Oil flowback on hawk/magician engine?

DualSport · 12-01-2018, 04:57 PM

I wanted to make a dedicated thread for this. Can someone explain the oil flowback on the RPS engine? I know there is a o-ring between the cylinder and head that I guess keeps the oil pumped up to the sprayers above the valve adjusters from going in to the piston by the head gasket but I never seen the rest of the system.

pete · 12-01-2018, 08:42 PM

flow back !!!... it returns to the crank case by running
down the push rod holes or cam chain tunnel..

not sure if that was what you were asking or not..?

..

NzBrakelathes · 12-01-2018, 09:37 PM

Pull the engine down and all that knowledge will reveal it self.
Kinda basic and yeah loads of space to let the oil flow down the push rod area.
the O ring you mentioned it the oil passage on the pressure side to feed the oil to the top end.

Mudflap · 12-02-2018, 04:42 AM

If you can find a factory service manual for a Honda CG 125 there is an oil flow diagram.

**JerryHawk250** · 12-03-2018, 03:24 PM

Here ya go.

DualSport · 12-11-2018, 02:07 PM

I took these two weekends ago. Yeah I see how it pumps through this cast vein up to the adjuster sprayers and gravity feeds back through the pushrod holes on the other side. I eliminated it as a cause of oil getting in the combustion and coming out the exhaust by checking it and putting a new seal in. I'm in the process of getting a new cylinder now since I already put a new head and head-gasket on..

NzBrakelathes · 12-11-2018, 08:23 PM

Quote:

Originally Posted by DualSport

I took these two weekends ago. Yeah I see how it pumps through this cast vein up to the adjuster sprayers and gravity feeds back through the pushrod holes on the other side. I eliminated it as a cause of oil getting in the combustion and coming out the exhaust by checking it and putting a new seal in. I'm in the process of getting a new cylinder now since I already put a new head and head-gasket on..

Cylinder and piston should be a matched set, they should have the correct clearances etc and new rings

Red Hawk · 12-11-2018, 10:32 PM

Ummm, the connecting rod is "Blue" like it over heated.

NzBrakelathes · 12-11-2018, 11:29 PM

Quote:

Originally Posted by Red Hawk

Ummm, the connecting rod is "Blue" like it over heated.

I think you will find that is from forging the con rod

Red Hawk · 12-11-2018, 11:52 PM

Then the whole connecting rod will be blue not just the center, that got hot. How lean was the mixture?

It's shot peaned or mass finnished after machineing, no color. This is different.

timcosby · 12-12-2018, 01:14 AM

if its getting oil in the combustion chamber it will smoke like a freight train. id check specs on the barrel and piston and rings befor ordering new ones to make sure this is a problem.

12-01-2018, 04:57 PM	#1
DualSport Join Date: Sep 2018 Posts: 173	Oil flowback on hawk/magician engine? I wanted to make a dedicated thread for this. Can someone explain the oil flowback on the RPS engine? I know there is a o-ring between the cylinder and head that I guess keeps the oil pumped up to the sprayers above the valve adjusters from going in to the piston by the head gasket but I never seen the rest of the system.
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12-01-2018, 08:42 PM	#2
pete Join Date: Jan 2012 Location: ChCh , NZ Posts: 2,262	flow back !!!... it returns to the crank case by running down the push rod holes or cam chain tunnel.. not sure if that was what you were asking or not..? .. __________________ 09 XT660R ... 06 TTR250 ... 80 Montesa H6 125 Enduro... 77 Montesa Cota 348 MRR "Malcom Rathnell Replica"... Current resto projects.. 81 Honda CT110... 80 Kawasaki KL250A1... 11 Husaburg TE125 enduro... "sold" along with another 31... Lifan 125 Pitbike.. "stolen" ... KIWI BIKER FORUM...... http://www.kiwibiker.co.nz/forums/content.php All the best offroad rides in NZ... http://www.remotemoto.com/ E-mail... xtpete1@gmail.com
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12-11-2018, 10:32 PM	#8
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	Ummm, the connecting rod is "Blue" like it over heated. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
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12-11-2018, 11:52 PM	#10
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	Then the whole connecting rod will be blue not just the center, that got hot. How lean was the mixture? It's shot peaned or mass finnished after machineing, no color. This is different. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
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12-12-2018, 01:14 AM	#11
timcosby Join Date: Nov 2016 Location: robertsdale alabama usa Posts: 1,007	if its getting oil in the combustion chamber it will smoke like a freight train. id check specs on the barrel and piston and rings befor ordering new ones to make sure this is a problem. __________________ 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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12-01-2018, 09:37 PM	#3
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	Pull the engine down and all that knowledge will reveal it self. Kinda basic and yeah loads of space to let the oil flow down the push rod area. the O ring you mentioned it the oil passage on the pressure side to feed the oil to the top end.
	0

12-02-2018, 04:42 AM	#4
Mudflap Join Date: Sep 2014 Posts: 1,894	If you can find a factory service manual for a Honda CG 125 there is an oil flow diagram.
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