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08-08-2018, 07:33 PM | #1 |
Join Date: Jul 2018
Posts: 212
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Adjusted Valves - Hawk
So I did my first valve adjustment - engine has about 150 miles on it so I figured now was a good time. Pulled the spark plug and found TDC by using the kick starter. I adjusted the exhaust to .005" and the intake to .004" using my feeler gauge set (I know some have said 0.004" on the exhaust and 0.003" for the intake, but my feeler gauge only goes down to 0.004"). Those valves were REALLY tight from the factory. I had to use a small pair of vise grips to loosen those gap adjustment screws before they would turn by hand. Finally I got 'em loose enough to turn by hand then adjusted using the feeler gauges, and wrenched the nuts down tight, then double checked again to make sure the proper gap was set.
The engine fires up quick and runs great as usual - I notice a lot more "clicking" noises from the engine compared to before. Just wanted to make sure this wasn't a sign that there's too much of a gap.
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2018 RPS Hawk 250cc Mods so far: 1. Mikuni VM26 Carburetor w/#115 main jet 2. 17T/45T JT sprockets 3. JT 428 X-ring chain 4. Air box mod 5. Hawk Digital Cluster 6. Aftermarket IMS shift lever 7. Performance Aftermarket Exhaust 8. 295mm Nitrogen Gas Monoshock, 20W oil front forks |
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08-08-2018, 07:39 PM | #2 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Tappy valves are happy valves.
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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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08-08-2018, 08:04 PM | #4 |
Join Date: Jul 2018
Posts: 212
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It's definitely running a little rich now...doesn't bog but at full throttle, but the RPM's don't come up enough so top end speed is limited to about 55mph. Spark plug is pretty dark as well. Engine is running cool though, but I'm definitely going to pull the carb, drop down to a #115 main jet and raise the snap ring to the middle slot of the needle instead of the 2nd lowest slot. Bottom fuel adjustment screw on the carb probably needs to come in a full turn or so as well. Valves definitely sound good though...nice and slappy.
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2018 RPS Hawk 250cc Mods so far: 1. Mikuni VM26 Carburetor w/#115 main jet 2. 17T/45T JT sprockets 3. JT 428 X-ring chain 4. Air box mod 5. Hawk Digital Cluster 6. Aftermarket IMS shift lever 7. Performance Aftermarket Exhaust 8. 295mm Nitrogen Gas Monoshock, 20W oil front forks |
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08-08-2018, 08:28 PM | #5 |
Join Date: May 2017
Location: Des Moines, IA
Posts: 120
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Drop down to a 115? Maybe I missed it in some of your other posts but I assume Then you must have done something like aftermarket exhaust and pod filter or the like to be running that big of a main. I’ve just never heard of anyone running larger than 115 before is why I ask.
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08-08-2018, 08:53 PM | #6 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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I have to agree. A 115 will be about perfect with the mods you have.
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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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08-08-2018, 10:05 PM | #7 | |
Join Date: Jul 2018
Posts: 212
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Quote:
I have the aftermarket exhaust and opened up the airbox. The #120 was running too rich no doubt (very noticeably rich after adjusting the valves), even the #115 seems a little rich at full throttle so I may downsize to a #110. The bottom-most fuel mixture screw is out 1.5 turns which was the Mikuni factory setting...clip is back on the middle slot of the needle (also the default setting from the factory). The engine runs well otherwise...no bogging, and idling is perfect, right around 1200 RPMs. I'll run with the #115 for awhile and will likely adjust down by the weekend. Ran into a glitch when I reinstalled the Mikuni carb and started the engine...it flooded out quickly and all sorts of fuel ran out that overflow line. Turns out the float was hung up on something, easy fix.
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2018 RPS Hawk 250cc Mods so far: 1. Mikuni VM26 Carburetor w/#115 main jet 2. 17T/45T JT sprockets 3. JT 428 X-ring chain 4. Air box mod 5. Hawk Digital Cluster 6. Aftermarket IMS shift lever 7. Performance Aftermarket Exhaust 8. 295mm Nitrogen Gas Monoshock, 20W oil front forks |
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01-16-2019, 04:39 PM | #8 |
Join Date: Dec 2018
Location: Glencoe, AL
Posts: 6
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I did my first valve adjustment on my Hawk today. They were both very tight with no room to get the feeler gauge in. When I was done, I was amazed how quickly the engine fired. After a short ride, I had to turn the idle speed down twice to calm it down. Very positive change from this.
On word of caution for those of you that don't own a bike lift. It you remove the large round cover with the bike on the side stand, oil runs out!!! |
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01-16-2019, 06:38 PM | #9 |
Join Date: Feb 2018
Location: WI
Posts: 213
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ok so valve adjustment question.
So I removed the plug to see the top center T mark. I removed the side cover to access the bolt to rotate the flywheel counterclockwise stopping on the T the valves where super tight so loosened and set them to .002 I rotated the flywheel 3 times stopped on the T mark and the valves are so very loose rotated it one more time again stopping on the T mark its back at .002 so when should I set the valves when it is on the loose setting or tight setting? |
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01-16-2019, 11:14 PM | #10 | |
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
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Quote:
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1991 harley heritage softail classic 2016 hawk kaw h1 400 tripple 13' long chopper in progress 2009 johnny pag bar hog 2004 hd electra glide ultra classic shriner edition 1997 harley davidson 1200 sportster 1972 harley davidson amf sx250 |
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01-16-2019, 11:21 PM | #11 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
You set your valve lash at TDC on the exhaust stroke. What these guys seem to be forgetting is that on a 4 stroke engine there are two TDC positions, one during compression, one during exhaust. You need to set your valves for TDC on the compression stroke. Turn the engine over until you get to the T where the valves are very loose. Set them to spec in that position. Once you do that, rotate the engine over and watch the intake valve (carb side). Once you see that valve open (rocker pushes it down) keep rotating it until you see the T mark again and line it up - this will be TDC on the compression stroke. Double check your valve lash, it should be what you set it to previously.
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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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01-16-2019, 06:44 PM | #12 | |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Quote:
This tool set with gaskets might just be the answer if your feeler gauges hasn't got the right sizes - being metric has a much smaller increments. Intake I usually do 0.06 (just under 3 thou) exhaust 0.08 (just over 3 thou) I test with 1 size smaller and that should glide thu easily and 1 size bigger and that goes thru with force showing me the size I used is within range. Sorta old fashioned Go no GO idea etc |
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01-16-2019, 11:56 PM | #13 | |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Just ask Jerryhawk! |
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01-17-2019, 07:41 AM | #14 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Tool does make it much easier.
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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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03-19-2019, 09:56 PM | #15 |
Join Date: Jan 2019
Location: Corpus christ TX
Posts: 27
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I am setting my valve lash tomorrow am I supposed to do this on a dead cold engine or a warm engine ? Also I am seeing 2 lines on the fly wheel a long line Followed by a shorter line about 1/3rd of a inch apart what one is tdc ?
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