05-07-2020, 10:25 AM | #1 |
Join Date: May 2017
Posts: 5
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Ok just hear me out first - stroker hawk?
I’ve seen it asked about big bore kits for the hawk, seemed to me that even if there is still an offering it would be prone to overheating from thinner jug walls or not worth the investment for a minimal gain. But so far I haven’t seen it asked about a longer stroke crank and shorter connecting rod to increase displacement without altering the bore. Has anyone done any looking into this or am I blissfully ignorant to the limitations of the CG motors?
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05-07-2020, 11:03 AM | #2 |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,061
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the issue with that idea is that the CG motors are already a stroked and bored 125... hence why everyone says you cant bore them... theres just not any room left in the CG form factor for more displacement without a complete redesign.
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05-07-2020, 11:19 AM | #3 |
Join Date: May 2017
Posts: 5
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10-4, blissfully ignorant it is. I knew it was overbored but didn’t know for sure if it was stroked, much less stroked to the max. Was thinking there may be enough room to get another 3/8 to 1/2 inch of stroke
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05-07-2020, 11:34 AM | #4 |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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I've always hoped someone would regrind a performance cam for a CG. That would really be the icing on the cake, especially for those here who have ported their heads. My guess is that's the last place to look for more power, since more displacement isn't really a viable option.
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05-07-2020, 11:59 AM | #5 | |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,061
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Quote:
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05-07-2020, 12:07 PM | #6 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
The camshafts are by WGK out of Brazil. There are a couple of other companies that make profiles, but WGK is the only one that makes a cam that requires zero machine work for valve clearances or valve spring upgrades that has increased duration and overlap. That is the camshaft I have.
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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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05-07-2020, 03:43 PM | #7 | |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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Quote:
Also, do you have the cam profiles of both the stock and WGK cam for comparison?
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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05-07-2020, 05:42 PM | #8 |
Join Date: Aug 2013
Location: Goodyear, Arizona
Posts: 412
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I'm waiting on one of the 290 degree duration cams to ship from Brazil, apparently USPS isn't excepting any parcels from there due to MX beer flu
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05-07-2020, 06:22 PM | #9 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
This is the exact cam I have. https://wgkindustria.com.br/produtos...-titan-racing/ It has more total duration and overlap over a stock cam, but adds no more lift. It is a cam designed to be installed without needing to do any machine work or other upgrades. The most I could find on the stock CG cams was that they have 210 degrees of duration on the cam lobe, although there was no specifics as to if that was total duration, or duration measured at a certain lift point. They do have other cam profiles with technical data and even dyno comparisons showing where the power increase comes from, but most of those have an increase in lift which requires recessing the valve seats in the pockets more and potentially fly cutting the pistons for clearance.
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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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05-07-2020, 06:22 PM | #10 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Sounds like you ordered the same one I did. I had to wait almost 6 weeks for mine to arrive even without the whole shipping delays of this virus getting in the way.
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05-08-2020, 08:33 PM | #11 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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There is a 270cc water cooled version of the CG that is used in trike pick-up trucks; perhaps that crank could be used in a 223cc CG (assuming it's not the same stroke as the 223). Dunno. I might be tempted to buy one from Taobao and find out.
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05-09-2020, 05:12 AM | #12 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Funny thing is, most water cooled CG300 engines have a 64mm stroke while the air cooled CG250 has a 65mm stroke.
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