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Friend just gave me a honda 70cc bike. What engie, need help

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Posted by: Rustler 007---------------------

My friend just gave me a 1997 honda 70cc bike. The motor is bad. I want to put a bigger motor in without any mods. I know nothing about the bike except it needs a new engine.

I found a ZONGSHEN MOTOR 125cc on ebay. Will it fit the bike without mods?


Posted by: Patman---------------------

It should. Maybe you should ask the seller? If they don't know then find another seller.


Posted by: Rustler 007---------------------

i will ask him


Posted by: Rustler 007---------------------

Any more opinions on wether or not a 125cc engine will fit in 1997 honda 70cc


Posted by: Patman---------------------

The exhaust pipe will be too small of a diameter so plan on either a bigger pipe or a smaller displacement engine.


Posted by: Matt90GT---------------------

chinese motors are 99% junk. be warned.

you would have a much better quality bike by either contacting BBR or TwoBrothers to see what kind of bore/stroke kits/motors/parts they offer.

either way it will still be a 70. The xr/crf50s and the KLX110s have a much larger parts selection out there to pitbike them out.


Posted by: Patman---------------------

Quote:
Originally Posted by Matt90GT
chinese motors are 99% junk. be warned.

you would have a much better quality bike by either contacting BBR or TwoBrothers to see what kind of bore/stroke kits/motors/parts they offer.

either way it will still be a 70. The xr/crf50s and the KLX110s have a much larger parts selection out there to pitbike them out.
Really? I would call it a lot more along the lines of you get what you pay for. Guess where a significant portion of the hop up parts from the big name brands come from, that's right the same place alot of the "junk" parts come from. The difference is that parts are built to a price point and sold as such at least in most instances. In others they are just advertised with a bigger budget and nothing more.

Do you know ANYTHING about Lifan? Jialing? I'll say no or you would know Lifan is one of the largest manufacturers of vehicles and engines in China. Jialing happens to be owned by HONDA!

Stick with solving jetting or engine problems with the premix ratio.

Everyone needs to get over the idea that everything from China is junk and realize the cheap stuff is junk but there is reasonable quality product available it just costs more like in the real world. The only people to blame for the junk is the people who buy it expecting it to be more than it is even though they spent a pittance on it. There is no free lunch. Yugo made cars and they came to the states, they were a joke but they were cheap and now are long gone. Hyundai came here with junk, went away and came back with a better quality product and it sells better than many US built vehicles.


Posted by: Matt90GT---------------------

Still dont see the chinese worried about ripping of designs, looks and producing cheap crap. Yes people buying it are to blame, but again be warned on ebay.

Biggest problem with the chinese junk I have seen is wiring harness is a cluster. From one connection to the next it is a different color, then use a unsafe frame, geometery, steering is limited, then will fit a atv tank on a motorcycle and just put enough plastic over it to make it look like it belongs there, their metulargy sucks! output shafts twist in half, they chrome every bolt on the motor to cover up the poor metal they use, and GOOD LUCK finding parts.

There may be that 1 good company out there, but they are far from making any presence in the market today. 10 years from now? only if the country exports as a whole improve or one brands spends some $ into advertising, a parts distribution network, and factory technical support.

Right now all you see is ebay sellers buying crates of this junk for pennies, then trying to make 1000% on each unit, then you find them at shucks autoparts for $299!

Honda just won a lawsuit against Lifan:
http://sify.com/cities/fullstory.php?id=13490867

only got pennies, but just the start of the war I believe here.

Until then we can ride a Mikalon in any japanese or austrian brand we wish:

http://www.motocrossactionmag.com/M...1F7B0C4E1006549


Posted by: Patman---------------------

Every harness on every bike and every parts bag was identical in my past experience.

Most of the aftermarket frames come out of China / Tiawan.

The list will go on and on but the bottom line is that if you go looking for cheap that is exactly what you will find. If you go looking for decent quality that is easy to find as well but it will cost more.

The only people buying junk are those that pay junk prices. The $299 bike at the auto parts store is the same junk just a different location.

The horizontal single engine design is waaay past being ant property of Honda. Lifan settled most any other company would close up and reopen the next day. I don't condone the business preactices but I can't fault them for building to a specific price point wither. Keep in mind the price over there is a significantly larger percentage of a paycheck then it is here.

Honestly I have forgotten more about dealing with China based manufacturers than 99.99% of the people on DRN even know about it.


Posted by: MyckMcClung---------------------

Take stock motor to a shop, have it rebuilt. You will get more money for it later if you decide to get rid of it, the motor can't be that bad, and just because you or the your friends don't have the ability to fix it doesn't mean that a professional mechanic can't.
I would also not recommend trying an engine swap of this sort if you aren't capable of rebuilding a motor as simple as a xr 70


Posted by: Patman---------------------

I find it very amusing that all the people that claim all the China bikes are junk typically compare them to Honda. Any of you twits have a clue about what the old Harley, Norton, BSA, Triumph, etc... guys said about the Honda bikes when they first started hitting our shores? Aparently not because if the Internet was around back then you would see the EXACT SAME COMMENTS

Do I think they are the be all end all? Oh heck no! But until the consumer starts to demand a higher quality product and is willing to pay a higher price for it things will be slow to change. Think about it a tiny bit... anybody remember the SDG Speed Mini? Compare that early China pitbike to what you can get for the same price today (around $2400 USD). Yup a little bit of evolution huh?


Posted by: Patman---------------------

Rustler if you want to make sure you get something that bolts in and is of a good quality check these guys out. http://www.hooperimports.com/dept.aspx?dept_id=02 it will not be nearly as cheap as Ebay but it won't be nearly as sketchy either.


Posted by: Rustler 007---------------------

For the 140cc monster engine.
Will that bolt in. Also, the lifan 125cc motor is about 284 bucks but this is 399. The only thing im going to do is ride around the neighbor hood, nothing over 30mph. Im going trailing maybe 3 times a year. So I wont be pushing the motor at all. So should I just go for the cheaper/less quality.
Like I said im not going to be hard on the engine. Just low speed riding.


also, I am capible of rebuilding motors. I just dontt want the stock 70 when im going to be riding with crf 150's. suzukis 125, 400c atvs and so on. There is no way I can keep up with a 70. So I want a 125 or 140cc to be a little comptiteve. I have a background of dune buggies, rc, and gokart racing.


Posted by: Patman---------------------

even with a 90 to 110 the problem will not be the power but the chassis / syspension / wheel size. A real Lifan will last a long time, a fake one not so much. Keep in mind you will get what you pay for but also your chassis will hold you back.


i


Posted by: TheJunkMan---------------------

Patman is right on point with his comments. As a owner of several "Chinese" pit bikes and pit bike engines, buy far the quality vaires. Choose a reputable engine manufacturer such as Lifan, Zongshen, YX, GPX (Pitster Pro's private brand) The biggest thing you need to worry about now is there are two different "types" of heads now, KLX style and the CRF style, your XR70 will take the CRF obviously if you want to use a CRF70 aftermarket or stock exhaust without an adapter. You also will want to steer away from the clutch on crank engines only for the fact that those engines require the engine to be in neutral to start. All the bottom ends are CRF based in the mounting bolt locations. As far as wiring goes, most crate engines come with everything you need minus a carburetor. Don't listen to the haters, even the "sub-par" engines are pretty good considering the prices. I have an early 125cc Zongshen (2004) in a 1978 CT70 motard project I built, that I have been riding on the street for years. I also have an early SSR125 pit bike that I have heavily modified with a 140cc BBK, 12.5:1 domed piston, Crower G2 cam, 23MM/27MM valve head, 26mm OKO carburetor, stepped exhaust, all on the stock Jialing/GPX 4-up 5 plate clutch bottom end. Long story short, I have been racing this bike for 5 years now and never had a mechanical issue with the engine or transmission.

http://i33.photobucket.com/albums/d...nt/IMG_0217.jpg

http://i33.photobucket.com/albums/d...nt/IMG_0217.jpg

The XR70 is a good starting platform for a midsized pit bike if that is what you intend to build.

Here is another outlet for different Quality engines. I have used this company several times with no problems. They also take technical type questions.

http://www.tboltusa.com/store/engines-c-114.html



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