Which mods is the best for a Phantom 85

[DAMIEN1307]

And I'm supposed to be the old guy here???...lol...My memory still works...lol...lol.

 

[Wrench]

We all know what "assume" means, don't we boys and girls...lol...lol.

When buying a used BMW it's safe to "assume" that the turn signals have never been used

 

[robe]

When buying a used BMW it's safe to "assume" that the turn signals have never been used

Cadillac's and Tesla's fit in that category as well.
Drives me crazy people turning left across traffic who are too cool to signal.
I was taught to signal all the time even if there is no one around, just to reinforce the habit.

 

[Wrench]

I was taught to signal all the time even if there is no one around, just to reinforce the habit.

Change the old Dot 3 blinker Fluid to new synthetic DOT 5 and your blinkers will work better and last longer
Don't forget to top off the blinker fluid every month

 

[DAMIEN1307]

Change the old Dot 3 blinker Fluid to new synthetic DOT 5 and your blinkers will work better and last longer
Don't forget to top off the blinker fluid every month

Whilst your at it, don't forget to lube up those muffler bearings really good too...lol...lol.

 

[Chainlube]

Change the old Dot 3 blinker Fluid to new synthetic DOT 5 and your blinkers will work better and last longer
Don't forget to top off the blinker fluid every month

You don't gotta fill it every month, you should check it though.

 

[cloakedvillain]

Early steam locomotives used kerosene head lights. How's that for blinker fluid?

 

[robe]

Deluxe motorcycles back in the day had an acetylene bottle to power the headlight.
The MC size bottle is still used today. I have one that I bought used, wish I would have found a "B" size instead because the fill on a MC is more than a B with half the gas.

Prest-O-Lite and Gas Powered Head Lamps - Harley Davidson Forums

When looking at photographs of old Harley-Davidson motorcycles (I’m talking the teens or older), you’ve probably noticed that a lot of them have a cylinder mounted to the frame or handlebars, about the size of a kitchen fire extinguisher. You may have even thought that this was a fire...

www.hdforums.com

 

[insane engines]

The V4 would be the best option to get whenever it does come out.

Out of the box te Phantom makes 5hp at 9000rpm, and 5.5ft-lbs at 3500rpm. This makes it capable of at least a 45mph/72kph top speed, with some achieving 50mph/80kph. The torque peak being so low also means the engine can power a bike off the line with basically zero pedal assistance.

That power and torque is just below the limits of what the standard style clutch on these little engines can handle.

On my Phantom I did a bunch of mild performance improvements to the tuning of the engine. I removed one of the base gaskets and decked the jug base and cases to level them and set my squish gap to .9mm. I swapped out the factory piston because they aren't very good and installed a Meteor brand piston for a Stihl 046 - this also helped set the squish gap as it's a bit taller on the crown. I then port matched the intake and opened it up and blended it all together leaving it rough from the double cut burr I used. I also smoothed and roughed the lower transfer ports and deburred the casting edges from the transfer ports on the piston. I also reshaped the exhaust port to be more rounded and removed a little material to add a couple degrees of exhaust port duration and improve the blowdown.

I also balanced and trued the crankshaft, which I highly recommend doing if you want to push this engine and have the bearings and seals last.

With the original Bofeng carburetor that comes with the Phantom my bike was able to move my very large body to a top speed of 54mph/87kph. I am 193cm tall and weigh 118kg, just for reference of how large I am. That's about 10,500rpm with the setup I had on my bike at the time. I estimate my engine was/is making around 7hp. I also started to go through clutch pads more frequently, meaning I was right on the ragged edge of the clutches capability. I put another turn and a half on the preload of the main clutch spring to help reduce the mild slipping causing that wear which did help.


One word of Warning. The Phantom runs hot, and doing the work I did makes it run a bit hotter, and they are well known to overheat and soft seize when pushed hard for too long. This is made way worse if you don't run the recommended oil mix ratios. I ran mine at 20:1 from break-in and beyond, and after my first 2 gallons I switched to the VP Racing synthetic 2 stroke I like to run, but stayed at the same mix ratio. I also upped my main jet size to match my changes and make sure the engine was always a bit on the rich side to help keep the piston cool so it would be less prone to soft siezure.

There are ways around this, such as a 2 piece head and jug with an aftermarket head.

Id like to know how the meteror piston works in the phantom engine when I just looked them up.To see there not a windowed piston!So out with the reeds and what will that get you for better performance??

 

[Gordy]

Id like to know how the meteror piston works in the phantom engine when I just looked them up.To see there not a windowed piston!So out with the reeds and what will that get you for better performance??

The phantom gains about half hp without the reed.