:02 PM Thread Starter
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Question Engine tachometer reading funny.

So I installed the Yamaha tachometer a while back and finally had a chance to hopefully solve this issue tonight....not so much.

https://www.shopyamaha.com/product/d...umber=&ri=true


It's reading about half of what the true engine RPM's are. I hooked up the powercommander to my laptop to confirm this. I originally had it wrapped around the coil 5-6 times.

I changed it to wrapping around the spark plug wire 5-6 times this evening. But it's still giving half the RPM reading.

There isnt a ground cable with this unit either.

Any thoughts
Jason Shaw is offline  
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post #2 of 2 (permalink) Old 05-02-2019, 12:45 AM
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Location: San Diego, CA
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Quote:
Originally Posted by Jason Shaw View Post
So I installed the Yamaha tachometer a while back and finally had a chance to hopefully solve this issue tonight....not so much.

https://www.shopyamaha.com/product/d...umber=&ri=true


It's reading about half of what the true engine RPM's are. I hooked up the powercommander to my laptop to confirm this. I originally had it wrapped around the coil 5-6 times.

I changed it to wrapping around the spark plug wire 5-6 times this evening. But it's still giving half the RPM reading.

There isnt a ground cable with this unit either.

Any thoughts[IMG class=inlineimg]https://www.raptorforum.com/forums/images/smilies/huh.gif[/IMG]
Does the directions mention how to chane pulse per revolution (PPR)? I use a works connection tach/hr meter on my bikes and they are cheaper than that Yamaha one.
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