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willardnigma · 04-19-2022, 03:59 PM

From my experience (I've owned the phantom 85 and all of the little 2 strokes.)
for 2 years my main mode of transportation was a motorized bike. It's what I was riding when I got the call about my dad, motivating me to rush over to the next county on hilly backroads.

All of those engines are from the same factory. The phantom 85 I bought was horrible. The head, piston and crankshaft replacement to go from the 66cc to the 85cc creates a ton of problems that ruin any longevity of the bike.

REPLACE ALL BOLTS for mounting the engine and for the intake and exhaust with good ones bought locally. as much as these vibrate I've seen the exhaust and intake bolts shear right off. I've heard of the rear sprocket bolts doing the same, but haven't experienced that myself. You know the typical chinesium quality doesn't pair well with a high vibration 2 stroke.

All of the quality from any of the sellers is hit or miss. The biggest way to get the best performance from my opinion is shorten the intake, get a high compression head. Polish your ports (lots of deburring from the casting on the jug) Windowed piston and reed valve attachment.

Being a china bike rider you know all to well about jetting the carb (hard to find jets for the stock carbs, best finding an aftermarket that fits)

As far as exhaust upgrade go, they're hit or miss. It's all about the rpm range you're running at. The stock one does well if you know how to enlarge the opening just a smidge. The ones referred to as "banana pipes" are just snake oil and sound a bit louder, but aren't truly tuned to give any performance.

All of these kits are way too overpriced vs buying the cheapo kit and finding the aftermarket parts to slap on yourself.

If you want I can link everything that was on my bike that's still in use today since 2018
(the new owner has only had to replace the chain and air filter)

And just like any other china bike
LOTS OF LOC TITE is a must.

Base motor kit

I recommend this High compression head, as the other design are lacking in cooling. You will notice a difference compared to the stock one

Windowed Piston. DO NOT get this upgrade if you don't get the reed valve, or you will lose a lot of performance

Reed Valve (wont get much out of this without having a windowed piston

And the final part, bike wheels with the mounts for brake rotors tend to fit the rear sprocket just fine. This is a must if you want any longevity as pushing the engine harder than stock can rip right through your spokes. Hell even a stock engine can do it if you get one thing out of alignment.

04-19-2022, 03:59 PM	#10
willardnigma Join Date: Apr 2020 Location: Ohio Posts: 52	From my experience (I've owned the phantom 85 and all of the little 2 strokes.) for 2 years my main mode of transportation was a motorized bike. It's what I was riding when I got the call about my dad, motivating me to rush over to the next county on hilly backroads. All of those engines are from the same factory. The phantom 85 I bought was horrible. The head, piston and crankshaft replacement to go from the 66cc to the 85cc creates a ton of problems that ruin any longevity of the bike. REPLACE ALL BOLTS for mounting the engine and for the intake and exhaust with good ones bought locally. as much as these vibrate I've seen the exhaust and intake bolts shear right off. I've heard of the rear sprocket bolts doing the same, but haven't experienced that myself. You know the typical chinesium quality doesn't pair well with a high vibration 2 stroke. All of the quality from any of the sellers is hit or miss. The biggest way to get the best performance from my opinion is shorten the intake, get a high compression head. Polish your ports (lots of deburring from the casting on the jug) Windowed piston and reed valve attachment. Being a china bike rider you know all to well about jetting the carb (hard to find jets for the stock carbs, best finding an aftermarket that fits) As far as exhaust upgrade go, they're hit or miss. It's all about the rpm range you're running at. The stock one does well if you know how to enlarge the opening just a smidge. The ones referred to as "banana pipes" are just snake oil and sound a bit louder, but aren't truly tuned to give any performance. All of these kits are way too overpriced vs buying the cheapo kit and finding the aftermarket parts to slap on yourself. If you want I can link everything that was on my bike that's still in use today since 2018 (the new owner has only had to replace the chain and air filter) And just like any other china bike LOTS OF LOC TITE is a must. Base motor kit I recommend this High compression head, as the other design are lacking in cooling. You will notice a difference compared to the stock one Windowed Piston. DO NOT get this upgrade if you don't get the reed valve, or you will lose a lot of performance Reed Valve (wont get much out of this without having a windowed piston And the final part, bike wheels with the mounts for brake rotors tend to fit the rear sprocket just fine. This is a must if you want any longevity as pushing the engine harder than stock can rip right through your spokes. Hell even a stock engine can do it if you get one thing out of alignment. Last edited by willardnigma; 04-19-2022 at 04:19 PM. Reason: updated with some link and important info i left out
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