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#16 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Most of us here require supervision.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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#17 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
I still stand by what I say about where most of the improvement comes, which is the exhaust side. The intake port is honestly not too terrible, mainly just needing some port matching and smoothing out with some material removed around the guide and a bit of blending here and there. The increase in compression definitely can't hurt, but compression on it's own has never been a big factor in terms of power in my experience with engine building, and has often more been dictated by cam profile and maintaining a certain level of dynamic compression for proper ignition. The exhaust side is what holds back these little motors the most. The bowl and the roof of the port around the guide is too low and forces the gas to make a very sharp turn right into a giant wall of excess material around said guide at a rather nasty choke point. if I had to guess, 70% of all of the material I removed came from those areas of the exhaust port. My other suggestion, and one often left untouched by many, is to spend some time on the combustion chamber. At a minimum smooth out all of the sharp edges around the valves. I went a bit further and really blended all of the machinist ridges around the valves into the chamber itself to unshroud the valves as much as possible. This did increase my chamber volume a couple of CC's, but the benefit to flow past the valve into and out of the cylinder should not be under rated. This is how my chamber looked, almost all of this was done by hand except for the light polish job, which is kind of hard to see in the picture. This is what I started with for a comparison.
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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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#18 |
Join Date: May 2019
Location: Illinois
Posts: 864
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I started working on my spare head and it looks similar to yours Dan. I tried to deck it thirty thousands off. I didn't do much to the combustion chamber other than buffing it out. I ported and polished the exhaust port and left the intake port alone. I may revisit the intake port if I don't like the performance but I'm thinking it will give me what I want the way it is now. Since this is a counterbalanced engine the one difference I found is in the head gasket. The oem one is thinner than the xmoto gasket I bought, so I ordered one from CSC. Mine also doesn't have the one O-ring on the stud like yours in your video.
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2022 Venom KPR 200 Red- the fastest color 16t and 46t sprockets, NGK Iridium CPR8EAIX-9, aftermarket full exhaust system. Top speed 81GPS 2023 Venom SS3 KP mini 150– Nibbi carb, Nibbi air filter, aftermarket muffler, decat 2022 Venom Ghost chopper 250 1997 Honda GL1500 Goldwing 1978 Kawasaki KL250 https://youtube.com/@herbiesgarage681 Last edited by herbie; 10-26-2019 at 09:55 AM. |
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#19 |
Join Date: Sep 2019
Location: Machesney, IL
Posts: 30
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I went to order the head from CSC and should not have mentioned the Hawk - My mistake now that cannot be undone. Here is what I requested.
Please quote the complete head assembly including head, valves, springs, rockers and gaskets for my Hawk CG 250. I know dumb move....... Their answer below. James, We do not sell Hawk parts, we only sell CSC TT250 engine parts. I cant tell you if the head for the TT250 is the same as the Hawk, they are different engines made from 2 different factories. Here is a link to our parts for that engine, if you buy it for a hawk there is no return if it doesn’t fit. Thanks |
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#20 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,655
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Don't worry it will fit. We have a few members that already installed them.
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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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#21 |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Don’t worry they fit n better made etc
Old mate Motocheez has a head I dropped off but he’s not done it yet You only need a head assembled you don’t need the top rockers etc Valves in head and that’s enough Head gasket n grab an extra cover gasket maybe exhaust gasket too. |
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#22 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,655
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If you haven't ordered it yet you can get it for much less at Brozz250.com. https://shop.brozz250.com/eshopprod_...r_Assembly.htm
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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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#23 |
Join Date: Sep 2019
Location: Machesney, IL
Posts: 30
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I allready put in the order with CSC.
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#24 | |
Join Date: Sep 2019
Location: Machesney, IL
Posts: 30
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Ordered from Brozz
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Thank You Jerry.... ![]() |
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#25 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
Funny thing is, CSC is almost half the price of RPS parts through their dealers.
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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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#26 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,655
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Quote:
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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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#27 |
Join Date: Jul 2017
Location: Montucky
Posts: 209
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I've had a TT250 head on for 2 years, works great.
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1983 Honda Xl600R 2016 Ducati Multistrada 1200S DVT |
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#28 |
Join Date: Oct 2019
Posts: 2
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can i buy a head for a borzz all ready done. mixerdriver 632
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#29 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,655
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No, Not unless someone decides to start doing it. I would and have done a couple but I don't think you would want to pay the price. lol It takes a good bit of time to port and deck a head. If someone had a CNC machine that was programmed to do it then it might be doable at a reasonable rate. Porting is not hard, just time consuming.
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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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#30 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
EDIT: Nevermind, he beat me to the post by like 3 seconds.
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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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Tags |
cg250, dlx, hawk, head |
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