Increase performance? - Page 2

SamM · 05-16-2007, 06:00 PM

For the money needed to get an extra 50cc of displacement and all the associated headaches, that are surely going to crop up, why not just do an engine swap? Purchase one of the 250cc dirtbikes and swap the engine into the streetbike. They've already done the hard part for you. There are numerous ways this could be done. Buying the dirtbike and parting out the extras. Swap engines and sell the extra bike. Buy the 250cc engine outright for the swap, etc... I'd love to have one of the newer CDI OHC engines in my Viva anyway. Why not do the entire bike? I may just completely strip the bike down and rebuild it. The frame needs some attention anyway, why not strengthen it with better gussets instead of the cheap stamped steel gussets. My frame could use some work. This winter, all bets are off!

Why do people constantly think these bikes are not worth modifying? Ok, if you only pay 1k for it... and then you spend... nevermind!

Maybe I'm just...

katoranger · 05-16-2007, 08:37 PM

I prefer Sam's response. If/when i kill the 200 OHV then it will be time to swap in a 250 OHC. The jugs may be a direct swap. I have a 200 yamaha that will take the 225-230 jug as a direct swap.

The 200's can be had for about $350-400 on ebay right now. I am sure the 250 will be available soon.

Allen

TeamCheap · 05-17-2007, 02:47 AM

I havnt seen the 250cc single engines for sale yet but yeah I agree they will be along sooner or later.

I had thought "maybe I could stuff one of those 250cc twins in mine" but no, nope I just didnt think I could do it.

I think I'm going to try to get pipe and rejet mine just to see how that goes even though it is pretty good right now.
Actually I feel these bikes NEED some modding the frames are weak.The stock engine vibrates alot and the plastic is a little to brittle for me.

But for the money I have been having fun both riding and modding it so I'm happy.

When will these be around here?
http://cinhaigroup.ecvv.com/chinasup...ike-300cc.html
http://www.ecvv.com/offerdetail/I971445.html
http://www.ecvv.com/offerdetail/I830954.html

30-Arider · 05-17-2007, 11:04 AM

Quote:

Originally Posted by SamM

For the money needed to get an extra 50cc of displacement and all the associated headaches, that are surely going to crop up, why not just do an engine swap? Purchase one of the 250cc dirtbikes and swap the engine into the streetbike. They've already done the hard part for you. There are numerous ways this could be done. Buying the dirtbike and parting out the extras. Swap engines and sell the extra bike. Buy the 250cc engine outright for the swap, etc... I'd love to have one of the newer CDI OHC engines in my Viva anyway. Why not do the entire bike? I may just completely strip the bike down and rebuild it. The frame needs some attention anyway, why not strengthen it with better gussets instead of the cheap stamped steel gussets. My frame could use some work. This winter, all bets are off!

Why do people constantly think these bikes are not worth modifying? Ok, if you only pay 1k for it... and then you spend... nevermind!

Maybe I'm just...

GREAT IDEA! Id be very interested to find out what the crankshaft and connecting rod on the 250 is compared to the 200 motors. Anyone know what the bore and stroke is on the 250 motor compared to the 200? Is it just a larger bore or did they inc rease the stroke?

red2003 · 05-30-2007, 03:23 PM

I believe the bore AND stroke are bigger. Any word on the sleeve???

czowner · 05-31-2007, 02:53 AM

Had a rake around the internet and came up with these specs for my Hongdou 250GY. After looking on the Honda CRF230 forums (which is basically what the engine is) there is very little scope for boring out, 10cc max, as the motor is a bored out 200.

Bore x Stroke (mm) 65.5x66.2
Piston Displacement 223cc
Compression Ratio 9.0 : 1
Maximum Power (kw/r/min) 14/7500
Maximum Torque (N.m./rpm) 17/6000

Jonathan.

30-Arider · 05-31-2007, 12:01 PM

Quote:

Originally Posted by red2003

I believe the bore AND stroke are bigger. Any word on the sleeve???

got a call out to
Powroll. LA sleeve said they didnt have one, but did manufacture multiple sleeves for Powroll back in the 80's and 90's ....ranging from 200-275cc for XR200's and 250's.

knothead · 06-01-2007, 05:58 PM

Why not grab a sawzall and a welder and shoehorn a Honda CR500 engine in there? That really would be a wolf in sheeps clothing... I think they had something like 45 hp...

molypod · 07-10-2007, 12:20 PM

Before buying my Lifan I inquired about buying this bike
http://www.buysell.com/root/detail/B..._Zongshen.aspx
then adding a Dualsport Kits getting it inspected and licensed since I could buy it locally ( chilliwack)
I was getting into more money than I could convince the wife to spend and ended up getting the GY-5. Now I wonder about dropping in the 250 engine into the GY instead of trying to get a big-bore kit. or selling the Lifan and buying the Lifan style 250

the specs on the 250 are located http://x-rage.ca/DirtBikes.html choose anyone of the 250 dirtbikes

IronFist · 07-10-2007, 02:12 PM

I'd love to stick a 200 motor in my 150cc frame. I'm a little broke and new for that yet. :( I'm telling people to give cash this year for christmas. (bike parts)

Jim · 07-10-2007, 05:18 PM

I had mine up to 9000RPM or maybe a bit higher on the highway

05-16-2007, 06:00 PM	#16
SamM Join Date: Feb 2007 Location: West Virginia Posts: 1,194	For the money needed to get an extra 50cc of displacement and all the associated headaches, that are surely going to crop up, why not just do an engine swap? Purchase one of the 250cc dirtbikes and swap the engine into the streetbike. They've already done the hard part for you. There are numerous ways this could be done. Buying the dirtbike and parting out the extras. Swap engines and sell the extra bike. Buy the 250cc engine outright for the swap, etc... I'd love to have one of the newer CDI OHC engines in my Viva anyway. Why not do the entire bike? I may just completely strip the bike down and rebuild it. The frame needs some attention anyway, why not strengthen it with better gussets instead of the cheap stamped steel gussets. My frame could use some work. This winter, all bets are off! Why do people constantly think these bikes are not worth modifying? Ok, if you only pay 1k for it... and then you spend... nevermind! Maybe I'm just... __________________ 2013 Jeep Wrangler Sahara MOAB 2005 BMW E53 X5 2011 Schutt Industries LTT-HC LQG trailer 2017 Coleman CT200U 1978 Yamaha SR500E 1979 Yamaha XS650 Special II
	0

05-30-2007, 03:23 PM	#20
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,251	I believe the bore AND stroke are bigger. Any word on the sleeve??? __________________ First Chinabike: 2006 Roketa RSX200E Current Chinabikes: 2023 Titan DLX & 2022 Lifan KP Mini w/ 210cc BRT kit, 22 RWHP!
	0

05-31-2007, 02:53 AM	#21
czowner Join Date: Sep 2006 Location: North East England Posts: 313	250 SPECS.. Had a rake around the internet and came up with these specs for my Hongdou 250GY. After looking on the Honda CRF230 forums (which is basically what the engine is) there is very little scope for boring out, 10cc max, as the motor is a bored out 200. Bore x Stroke (mm) 65.5x66.2 Piston Displacement 223cc Compression Ratio 9.0 : 1 Maximum Power (kw/r/min) 14/7500 Maximum Torque (N.m./rpm) 17/6000 Jonathan.
	0

05-16-2007, 08:37 PM	#17
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I prefer Sam's response. If/when i kill the 200 OHV then it will be time to swap in a 250 OHC. The jugs may be a direct swap. I have a 200 yamaha that will take the 225-230 jug as a direct swap. The 200's can be had for about $350-400 on ebay right now. I am sure the 250 will be available soon. Allen
	0

05-17-2007, 02:47 AM	#18
TeamCheap Join Date: Jun 2006 Location: directly under the earths sun............NOW Posts: 2,302	I havnt seen the 250cc single engines for sale yet but yeah I agree they will be along sooner or later. I had thought "maybe I could stuff one of those 250cc twins in mine" but no, nope I just didnt think I could do it. I think I'm going to try to get pipe and rejet mine just to see how that goes even though it is pretty good right now. Actually I feel these bikes NEED some modding the frames are weak.The stock engine vibrates alot and the plastic is a little to brittle for me. But for the money I have been having fun both riding and modding it so I'm happy. When will these be around here? http://cinhaigroup.ecvv.com/chinasup...ike-300cc.html http://www.ecvv.com/offerdetail/I971445.html http://www.ecvv.com/offerdetail/I830954.html
	0

06-01-2007, 05:58 PM	#23
knothead Join Date: May 2007 Location: In the land of the busted up ricebowl Posts: 815	Why not grab a sawzall and a welder and shoehorn a Honda CR500 engine in there? That really would be a wolf in sheeps clothing... I think they had something like 45 hp...
	0

07-10-2007, 12:20 PM	#24
molypod Join Date: Oct 2006 Location: British Columbia, Canada Posts: 223	Before buying my Lifan I inquired about buying this bike http://www.buysell.com/root/detail/B..._Zongshen.aspx then adding a Dualsport Kits getting it inspected and licensed since I could buy it locally ( chilliwack) I was getting into more money than I could convince the wife to spend and ended up getting the GY-5. Now I wonder about dropping in the 250 engine into the GY instead of trying to get a big-bore kit. or selling the Lifan and buying the Lifan style 250 the specs on the 250 are located http://x-rage.ca/DirtBikes.html choose anyone of the 250 dirtbikes
	0

07-10-2007, 02:12 PM	#25
IronFist Join Date: Apr 2007 Location: Toronto Ontario Canada Posts: 2,585	I'd love to stick a 200 motor in my 150cc frame. I'm a little broke and new for that yet. :( I'm telling people to give cash this year for christmas. (bike parts)
	0

07-10-2007, 05:18 PM	#26
Jim Join Date: Mar 2007 Location: Abbotsford, BC, Canada Posts: 4,880	I had mine up to 9000RPM or maybe a bit higher on the highway
	0