New Bike

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TrailPunisher

Member
E-mail ebay seller coloradokiteski for a replacement Chinese speedometer head.
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I have bought several items from him and he is a reliable e-bay seller
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He also has 86cc electric start engine kits with either Auto or Manual clutch that come with a complete from head to toe electrical kit for a Re-pop bike for around $325 + shipping.
It even has a keyd ignition switch, headlight , tailight assembly,locking gas cap,4 turnsignals,horn,handlebar controld with the buttons,all wiring and parts needed to turn a bike in to a 12 volt machine, everything is included in these kits.
I use my wiring kit for spare parts for my bikes.
 
TrailRyd3r

TrailRyd3r

Member
moko said:
nice bike trailryd3r.......i'm thinking i'll get the 110cc motor......by the way,how fast was your 90cc motor? Also....do you know anywhere i can get some rear pegs for this type of swingarm.
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Thanks, my 90cc went almost 45, it had a 16/44 setup, it was a torque monster.First gear was almost useless.

We mainly just deal in whole bikes and complete engines, we don't stock all the little parts, just not enough demand. We just get and keep the stuff we need:D
But if you need a motor or a new bike, let me know.:) I don't know where to get new pegs at.
 
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69ST

Well-Known Member
originally posted by surf7
..."getting it in to neutral is kind of hard when the bike is stopped (that’s any bike)"...
Click to expand...

Crude transmission operation was my main gripe when I ran Chinese engines. Some are better than others and the shifting tends to improve somewhat after the first 500 miles, but the ZS108 I last ran was a bastard to get into neutral once it was up to operating temperature, shift quality was brittle and fourth gear was unbelieveably noisy above 40-45mph. Many of the smaller engines (90cc & below) have enough parts interchangeability that Honda or aftermarket Japanese tranny parts can be swapped-in, curing any transmission deficiencies. The 110 & larger motors don't have that kind of parts availability, thus you're locked into "run what ya brung and hope ya brung enough" if you're after a cheap 110cc-up motor. Honda gearboxes and I'd wager the aftermarket Japanese trannies, as well, don't have these problems. They just don't come cheap.
 
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69ST

Well-Known Member
Trailpunisher's results point out some interesting details.

With the exception of the 48cc bike, all of the speeds are about what I'd expect. But notice the sprocket combos used. These indicate wide variations in transmission gearing between the different engines. That overacheiving L48 is pulling through a 14/36 combo, while the Z108 did best with a 14/37 (as with the Z124). I ran a Z108 with 17/33 sprockets, which yielded 6.76mph/1000rpm and the bike topped-out at 57/58mph on the flat, exactly matching the 8500rpm hp peak of that specific engine. If the transmission ratios were the same, then top rpm should be 24% greater (10,700)...not possible with the cam used, which had a 9600rpm upper limit. Obviously, the engines were spec'd differently from the manufacturer. If you know the rpm at which peak power is reached, engine redline and overall gearing through the transmission, then you can science-out the gearing without a lot of trial and error. Short of that info, a tachometer is the next best thing. This is what I was trying to point out in another thread.
 
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TrailPunisher

Member
I have three 48cc engines, they all have the E-22 head and 19mm carb on them, I am surprised at how well they run.
The Emoto/Lifan 97cc engine also has an E-22 head and is a bit quicker than the Z-108 engine.
If I were to change my countershaft sprocket from 14 to 16 or 17 tooth I should pick up some top speed and lose some low end I believe.
I think my speedo may read a couple MPH slow, I pull away from traffic and it reads 55mph.
 
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69ST

Well-Known Member
No idea how your Z108 compares to the L97. I would expect the Z108 to have the edge, at least in torque output, but there are multiple versions of the Z108. The best of the bunch has the clutch mounted on the secondary (trans) input shaft and, as far as I am aware, isn't sold by any US vendor.

Unless you're running a really tall tire, like a 120/90-10, chances are that the speedo actually reads fast.
 
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TrailPunisher

Member
Had my girlfriend follow me in her car and hold a steady 55mph while I was on the Black bike. I steadily pulled away from her and she said about 59-60 mph when she caught back up and followed me steady on a straight flat section of road.
On the slight downhill got up to 65-67 mph.
The Red one I have the replacement MPH speedo is out of whack, reads ok untill 40 then the needle moves back and forth before finally settling down at a steady speed.
I did all my speed runs on it when it still had the metric speedo in it.
I have another speedo head to install on it.
My mini-chopper and Ninja bikes have electronic speedos, I have not had a change to ride them and test their accuracy yet.
 
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69ST

Well-Known Member
Those actual speeds sound about right. Having a speedo that reads slow is a bit unusual. If you ride this bike mostly on the road, you might benefit from knowing your actual speed (before the black & white tax collectors show up in your rearview mirror :eek: ) A speedo repair shop can calibrate a speedo head for about $50; the Chinese speedos snap-together and are easily taken apart, that'll save you some bucks & headaches. Some riders use LCD bicyle speedometers that can be user-calibrated once you know the rolling radius of the front wheel (paint spot on the tire, measure the distance after two wheel revolutions).

Electronic speedos, such as the aforementioned bicycle unit, are light-years ahead of the old analog speedometers, especially where the cheaper ones are concerned. Once calibrated, they don't change with time or temperature. That's not to say that all are correctly calibrated, as-installed on a bike, from the factory, just that they give consistent, stable, readings. You'd probably get better accuracy if you can set the calibration yourself because you'll take the time to get it dialed-in.
 
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moko

Member
Hey trail punisher,what kind of 125 motor do you have in your trail 70 clone and is it a manual or auto clutch.And is it kick start only.Also what kind of oil is everybody using.
 
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TrailPunisher

Member
MOKO , I have a Zongshen 125cc engine with a 4 speed manual clutch on the CT clone and I just installed another one on a CRF-70 dirtbike.
I used regular 10w-30 oil to break in the engine and now have Mobil 1 5W-50 synthetic in it.
http://pg.photos.yahoo.com/ph/punisherjbracing/detail?.dir=e2c4&.dnm=99b9re2.jpg&.src=ph
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http://pg.photos.yahoo.com/ph/punisherjbracing/detail?.dir=e2c4&.dnm=e070re2.jpg&.src=ph

http://pg.photos.yahoo.com/ph/punisherjbracing/detail?.dir=e26e&.dnm=51efre2.jpg&.src=ph
 
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moko

Member
that looks real nice. :yellow70: how did you put the clutch lever on,did you just mount it beside the left handlebar assembly and where did you buy that engine.
 
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TrailPunisher

Member
The clutch lever and cable comes with the engine kit. It takes all of 30 seconds to mount it on the handlebar on the XR-70. My Clone black CT clone was a 4 speed manual model when i got it. My Chinese clone bike that came as an automatic did not have a left brake lever. I would use the left brake lever for a clutch lever if I had an original Honda bike.
 
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TrailPunisher

Member
The pipe came from an e-bay seller Mrminitrail. I have 3 of them, they are off pitbikes and they are extremely loud. when I got mine they were $75-85 + shipping but now everybody is selling them and sometimes they sell for a little less than that.
The skidplates on the XR bikes also came from him and bolt up directly.
They will fit on the CT-70 also. mine were $30 and $35 + shipping but they are bringing more $$$ now.
I got my engines from E-ay seller discovery2827. $325 + shipping will get you one to your door with-in a weeks time if you make them an offer ( they raised shipping to $64 now)
My 124 and 108cc engines are kick start only, I knew they would fit .There are other sellers selling them with electric start , i didnt know if they would fit because the Zongshen engines are bigger as it is and I felt that it was too risky to buy from them instead of an established E-bay seller I know is reliable .
 
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moko

Member
I have been thinking of which engine to get and i think i will get the lifan 125 manual clutch from dratv,since it will be street legal hopefully real soon and i weigh 205lbs.,i dont want to be holding up cars because i cant go fast enough.
 
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