Ohendo
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I adjusted the exhaust valves a couple of weeks ago, 5 of 8 were OOS tight, others were close. After adjustment, lash was middle of the spec. link to forum post (#87) --> Valve adjustment
Rode through a tank of fuel, calculated thirty something MPG's. Couldn't be right, I thought. Performed a throttle body sync, was way off, link to forum post (#183)---> Throttle Body Sync Pics.
Filled up the tank again. Just finished that tank, low MPG again. Exact calculations were 37.5 MPG (I used to get 47.5 consistently).
Bike is running rich, can smell it in exhaust at idle. No other symptoms that I know of. No misses, back fires, sooty exhaust, loss of power, etc. I pulled the spark plugs last night to take a look, pic below. Seem to confirm rich condition.
Also have a link to 30 seconds of idling if that's worth anything. Almost seems like the cam chain is noisy but not sure if it's always been this way.
- checked TPS, steady values throughout throttle range (17-102).
- tire pressure is 36psi cold front and back.
- no brake drag, can spin front tire 3-4 revolutions, rear spins freely as well (as much as it can with chain on sprocket)
- lifted tank, all seems right with the airbox; all hoses connected, clean filter.
- I have an S1, so no O2 sensor
Could improperly adjusted exhaust valves cause a rich condition and poor mileage? Any other ideas on the cause? I may crack it open again and double check the clearances, even though I triple checked after adjusting. Argh.
Idling video: --------> https://photos.app.goo.gl/Bm3jWGpexTZswy479
photos.app.goo.gl
Rode through a tank of fuel, calculated thirty something MPG's. Couldn't be right, I thought. Performed a throttle body sync, was way off, link to forum post (#183)---> Throttle Body Sync Pics.
Filled up the tank again. Just finished that tank, low MPG again. Exact calculations were 37.5 MPG (I used to get 47.5 consistently).
Bike is running rich, can smell it in exhaust at idle. No other symptoms that I know of. No misses, back fires, sooty exhaust, loss of power, etc. I pulled the spark plugs last night to take a look, pic below. Seem to confirm rich condition.
Also have a link to 30 seconds of idling if that's worth anything. Almost seems like the cam chain is noisy but not sure if it's always been this way.
- checked TPS, steady values throughout throttle range (17-102).
- tire pressure is 36psi cold front and back.
- no brake drag, can spin front tire 3-4 revolutions, rear spins freely as well (as much as it can with chain on sprocket)
- lifted tank, all seems right with the airbox; all hoses connected, clean filter.
- I have an S1, so no O2 sensor
Could improperly adjusted exhaust valves cause a rich condition and poor mileage? Any other ideas on the cause? I may crack it open again and double check the clearances, even though I triple checked after adjusting. Argh.
Idling video: --------> https://photos.app.goo.gl/Bm3jWGpexTZswy479
New item by Brian Hendrickson
