New to me stratoliner help: sloppy idle and light throttle miss - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 33 (permalink) Old 03-24-2016, 12:39 AM Thread Starter
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New to me stratoliner help: sloppy idle and light throttle miss

Picked up a 2007 with 6200 miles on it for cheap.

This is a California model.

I've:

Change oil/filter
Relocated bars
Rear brake lever relocated
Grasshopper backrest
Alaska butt pad
lubed everything (windshield was practically welded on the rollers)
Transfer case drain/fill

Tonight I tackled the plugs and air filter

Gapped to .85mm OEM plugs DPR8EA-9
Oem air filter
dielectric grease on ends of boots
I am missing one bottom sleeve(whatever its called) on the back cyl left boot)

I was care to secure and successfully clamp down all air/vac lines but I am receiving a varied idle between 700-900 while before it was steady at 850ish. During light throttle its now missing/surging (lean condition).

My guess is i got a crack in a vac line or the 2 halfs of the airbox arent seated properly. I supposed a boot could be slightly unseated as well but it runs good on full or heavy throttle so I think spark is good.

Any advice is greatly appreciated.

2007 Stratoliner **Currently running great 4/22/16**
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post #2 of 33 (permalink) Old 03-24-2016, 12:55 AM Thread Starter
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i also pulled code 22 and 30 which is probably from the previous owner i cleared and they didnt return after a check ride.

errors are air temp sensor which i checked diag 5 and its functioning, tip over ia anyones guesa.
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post #3 of 33 (permalink) Old 03-24-2016, 09:47 AM Thread Starter
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Scratch my "missing" item on the rear left spark plug, looking at the fiche it appears to be the odd man out. Found the left 2 "vac" lines from the airbox are also just drains so nothing to worry about there either.

I'm thinking maybe a plug boot isnt fully seated. I was probably to gentle.

2007 Stratoliner **Currently running great 4/22/16**
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post #4 of 33 (permalink) Old 03-24-2016, 09:42 PM Thread Starter
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This was corrected by cleaning the plug leads and reseating.

2007 Stratoliner **Currently running great 4/22/16**
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post #5 of 33 (permalink) Old 03-31-2016, 11:45 AM Thread Starter
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Well this was not corrected. The miss came back under light throttle (under 20% on tps).

Looks like the DIAG D09 test shows 11.6 volts during the fuel pump voltage drop test. Pretty low, yamaha states this should be 12 or higher.

I pulled the battery, it looks like a recent replacement. With the low miles from the previous owner and the long years in service I'll assume the owner never put this bike on a maintainer and road it very little per year killing at least 2 batteries. I ordered a cheap battery from batterysharks.com, well see how it goes. I ordered a replacement multimeter (mine died) so I can then check old/new batt voltage and go through the charging system. Its entirely possible I have a charging issue as well but I doubt it.

I tested using the onboard D09 values by riding around at 75-80 for 15 minutes in 4th gear putting it in decently high rpm testing the charge rate. Pulled over and checked D09, went from 11.6 to 12. I then rode around for 15 minutes in traffic at under 1800 rpm voltage was 11.8. Seems like mid range rpm is putting out enough charge to bring volts up quickly and low rpm charge is enough to maintain and at least charge the battery. Terminals have been cleaned/sanded etc...

I rec my new battery and multimeter tonight, testing should be more definitive then.

http://racetechelectric.com/files/pd...flow_chart.pdf
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2007 Stratoliner **Currently running great 4/22/16**
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post #6 of 33 (permalink) Old 03-31-2016, 11:54 AM
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Keep us posted, good stuff!

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post #7 of 33 (permalink) Old 03-31-2016, 07:43 PM
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Engine off, battery should read 12.7 +. Engine idling, should be 12.5/8, at 3000 RPM should be 14V or better

4 wheels move the body
2 wheels move the soul
58 years behind bars
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post #8 of 33 (permalink) Old 03-31-2016, 10:35 PM Thread Starter
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welp found the problem. I cross threaded the front right plug so it wasnt seated fully which caused the missing.

Not sure what to do at this moment, retap the hole and pray a new plug doesnt blow out or take the head off and send it to a machine shop.

why do i do this to myself.

2007 Stratoliner **Currently running great 4/22/16**
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post #9 of 33 (permalink) Old 03-31-2016, 11:44 PM Thread Starter
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welp looked at the service manual, pulling the front head doesnt look like that big a deal on these non OHC motors. I'll pull the head, helicoil it or similar , install the dang plug the easy way, when the head is out of the bike

That way I know its repaired and much less chance of tapping/helicoiling crooked.

2007 Stratoliner **Currently running great 4/22/16**
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post #10 of 33 (permalink) Old 04-01-2016, 01:51 PM
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Wow man that really sucks. No matter what ya do, yer gonna have to pull the head to repair it so ya don't get any shavings in the engine. That would be really bad. Had to repair my quad when I got it cause someone did a heli-coil repair on the plug hole. What a mess! Had shavings even in the carburetor some how. Lots of damage. And they wondered why it wouldn't run, lol. Valves were stuck open permanently. Anyway, good luck in making your repairs and getting back into the wind.

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