Hawk 250 burning oil, Cone Air filter

a1a5115 · 06-10-2019, 06:08 PM

Hi,
Just before Christmas my son and I got a new Hawk 250 from RPS in Texas. He is the main rider and has enjoyed upgrading the bike. It has about a 1000 miles on it and starting seriously burning oil. He had put one of those "cone" air filters on it and had been doing quite a bit off road riding lately with his friends.
I pulled the top off the engine and the piston and rings were badly worn. I thought I would have trouble finding parts but I "googled" CG250 piston and was amazed at how available they were. From a ebay seller we got a new piston, rings, wrist pin and retainers for 15 bucks, FREE shipping.! I was also able to find the Honda service manual for the CG engine.
I honed out the cylinder and when we got the new piston it was identical to the old one. Put it all back together last night, runs great and no oil smoke.
I think if you are going to use your bike off road or in dusty conditions you might want to stick with a paper filter.
Hope this helps someone,
Paul

ChipToothy · 06-10-2019, 07:39 PM

By chance had the filter been properly oiled? I’ve ran mine through knee deep water along with dirt roading 50-100 miles a week and no gunk in the carb since I bought the bike 14 months ago.

It’s good the repairs were so cheap!!

a1a5115 · 06-10-2019, 08:28 PM

I'm not sure how it was oiled, but you can hold it up to the light and see plenty of spaces.

Megadan · 06-10-2019, 08:34 PM

Dual element foam filter with the inner foam oiled is much better if you will encounter dirt/dust. Gone several thousand miles on and off road and not one spec of dirt in my carb.

dpl096 · 06-10-2019, 09:05 PM

Quote:

Originally Posted by a1a5115

Hi,
Just before Christmas my son and I got a new Hawk 250 from RPS in Texas. He is the main rider and has enjoyed upgrading the bike. It has about a 1000 miles on it and starting seriously burning oil. He had put one of those "cone" air filters on it and had been doing quite a bit off road riding lately with his friends.
I pulled the top off the engine and the piston and rings were badly worn. I thought I would have trouble finding parts but I "googled" CG250 piston and was amazed at how available they were. From a ebay seller we got a new piston, rings, wrist pin and retainers for 15 bucks, FREE shipping.! I was also able to find the Honda service manual for the CG engine.
I honed out the cylinder and when we got the new piston it was identical to the old one. Put it all back together last night, runs great and no oil smoke.
I think if you are going to use your bike off road or in dusty conditions you might want to stick with a paper filter.
Hope this helps someone,
Paul

Plain and simple... You won't rebuild the top end of a jap bike with new parts mind you.... For 15 bucks. I'm glad it worked out for you

2LZ · 06-11-2019, 11:20 AM

Agree with MD. The K&N-type filters I use for street and light trail applications. Anytime I had a dedicated dirt bike, I got an Uni or Uni-type filter and oiled it. They work great for heavy dust.

**JerryHawk250** · 06-11-2019, 11:41 AM

Same here as MD and 2LZ. Properly oil filter will keep the dust out. My bike is quickly approaching the 6000 mile mark. I stuck my bore scope in over the weekend just to check things out. I still see cross hatch on the cylinder walls. Still has good compression as in no loss of. I have been running synthetic ever since my initial break-in. Approx. 800 miles.
Glad to see you got her fixed up.

Gotta love these low cost bikes. Try fixing a Jap bike for that cost. lol

Sport Rider · 06-11-2019, 02:30 PM

excellent that it was cheap to repair!

Wild Dog · 06-11-2019, 07:55 PM

Foam is the way to go, there are some foam filters that fit the stock airbox. Oil them from time to time and we are good to go.

Pathfinders · 06-11-2019, 09:07 PM

Congrats on the cheap fix.

Roy

Weldangrind · 06-12-2019, 12:26 PM

This is the one I like, but you might need a straight neck: https://www.ebay.com/itm/BLACK-42mm-...MAAOSwFV9X0l39

06-10-2019, 06:08 PM	#1
a1a5115 Join Date: Jan 2008 Location: Northwest Florida Posts: 39	Hawk 250 burning oil, Cone Air filter Hi, Just before Christmas my son and I got a new Hawk 250 from RPS in Texas. He is the main rider and has enjoyed upgrading the bike. It has about a 1000 miles on it and starting seriously burning oil. He had put one of those "cone" air filters on it and had been doing quite a bit off road riding lately with his friends. I pulled the top off the engine and the piston and rings were badly worn. I thought I would have trouble finding parts but I "googled" CG250 piston and was amazed at how available they were. From a ebay seller we got a new piston, rings, wrist pin and retainers for 15 bucks, FREE shipping.! I was also able to find the Honda service manual for the CG engine. I honed out the cylinder and when we got the new piston it was identical to the old one. Put it all back together last night, runs great and no oil smoke. I think if you are going to use your bike off road or in dusty conditions you might want to stick with a paper filter. Hope this helps someone, Paul
	4

06-10-2019, 07:39 PM	#2
ChipToothy Join Date: Apr 2018 Posts: 819	By chance had the filter been properly oiled? I’ve ran mine through knee deep water along with dirt roading 50-100 miles a week and no gunk in the carb since I bought the bike 14 months ago. It’s good the repairs were so cheap!! __________________ Bashan Storm: Ebay steel exhaust wrapped, folding shift lever, seat mod, vm26 carb, air pod, dual led scrambler headlamps, windshield mod, led brake/tail light, secondary led brake light (swingarm), Ebay 295mm rear shock, back up CDI (racing unknown), oil cooler, digital gauge cluster,
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06-10-2019, 08:34 PM	#4
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	Dual element foam filter with the inner foam oiled is much better if you will encounter dirt/dust. Gone several thousand miles on and off road and not one spec of dirt in my carb. __________________ 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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06-11-2019, 11:20 AM	#6
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,112	Agree with MD. The K&N-type filters I use for street and light trail applications. Anytime I had a dedicated dirt bike, I got an Uni or Uni-type filter and oiled it. They work great for heavy dust. __________________ "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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06-11-2019, 11:41 AM	#7
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,714	Same here as MD and 2LZ. Properly oil filter will keep the dust out. My bike is quickly approaching the 6000 mile mark. I stuck my bore scope in over the weekend just to check things out. I still see cross hatch on the cylinder walls. Still has good compression as in no loss of. I have been running synthetic ever since my initial break-in. Approx. 800 miles. Glad to see you got her fixed up. Gotta love these low cost bikes. Try fixing a Jap bike for that cost. lol __________________ 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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06-10-2019, 08:28 PM	#3
a1a5115 Join Date: Jan 2008 Location: Northwest Florida Posts: 39	I'm not sure how it was oiled, but you can hold it up to the light and see plenty of spaces.
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06-11-2019, 02:30 PM	#8
Sport Rider Join Date: Jan 2016 Location: Mooresville NC Posts: 2,116	excellent that it was cheap to repair!
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06-11-2019, 07:55 PM	#9
Wild Dog Join Date: Dec 2016 Location: Argentina Posts: 756	Foam is the way to go, there are some foam filters that fit the stock airbox. Oil them from time to time and we are good to go.
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06-11-2019, 09:07 PM	#10
Pathfinders Join Date: Nov 2017 Location: Upstate SC Posts: 129	Congrats on the cheap fix. Roy
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06-12-2019, 12:26 PM	#11
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	This is the one I like, but you might need a straight neck: https://www.ebay.com/itm/BLACK-42mm-...MAAOSwFV9X0l39 __________________ 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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