Tear-Down: Phantom 85 with MS-460 Piston

Рет қаралды 2,251

Жыл бұрын

In this video, I tear down the seized Phantom 85 with the swapped MS-460 piston. We found out that the top piston ring got hot and expanded, got snagged on the exhaust port, and busted the top edge of the piston.
Link to auction benefiting the American Red Cross below:
www.ebay.com/itm/255773357611

Пікірлер: 36

@rogerstafford-wakeinc.2088 Жыл бұрын

If your locking up when you try to start its the bell housing in the clutch. Back the flower nut off several spaces. The pads have finished seating and the clutch spring has internally shifted. Godspeed

@Popeyes66 Жыл бұрын

Very humane person for your wonderful gesture to Floridians .

@pulsar2121 Жыл бұрын

Thank you!

@grendelsgarage9723 Жыл бұрын

Oooooo that was crazy! Good video my man!

@fabianse Жыл бұрын

The phantom 85 is definitely a fragile engine and needs to be rode a specific way. I learned from experience cause all mine were blowing up but eventually I was able to make mine last for 6+ months

@joshrichards2491 Жыл бұрын

Yall got to be running the phantom to lean mine still has the original piston almost a year later

@rogerstafford-wakeinc.2088 Жыл бұрын

Just pull the head bolts and turn the jug sideways . If its a old seizure it will bind and come out. If its a soft seize it should do it were your trying on the main drive gear.

@keithboggs1783 Жыл бұрын

Hay man I think your aution idea is good. Hope it works out.Good videos.

@pulsar2121 Жыл бұрын

Thank you!

@stevenharkreader65 Жыл бұрын

There is no cure for the P85 cylinder.

@christianhunt7382 Жыл бұрын

You have one?

@hksjoshua Жыл бұрын

Oko carb with power jet running on e85 will cure the overheating issues.

@boosted. Жыл бұрын

? Has anyone taken a new one apart and checked the ring end gap ? These cylinders were designed for chainsaws which have forced air cooling, and are designed to pull a cutting chain with minimal effort for short periods at a time. Just driving at speed does not guarantee engine cooling with air flow dynamics in a bicycle frame..... those cylinders, pistons and rings, where designed to run with forced air cooling with shrouds that means the cylinders are cooled from all sides not just in the Front of a bicycle That may not be getting any airflow . A kit like this needs a cylinder and head like the old school air cooled dirt bikes ....

@pulsar2121 Жыл бұрын

I did not check the ring end gap. I agree with your comment with one caveat, cutting through logs is definitely not a minimal effort task. It's WOT for much longer periods of time than you would expect; certainly no different than the 40 seconds of WOT that it took to blow up this engine, if the log is big enough. In any case, these engines fail in a similar way with the stock piston as well. The issue appears to be an inadequate amount of cooling fins, which yes, based on the damage, it does appear that the rings end met up.

@christianhunt7382 Жыл бұрын

I'd argue that since it's on a bicycle, with no shrouds its getting better airflow, maybe though not as forced. And we're traveling at speed too, however, these engines are designed to be short burst power, not continuous burn running. You have to use the motor in the condition it was designed. I live in a small, valley town in Appalachia. To get up hills and ride (especially in colder months) is so fun and the phantom does it well, but to run flat by the river for extended amounts of time is not where this motor excels. Though if ran right, maintained speed can be "easier" on the motor, this motors failure was due to improper use. If your motors hot already, load a heavy burn on it, you can expect a failure. When riding these bikes you always have to keep in mind it's temperature.

@Matthew-wj8cm Жыл бұрын

Love your show. Now build that YD100 up! Port, polish, MZ65 pipe. I really want to see that.

@pulsar2121 Жыл бұрын

I'm glad you are enjoying the videos! Rest assured there will be some YD100 mods in the future.

@jeremyclarkson6293 Жыл бұрын

Hi sir i need some help im in the fence with this motor i am a kinda experienced with thsese engines i know these engines well and im on the fence if i should buy or not the phantom 85 if i piston swaped it trimed the port edges ran super fuel rich for cooling purposes and an 16:1 oil fuel mix always and dont run it for more than 20 straight Will the engine blow up on me

@pulsar2121 Жыл бұрын

Based on my short experience with this engine, I wouldn't recommend it. Reliability concerns aside, the engine was very buzzy and uncomfortable. It also seemed to only want to go fast. So, for my use-case of cruising around town, it was not a good fit.

@mikemiller3303 Жыл бұрын

Doing a similar experiment I've noticed the same problem with mine go a few miles and she's already getting hot like around 350

@pulsar2121 Жыл бұрын

Ooof! Yeah, that's toasty. It would be nice if someone made a liquid-cooled jug for these engines.

@christianhunt7382 Жыл бұрын

Best time to run them is objectively the worst time to ride. They love colder weather, but I damn sure don't!

@mikemiller3303 Жыл бұрын

@@christianhunt7382 I heard that a cold front hit Texas it was 30 and sleeting didn't stick already in the 40s but that will be it tell Tuesday then it will get better 👍

@SLAYJUCE 5 ай бұрын

3:50 thats your pressure plate haha

@Bobs-yer-uncle Жыл бұрын

I'm so glad I never bought one of these I almost did

@joebrown967 Жыл бұрын

That’s a stihl piston??

@pulsar2121 Жыл бұрын

Yes, I believe so. LA Hover Bikes swapped the piston. Check out his channel for more info on the build.

@shannon6815 Жыл бұрын

I wanted a phantom 85 but after seeing all the trouble they can pose. I'll just stick with cheap chinadoll. This is what happens to mine engine that had locked up. kzfaq.info/get/bejne/obSCZrRe3NjdgHU.html is what happened to mine. Though not nearly as bad as urs.