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Old 08-20-2009, 02:24 PM   #1 (permalink)
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Default 87 Octane and some other concerns

After I did my oil changed and replaced my push rod seal, I must've either accidentally f'd with the idle adjuster knob or when I refilled with 87 it started to sound really shitty.

I can blib the throttle and it has like a 50% chance of stalling when the needle drops back down.

This was the first time I put 87 fuel in it, but I didn't think it would idle this bad. I assumed that I messed with the adjuster knob by accident when I painted my fairing brackets black. I set that to a higher rpm, but ever since my needle broke off, I can't tell what rpm I'm at. Isn't it between 1000 and 1300?? I THINK thats where it is, but the idle still sounds rough (wont stall anymore). The bike runs like usual with throttle though. The only thing that seems different when I adjusted my idle higher, is that the "breathing" affect seems gone. Don't know how to explain it, but most or all inline 4's (especially the FI ones) will not have a clean exhaust note like cars do. It usually seems to alternate between 2 different exhaust tones, but I'm not sure if its just a coincidence between the 4 or 5 bikes I heard. Anyways, my exhaust note seems more random than usual. Not concerned about it that much, but I just wanted to see if its because of running 87.

My 2nd concern:
Only thing I THINK I hear is valve tapping and slight knocking, but I know these bikes naturally have a lot of engine noise. I'm at 15k miles with no engine check-ups like valve clearences, carb cleaning etc. but I DID sync them with a ghetto tool I made and turned my idle adjuster screws as best as I could. That was about 500 miles ago and I was happy with the results. How soon should I check my valves and is it possible to do this myself? I'm assuming a shop will charge up the ass to do it for me. Is there anything that I should check for at this milage? Besides the wear and tear parts like brake pads, chain/sprocket/etc
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Old 08-20-2009, 02:29 PM   #2 (permalink)
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sounds like the idle is too low.
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Old 08-20-2009, 03:45 PM   #3 (permalink)
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Put some seafoam in the tank, it'll help the bike run with 87 octane. Idle is 1100 +/- 100. But most of the guys here set it a little high, I tried setting at 1350 and I didn't like how it idled down.

I can't remember the mileage you're supposed to check the valves at but I'm pretty sure you're close to it. Do you have experience with checking shim valves? If not you're probably gonna be seriously irritated by it. Before you start I'd order all the seals and gaskets and get a shim kit, that way you'll have any size you need to adjust with.
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Old 08-20-2009, 03:59 PM   #4 (permalink)
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the 87 isnt the problem...
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Old 08-20-2009, 04:24 PM   #5 (permalink)
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I think I did mess with the adjuster screw by accident. The knob sits on a little u-ring type thing that makes it hard to squeeze out of the fairing bracket, so I must've turned it by accident. I was messing with the idle knob and it sounds a little better.

So its safe to run 87 on a carb'd bike? I thought FI bikes could run it fine, but wasn't so sure about ours (even though I don't think FI has much to do with combustion and stuff).
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Old 08-20-2009, 05:34 PM   #6 (permalink)
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Mine hates 87, hit the wrong button once and she ran like shit.
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Old 08-20-2009, 05:38 PM   #7 (permalink)
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I expect these threads in the 250 forum, but not in here.
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Old 08-20-2009, 05:41 PM   #8 (permalink)
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You want him to put it in the 2 wheel discussion section instead vex? We don't discriminate here so you can GTFO sir. Get back to PWT.
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Old 08-20-2009, 05:58 PM   #9 (permalink)
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Mine hates 87, hit the wrong button once and she ran like shit.
As does my 6R. Put it in once cause i needed fuel in a one horse town and thats all they had. Didn't think i was gonna make it home. My buddies RC51 ran fine on the same fuel so i know it wasn't bad gas.

Each his own i guess...
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Old 08-20-2009, 06:40 PM   #10 (permalink)
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the 87 isnt the problem...
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Mine hates 87, hit the wrong button once and she ran like shit.
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I expect these threads in the 250 forum, but not in here.
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You want him to put it in the 2 wheel discussion section instead vex? We don't discriminate here so you can GTFO sir. Get back to PWT.
My bike pinged on 87 at the pump, could have been a bad batch or something else. But I'm not willing to try it again either, so I use 91 with no problems. I've used the 93, but I can't tell a difference.
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