05-03-2017, 09:45 PM | #1 |
Join Date: Mar 2017
Location: Merrill, WI
Posts: 20
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Another Hawk Tuning Question
Not another tuning question!!!
Anyway, here is the rundown on my Hawk: 600 miles on the bike, valves have been adjusted. NGK plug, airbox mod,17/45 sprocket, stock carb and until today a 115 main with a stock exhaust, save for a couple holes poked in the rear baffle. The bike was running great. Today I cut the cat out of the stock exhaust and thinking it would be running lean switched to a 125 main. The bike ran great all the way up to full throttle/60mph when it started hesitating/hicupping slightly. Do you think I'm still lean? If so does anybody know where a 130+ main can be found? |
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05-03-2017, 10:07 PM | #2 |
Join Date: Mar 2017
Posts: 203
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I'd try going back to the 115 jet. Did you look at the plug afterwards to see how it's burning? Should be dark to medium tan. If it's lean it will be a light tan color, and too rich it will be almost black.
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05-04-2017, 10:43 AM | #3 |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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Like rwl says, go back to the 115. If that still doesn't work, then try moving the needle clip to the fourth notch down. If it's not notched, put a small washer under the clip.
Set your idle mixture at 2 turns out, then adjust in and out from there.
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05-04-2017, 10:50 AM | #4 |
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Join Date: Oct 2016
Location: Houma, La.
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Ditto
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05-04-2017, 10:55 AM | #5 | |
Join Date: Sep 2015
Posts: 436
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Quote:
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05-04-2017, 12:45 PM | #6 |
Join Date: Mar 2017
Location: Merrill, WI
Posts: 20
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Thanks guys, I will do some puttering around on it, needle is already shimmed with 2 washers.
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05-05-2017, 03:20 PM | #7 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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I would think that a 125 main should be plenty enuff. If you can find slow jets for that carb, go up on that. The slow jet feeds fuel all the way up. It can't pass a lot of fuel, but it still effects top end. The slow jet problem is why a lot of people have switched to a Mikuni carb. It is much easier to get really good carburation if you can change both jets. Mikuni calls the slow jet a pilot jet....ARH
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05-05-2017, 09:10 PM | #8 |
Join Date: Mar 2017
Location: Merrill, WI
Posts: 20
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Thanks ARH, Mine seems to be liking a 120 main with the stock slow jet. Plug seems to tell me it's not running fat, but I'm getting that slight "burble" when I chop the throttle, always thought that meant it was NOT too lean.
Took it up to full throttle several times, got only one tiny hiccup the first time then it ran fine. I'm going out on an overnite adventure this coming week, we will see how it runs. If nothing else 30-40 bucks for a Mikuni will be probably be in my future. |
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05-05-2017, 10:10 PM | #9 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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Quote:
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05-05-2017, 11:52 PM | #10 |
Join Date: Mar 2017
Location: Merrill, WI
Posts: 20
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ARH,
I'm thinking my "burble" is your "woolie"! I'm not too concerned about it at this point and am feeling better after getting your input. Thanks! |
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05-06-2017, 01:07 PM | #11 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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Quote:
get repeatable results....ARH Last edited by Ariel Red Hunter; 05-06-2017 at 01:08 PM. Reason: A miss spell |
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05-06-2017, 02:50 PM | #12 |
Join Date: Apr 2017
Location: Ca
Posts: 32
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Ok I have a high idle issue I've tried adjusting screw on carb and throttle cable with no luck I put the vm26 with 115 jet on the hawk the idle screw turned all the way in and out has no effect constant high idle . Any ideas ?
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05-06-2017, 04:29 PM | #13 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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On a VM-26 there are two idle adjusting screws, one an idle mixture screw, the other an idle speed screw. How high (fast) is the idle?...ARH
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05-06-2017, 04:47 PM | #14 |
Join Date: Apr 2017
Location: Ca
Posts: 32
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Ok I think it was cable binding I played with it again and got it idled down . I didn't know there was more than the screw on the side to make adjustments with . Thank you for you quick responses arh
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05-06-2017, 10:36 PM | #15 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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It will pay you dividends to route the throttle and clutch cables to where you have nice, easy curves in the cable. These bikes are kind of thrown together at the factory, as are most other bikes. When I worked at a dealership we spent whatever time was necessary to get cable runs smooth and in gentle curves....ARH
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