Engine help

[goshine201]

Hey guys,i am building a mini bike and cant decide what engine to go with. I want lots of speed and power for this one so i have narrowed it down to two engine but cant decide which one to go with.

http://www.ebay.ca/itm/DuroMax-16-H...ltDomain_0&hash=item2ebc9a25be#ht_4993wt_1270

http://www.ebay.com/itm/LIFAN-200CC...es&hash=item2a181d706c&vxp=mtr#ht_9668wt_1037

The Lifan claims to be the same HP but 8000rpms instead of 3600rpm like the duromax. I pretty much know nothing about how to hook up the lifan but defiantly willing to learn. I would greatly appreciate your help. Also if anyone can suggest a better engine that would be great, price limit about 500 dollars.

Thank you.

 

[Jcotz]

The lifan will have a 5 speed transmission, which is very nice. It is important to know does the lifan come with a carb? Because if it does not, then you will need to get that, an air filter, a gas tank (if you don't already have one, and a header. It really depends on what you are looking for, because if you want something just to buy and use right out of the box, then the duromax is good, but if you want something that is a little more unique, but does not come "ready to use out of the box" then the lifan is better. I can't honestly say which one will perform better, someone else may know. The last thins is that most dirtbike/motorcycle engines have a "primary reduction" so the final drive sprocket is not going to be 8000 rpms. Hope this helped.

 

[goshine201]

As far as the rpms go, how much should i expect? The lifan seems like a better choice, even though it needs more work. But working on your project is half the fun of this hobby anyway. My only problem is that i am new to these sort of engines and don't know how to hook them up, does anyone know of a good read for a beginner? My main focus for this is speed so the lifan seems better. So far i cant find a better engine that will go faster, maybe i should look for used motorcycle engines. Thank you for the reply

 

[Jake.B]

Wrecked dirtbikes and quads usually have good engines, there are alot of dirtbikes and quad engines seperated from the frame. They arnt cheap but for 500 you could snag one easy. They usually have 520 chain and sprockets. You would mostlikly only need a rear sprocket and chain.

 

[Jcotz]

The primary reduction is probably 3:1, but don't quote me on that. Hooking it up shouldn't be too hard, and if you buy a used motorcycle engine, then the person will probably sell you all you need with it.

 

[Jake.B]

Yeah i checked craigslist today in my area and saw some great engine deals and a fewngood lifan deals too. Check it out your bound to fine one.

 

[goshine201]

My problem is that im not in the US so craigslist isnt really an option, ebay seems like my best choice. I was searching today and found these:
http://www.ebay.com/itm/250cc-Zongs..._Accessories&hash=item35bac8fe7e#ht_679wt_952

http://www.ebay.com/itm/250cc-Zongs...ries&hash=item35bad8c3e4&vxp=mtr#ht_483wt_976

Both top out at 8500 rpm and are made by a higher quality company, what do you guys think?