2008 Roketa RKM-200E5 specs.

Youpa · 04-15-2008, 01:41 PM

i'm researching the 2008 Roketa RKM-200E5 and i'm seeing different specs for it. one site says 16.1 hp at 8,000 rpms and another says 15.4 at 9,500 rpms and there the same model. are they just guessing according to weigh or is 1 better than the other?

Rich

culcune · 04-15-2008, 01:42 PM

guessing/optimism (i.e. 85 mph top speeds, 100mpg)

fatboy250 · 04-15-2008, 03:50 PM

It may depend on whether it's OHC or Pushrod

usmc-mustang · 04-15-2008, 03:59 PM

Quote:

Originally Posted by fatboy250

It may depend on whether it's OHC or Pushrod

Yeah, I would say the lower spinning rpm motor would be the pushrod motor.

I am still in debate with the quality of the OHC motor. Even the Lifan seems to have small passages for crucial motor oiling to the camshaft. There have been some claims to camshafts seizing, a small particulate plugging the feed line could and would cause an issue.

katoranger · 04-15-2008, 04:01 PM

Quote:

Originally Posted by usmc-mustang

Quote:

Originally Posted by fatboy250

It may depend on whether it's OHC or Pushrod

Yeah, I would say the lower spinning rpm motor would be the pushrod motor.

I am still in debate with the quality of the OHC motor. Even the Lifan seems to have small passages for crucial motor oiling to the camshaft. There have been some claims to camshafts seizing, a small particulate plugging the feed line could and would cause an issue.

Mine seems to be done at 8-8.5K and it is a pushrod. The OHC probably spins alittle more.

Youpa · 04-15-2008, 09:14 PM

so whats better? ohc or pushrod? i'm guessing ones faster?

SpeedSouth · 04-15-2008, 09:27 PM

Quote:

Originally Posted by Youpa

so whats better? ohc or pushrod? i'm guessing ones faster?

Faster? I believe it has already been stated that the OHC would spin faster (higher RPM's).

If you're asking about overall speed of the bike, that is something determined more by gearing than the engine RPM's. Either could be geared to perform similarly.

Someone please correct me if I'm wrong. I'm certainly no exert.

Youpa · 04-16-2008, 12:16 AM

how much faster would you say we are talking? i dont see ANYTHING about pushrod or ohc engine. :roll: i just checked about every sale site they were on and searched the page and didnt find anything. o, and are there powerbands on these bikes? i'm not really shure.

usmc-mustang · 04-16-2008, 03:17 AM

I have two pushrod motors, and one has had its issues, and it was with the cam. With proper service, both are excellent motors.

The pushrod motor is likely to have more torque down low, where the OHC motor is likely to have higher top end HP. The best motor for torque would be a 169 with a pushrod, with its longer rod-angle to stroke ratio. Where the 163 with an OHC would have the best high RPM performance.

The sad part is that we are only talking about a few foot lbs of torque, not alot. Speed is going to be determined by alot of factors. GVW, Gear ratio. Never Dyno'd or had an intrest in it. If you look at the motor, it is easy to ID a pushrod vs an OHC. The OHC has a large silver cover on the side of the head that will likely say "OHC". Also, it appears to have 2 large bolts in the top of the valve cover, one in the front, the other in the rear.

Want to link the page to the company, might make it easier on the rest of us..

Youpa · 04-16-2008, 12:37 PM

there arent 2 bolts if i'm looking at it right so its gotta be a pushrod.

madmanjustice · 04-16-2008, 01:29 PM

if this pic is any indication, its the pushrod motor

http://store.oohla.com/storefiles/te...1949152874.jpg

red2003 · 04-16-2008, 01:41 PM

Quote:

Originally Posted by usmc-mustang

The best motor for torque would be a 169 with a pushrod, with its longer rod-angle to stroke ratio. Where the 163 with an OHC would have the best high RPM performance.

Not to nit-pick, but the 169 has a larger bore and shorter stroke then the 163, so it should have LESS torque compared to the 163; all other things being equal. The 169 should be a higher reving engine too with such a short crank stroke.

Youpa · 04-16-2008, 11:53 PM

yup thats the bike

this is probly a stupid question (considering i dont know bikes too well) but is there a powerband on that bike? i couldnt find anything about it and if theres not, can 1 be put on?

driller · 04-17-2008, 12:22 AM

Youpa, not sure what you are asking. The power band is the range of rpm that the engine makes the most power.

04-15-2008, 01:41 PM	#1
Youpa Join Date: Apr 2008 Location: PA Posts: 19	2008 Roketa RKM-200E5 specs. i'm researching the 2008 Roketa RKM-200E5 and i'm seeing different specs for it. one site says 16.1 hp at 8,000 rpms and another says 15.4 at 9,500 rpms and there the same model. are they just guessing according to weigh or is 1 better than the other? Rich
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04-15-2008, 01:42 PM	#2
culcune Join Date: May 2006 Location: Yuma, Arizona Posts: 9,035	guessing/optimism (i.e. 85 mph top speeds, 100mpg) __________________ "They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard
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04-15-2008, 03:50 PM	#3
fatboy250 Join Date: Sep 2006 Location: COLUMBIA, SC Posts: 973	It may depend on whether it's OHC or Pushrod __________________ 2008 Jonway MC-70-150 2007 Roketa DB-07B (RSM-200E) 2006 Roketa DB-07A (RSX-200E) 1995 Kawasaki Concours (ZG1000)
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04-16-2008, 01:29 PM	#11
madmanjustice Join Date: Aug 2007 Posts: 135	if this pic is any indication, its the pushrod motor http://store.oohla.com/storefiles/te...1949152874.jpg __________________ 2005 Roketa rat bike - The Ratketa 1982 Yamaha Maxim 750 The Ratketa Restoration Project The Ratketa Blog
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04-15-2008, 09:14 PM	#6
Youpa Join Date: Apr 2008 Location: PA Posts: 19	so whats better? ohc or pushrod? i'm guessing ones faster?
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04-16-2008, 12:16 AM	#8
Youpa Join Date: Apr 2008 Location: PA Posts: 19	how much faster would you say we are talking? i dont see ANYTHING about pushrod or ohc engine. :roll: i just checked about every sale site they were on and searched the page and didnt find anything. o, and are there powerbands on these bikes? i'm not really shure.
	0

04-16-2008, 03:17 AM	#9
usmc-mustang Join Date: Jan 2008 Location: Seligman, AZ Posts: 107	I have two pushrod motors, and one has had its issues, and it was with the cam. With proper service, both are excellent motors. The pushrod motor is likely to have more torque down low, where the OHC motor is likely to have higher top end HP. The best motor for torque would be a 169 with a pushrod, with its longer rod-angle to stroke ratio. Where the 163 with an OHC would have the best high RPM performance. The sad part is that we are only talking about a few foot lbs of torque, not alot. Speed is going to be determined by alot of factors. GVW, Gear ratio. Never Dyno'd or had an intrest in it. If you look at the motor, it is easy to ID a pushrod vs an OHC. The OHC has a large silver cover on the side of the head that will likely say "OHC". Also, it appears to have 2 large bolts in the top of the valve cover, one in the front, the other in the rear. Want to link the page to the company, might make it easier on the rest of us..
	0

04-16-2008, 12:37 PM	#10
Youpa Join Date: Apr 2008 Location: PA Posts: 19	there arent 2 bolts if i'm looking at it right so its gotta be a pushrod.
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04-16-2008, 11:53 PM	#13
Youpa Join Date: Apr 2008 Location: PA Posts: 19	yup thats the bike this is probly a stupid question (considering i dont know bikes too well) but is there a powerband on that bike? i couldnt find anything about it and if theres not, can 1 be put on?
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04-17-2008, 12:22 AM	#14
driller Join Date: Jul 2007 Location: Lawrence, Ks. Posts: 195	Youpa, not sure what you are asking. The power band is the range of rpm that the engine makes the most power.
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