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03-21-2021, 07:09 PM | #1 |
Join Date: Mar 2021
Posts: 15
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2020 rps hawk fuel problem
Hi. New to getting help this way so sorry for whatever. I recently bought a hawk and it was running okay but was running lean so I tried adjusting the fuel are mixture to no avail. Now all it does is run on cold then when hot it stumbles on acceleration and runs Rich no matter how I adjust the fuel-air mixture and I've tried changing the Jets. It's a nibbi 30mm that has the stock jets. Any help will be appreciated.
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03-22-2021, 12:07 AM | #2 | |
Join Date: Feb 2020
Location: Buffalo NY
Posts: 224
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03-22-2021, 08:11 AM | #3 |
Join Date: Mar 2021
Posts: 15
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I'll have to check the jet numbers forgot to write it down. Stock exhaust with cat delete. New fuel lines, filter and fuel cut off switch. Vacuum leaks? Like in the intake Manifold? How would I find out if I do have a vacuum leak? I'm used to working on small engines and trucks so would I do the same thing as a car and spray brake cleaner around the area to find a leak if there is one?
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03-22-2021, 08:57 AM | #4 | |
Join Date: Aug 2019
Location: Bay City, MI
Posts: 398
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Definitely get those jet numbers... and it matters what your elevation is as well. |
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03-22-2021, 09:12 AM | #5 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Good starting point on jets are a 40 pilot and 110 main. Get the idle mixture resolved first then work on main jet tuning after you have the pilot jets and mixture adjusted.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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03-22-2021, 01:19 PM | #6 |
Join Date: Mar 2021
Posts: 15
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Do you know what I should put the screw at? I currently have it set to 1 3/4 turn.
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03-23-2021, 12:11 AM | #7 |
Join Date: Mar 2021
Posts: 15
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My current elevation is 600-663ft. I've never had to factor in my elevation so any help understanding what I need to do will be mu h appreciated.
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03-22-2021, 01:15 PM | #8 | |
Join Date: Mar 2021
Posts: 15
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P.s, if she running good enough then don't fix or improve itdoh: |
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03-22-2021, 02:40 PM | #9 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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I think doing a bit of research on how the jets affect different aspects of throttle position would go a long way here. You are adjusting the idle mixture because the engine is blowing black smoke and cutting out at what I can only assume is near wide open throttle conditions.
So, right off the bat, you are in for a bad time. You have little carb tuning experience and you are trying to tune a too big carb on a nearly stock bike. Jet suggestions from the guy who first installed a PE30 on a Hawk? 35 or 38 pilot jet. Needle, for now leave it in the 3rd slot, but once you sort out the pilot, idle mixture, and main we can revisit as it may need to go up one slot to the 2nd one. Main jet. 128 is too big. A 115 is likely going to be the ticket, but you will have to do the work to determine where it should be. The PE30 is a tricky carb to get the tune dialed in with, especially on a bike with no head porting. It's like putting an 850cfm Holley on a 289 chevy small block.
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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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03-22-2021, 03:15 PM | #10 | |
Join Date: Oct 2020
Location: Central VA
Posts: 1,259
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My Brozz with the PE30 is running great with my jetting listed in my sig.. the only hiccup i notice is if i go wide open and pin it for a bit and then let off abruptly the bike will feel like the engine is pausing for lack of a better way to explain and will pop once or twice.. could this be too rich on the main with the 140? It builds up to full speed with no issues, its just the letting off abruptly that causes this symptom.. thanks
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03-22-2021, 06:55 PM | #11 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
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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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03-23-2021, 12:33 AM | #12 | |
Join Date: Mar 2021
Posts: 15
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Didn't realize I bought a carburetor that was to much to start with. I will have to order the jets. any suggestions on what brand will be good? Or does it matter? Head porting? Aftermarket exhaust? CDI and coil suggestions would be great if it will help my hawk have a better life. I'm doing research but unsure who to listen to lol. Like I said I'm new to bikes but have experience with small engines like chainsaws and the like , trucks and cars. The Holley reference was great by the way. I understand that talk great lol. Side note, should I adjust the valves? A couple people said they always come to tight. Last edited by Nab; 03-23-2021 at 12:37 AM. Reason: Misspelling |
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03-23-2021, 03:37 AM | #13 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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I think the issue with the Nibbi PE30 is that, after I installed it and then made videos about it, people ignored all of the other elements about my bike and just heard me say "Yeah, more power!!!" and "Nibbi PE30" and just assumed it was a good upgrade lol. Then others saw them do it, and so on, and eventually it just spiraled into a "Just get this carb" thing. It can work on a mostly stock bike, but it can be a challenge to get it dialed in, so be prepared for a bit of a struggle. As far as jets, I am always a fan of quality jets, either OEM or OEM equivalents from jetsrus.com 99101-393 and N424-21 for main and slow jets. However, one can always use one of the many jet kits out there on Amazon. This is one that I have used and have been satisfied with their performance. https://www.amazon.com/Supermotorpar...484744&sr=8-11 As far as CDI and coil. At this point I wouldn't worry about it too much. Focus on getting it running. Head porting and exhaust mods are going to be the best bang for the buck if you are chasing some extra power, and with a ported head the PE30 is going to be better utilized. Also, yes, adjust the valves. They do come tight from the factory. For break in I recommend setting the valves to .07-.08mm aka .003". Then after that you can set them a bit tighter at .05mm/.002in for little less noise.
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03-30-2021, 10:30 PM | #14 | |
Join Date: Mar 2021
Posts: 15
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03-31-2021, 01:49 AM | #15 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Interesting that the jet sizes are very similar to those needed for a PZ30. As far as the head porting goes, there are a couple of guys that offer porting for the CG heads that have done a bunch for other guys. Joe Henner racing or Corey from LFR Powersports. This is Corey's page. https://www.facebook.com/LFRPowersport/
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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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nab means new at bikes |
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