04-24-2018, 07:43 PM | #16 | |
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'17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust |
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04-24-2018, 07:51 PM | #17 |
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Did you visually check to see if the slide is fully open in the WOT position? Is there excess slack in the throttle cable?
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04-24-2018, 07:52 PM | #18 | |
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04-24-2018, 07:57 PM | #19 |
Join Date: Apr 2018
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I could blow through the jets. Throttle plunger opens and closes completely with no slack. Puzzles the crap out of me... On stock sprockets I couldn't get beyond 45, downhill... And I only weigh 160
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'17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust |
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04-24-2018, 08:01 PM | #20 |
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I would do a compression test just to rule out if there's any issues with rings or leaking valves.
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04-24-2018, 09:19 PM | #21 |
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Compression is @150. Not sure what's normal for these motors?
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'17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust |
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04-24-2018, 09:20 PM | #22 |
Join Date: Jan 2018
Location: Forney Texas
Posts: 498
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Im think that if it drops the ball after 1/4 throttle in any gear with different jets that possibly your pulling in air through a screwed gasket.
It may only happen after the engine develops more force (at a quarter turn) before it pulls in more air, it sounds unlikely on a new bike but possible. I'm grasping at straws here! I would more than likely put the Makuni on it and double check all the seals around the carburetion system. I can clearly hear that the bike wants to run, just be patient and go through the motions, you'll get it purring. |
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04-24-2018, 09:26 PM | #23 |
Join Date: Apr 2018
Posts: 22
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The good news (I think), on my way to the auto store to buy the compression tester, I got to 58 downhill It couldn't hold though, generally seemed to settle in around 49 straight, 45 or so uphill in 5th gear.
I may have to find that mikuni somewhere other than Amazon, 30 days backordered there.
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'17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust |
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04-24-2018, 09:44 PM | #24 | |
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04-25-2018, 08:13 AM | #25 |
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Motor does sound weak in the video. I don't know if you were giving it full throttle. I think once you get the new exhaust on it and tune for that you will notice a difference. Also once you get some miles on it and broke in you will notice an improvement in speed.
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04-25-2018, 08:38 AM | #26 |
Join Date: Apr 2018
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Chain has some play, but I'll loosen it a little more for additional testing.
Video was with WoT through each gear. I've also found a Mikuni on ebay. Either way, I'll report back findings with whatever appears to make the difference. 150 lb compression sounds reasonable to me; but I don't know these engines to know if that proves/disproves valve/ring leak. I definitely appreciate everyone's thoughts on it. As frustrating this is to someone stubborn like me, fun factor is already exceeding expectations!
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'17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust |
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04-25-2018, 01:00 PM | #27 |
Join Date: Apr 2017
Location: Omaha, NE
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I live in a very hilly (not small hills either) area well known for it's wind, and my bike is geared taller than his while carrying my much heavier body around, and I can hold 60mph all day long, with a head wind up a hill.
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04-25-2018, 06:33 PM | #28 |
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that being full throttle it does sound weak like there is a restriction. check and make sure the air filter isnt soaked with oil as someone said it only holds a quart but manual says 1.6. if you had put in 1.6 it would of puked it into the air box and onto the filter which would restrict air. try running with out filter and you will know if thats it.
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04-25-2018, 06:39 PM | #29 |
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Location: Omaha, NE
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My hawk holds 1.4 quarts to reach the center of the sight glass with the system completely drained. That means drain plug and filter screen cap removed and letting it sit to drain for several minutes.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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04-25-2018, 10:12 PM | #30 |
Join Date: Apr 2018
Posts: 22
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I was able to put another 30 miles on tonight.
Checked air box, it's bone dry. Confirmed the intake from box to carb is also clear. Ran without the filter on, no difference. I also ensured chain has a little play under load using a ratchet strap to simulate rider. Also dropped a 120 main jet in, ran carb cleaner through all jets, everything seems clear for intake. The 120 jet didn't really have an effect either. Have a multimeter, ground checks out across chassis. Confirmed intake and exhaust valves are moving, holding that .003 lash on both. I don't know if CDI or coil would have this effect, any way to check the output on these motors? Really hoping exhaust is the issue, running slim on other thoughts...
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'17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust |
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