Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Bicycle Motor > 2 Stroke Bicycle Engines & Kits

2 Stroke Bicycle Engines & Kits 2 stroke engine kits need careful installation and setup, find out how from our professionals here!

Reply
 
Thread Tools Display Modes
  #1  
Old 11-13-2008, 03:22 PM
paul's Avatar
paul paul is offline
Administrator
 
Join Date: Dec 2007
Location: Portage, MI
Posts: 5,584
Default are 2 stroke engine kits the same?

absolutely not! i have been researching this to try to find the answer. their is numerous company's producing the motors in china. they may look the same but they are not. what made me look into this is my first motor was the cheapest i could find and it had bushing bearings and wanted to replace them with roller bearings but they would not fit. the similarities in the motors is basics like carburetors and exhaust mounts are the same. however their is like 4 different styles and lengths of exhaust available of different kits i have found. same with cdi's. they may look the same but they are different depending on who manufactures them. some have less winding and less windings mean less power. the ohms on the cdi's can range from 257 ohms to 353 ohms of course the 353 ohm cdi is the better of them. same with carburetors. their is 2 different size slides and one will not work on the other. the bigger one is 1.5 mm larger. spark plug wires i know this from my kit. it was a piece of junk and it was like having a new motor when i replaced it. the engine itself some use 6mm cylinder studs, others use 8mm, Counter shaft sprockets are different. Some have larger cooling fins, and more. Here is what items I have found that are similar and can work with most of the other engines. Side covers, Magnetos, CDI's, Spark Plugs, Carbs. kinda like some car parts are interchangeable or AA batteries all look the same but they sure the heck are not. however things like pistons, rings, bushings ect are not interchangebable. so to wrap this up they may look the same from the outside but inside these engines are different and each manufacture in china has thier own inhouse inspections. take your time when you buy an engine and make sure it has a good cdi, wires, bearings ect. hope this helps clear things up a little
Reply With Quote
  #2  
Old 11-13-2008, 03:35 PM
thatsdax thatsdax is offline
Motorized Bicycle Elite Member
 
Join Date: Feb 2008
Posts: 867
Default Re: are 2 stroke engine kits the same?

you got it. What you are saying is true. I do not know how to convey it any better that what you have done. . I am not the best at those things. But I can tell you this Paul. You understand what the deal is with these engines and how they differ. And they are not the same. Only if they come from the same factory will they be the same. Thanks again.. Sincerely.. Duane...
__________________
http://vorderbuehne.de/9a553

Last edited by thatsdax; 11-13-2008 at 04:25 PM.
Reply With Quote
  #3  
Old 12-06-2009, 06:02 PM
xlite xlite is offline
Motorized Bicycle Elite Member
 
Join Date: Jun 2009
Location: ny,ny
Posts: 736
Default Re: are 2 stroke engine kits the same?

I agree too. Most who say they are all the same are talking through their hat. You really find out when trying to get replacement part after a couple years.

In fact it's difficult to get similar motors from the same vendor!
Reply With Quote
  #4  
Old 12-06-2009, 09:13 PM
Motor Boys's Avatar
Motor Boys Motor Boys is offline
Motorized Bicycle Elite Member
 
Join Date: Nov 2009
Location: Cambridge
Posts: 179
Default Re: are 2 stroke engine kits the same?

All very good points Paul, and all very true, a buyer should do there homework.
__________________
Great Deals, On Great Engines and Parts www.80ccmotorboys.com
Reply With Quote
  #5  
Old 02-06-2010, 01:05 AM
yojimbo yojimbo is offline
Motorized Bicycle Newbie
 
Join Date: Feb 2010
Location: Rock Island, Il
Posts: 5
Default Re: are 2 stroke engine kits the same?

where can i find quality kits UNDER 49cc's? i live in il and they just passed a law limiting the size and hp right when i was about to open shop!
Reply With Quote
  #6  
Old 02-06-2010, 03:51 PM
Nougat Nougat is offline
Motorized Bicycle Elite Member
 
Join Date: Nov 2009
Location: Montgomery, IL
Posts: 1,332
Default Re: are 2 stroke engine kits the same?

yojimbo, many of the kits I've seen advertised rate the "small" engine at 48cc. My RAW kit is marked 48cc.

Also, the only IL state law I'm aware of actually legalizes "low-speed gas bicycles" to 1HP, but says nothing about displacement:

Illinois General Assembly - Full Text of SB0236
Reply With Quote
  #7  
Old 02-09-2010, 10:58 PM
Allen_Wrench's Avatar
Allen_Wrench Allen_Wrench is offline
Resident Mad Scientist
 
Join Date: Feb 2010
Location: Indianapolis
Posts: 2,782
Default Re: are 2 stroke engine kits the same?

My research tells me much the same as what is stated above. You have to learn a little about the engine before you buy, read what others say. I feel safe with ThatsDax for that reason. (...And I am not affiliated, nor have I been paid or pressured to endorse.)
Reply With Quote
  #8  
Old 03-06-2010, 07:39 PM
analogtom's Avatar
analogtom analogtom is offline
Motorized Bicycle Newbie
 
Join Date: Mar 2010
Location: Destin FL
Posts: 12
Default Re: are 2 stroke engine kits the same?

What is the highest quality engine being sold? With the highest quality parts etc...

What would you buy now to build a bike with?

Or is there a Best Company that can be trusted ?

I like the simplicity of the motors but am looking for a quality motor for my next build, I am looking at 4 cycle engines due to quality of the brands (ie honda.... )
Reply With Quote
  #9  
Old 04-15-2010, 01:11 PM
stuartracing's Avatar
stuartracing stuartracing is offline
Motorized Bicycle Elite Member
 
Join Date: Dec 2008
Location: Gainesville FL.
Posts: 488
Default Re: are 2 stroke engine kits the same?

Ok I have 2 motors....One is the bushing type rod bearing motor(small end)....And the other is cage type bearing....Piston pin location is way different too....I bought a spare piston,but ony good for the cage bearing motor because of the pin location on the piston....
So would the billet head work on either of these 2 motors or would you need to use another head gasket on it????
Paul.....
__________________
Life in the Fast Lane......
If your living on the edge , you`re taking up too much space....
Reply With Quote
  #10  
Old 05-01-2010, 01:09 AM
wildemere wildemere is offline
Motorized Bicycle Elite Member
 
Join Date: Feb 2008
Location: Newcastle
Posts: 269
Default Re: are 2 stroke engine kits the same?

Bushing motors use a 11mm wrist pin, Bearing motors are 10mm.

The rod length is also different.

Parts are not easily interchangable between the 2 setups.

Bushing motors seem to run faster though.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 09:30 AM.


Sponsors

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
MotorBicycling.com