Panthera electric start

[croat1]

Passing info along

Sal Adatsi https://pantheramotorsports.com/trx250r-atc250r-1985-1989-electric-starter-pre-order

[diggster69]

Has anyone gotten the chance to use this on a 250r yet? 

[croat1]

Has anyone gotten the chance to use this on a 250r yet? 

I haven’t heard of anyone that purchased.

Joe

[Jerry Hall]

Does anyone know anyone that has one of the Panthera 500 single cylinder engines or read any reviews that were not from Panthera's web site?

[Langbolt]

@Gerry Hall , look up Roger Schneider on FB - Honda 250R Based Hybrid ATVs

He had Arlan port and build a pipe for it - He wanted a LOW end power plant....the pipe that Panthera supplies is for top end.

)

[croat1]

@Piney0

Joe, did you ever see Rogers Panthera powered quad run?

Jerry, I have only heard of 1 Panthera powered quad in the states.  It’s the one that Langbolt  mentions.  Piney0 (Joe) might have some information.

[croat1]

Electric start kit.  Notice the offset required (supplied) shifter

Joe

[Jerry Hall]

@Piney0

Joe, did you ever see Rogers Panthera powered quad run?

Jerry, I have only heard of 1 Panthera powered quad in the states.  It’s the one that Langbolt  mentions.  Piney0 (Joe) might have some information.

I have a customer in Oregon that has a close friend named John Montgomery that bought a Panthera 500 engine package.  I think that he put the Panthera in a LT 500 chassis.  The report I got was it turned a lot of RPM,  it did not have much torque, it was slower on the big sand hills than the pack of LT500s he dune rode with.  He had many phone conservations with the tech guys at Panthera.  He tried the things that Panthera recommended but it still did not raise the engine performance anywhere close to the advertised power level.  John eventually took it to Arlan.  Arlan built a pipe, and ported the cylinder.  He said it moved the power band to a lower RPM range but did not improve the acceleration or the pulling power on the long or short sand hills.  My customer said that John has spent almost $20,000 on the engine package, gearing, tires, carburetors, professional tuning, pipes, porting etc. etc.  My customer suspects that there is something wrong with the cylinder design.  They called Elaine Pollet at CP industries.  She said CP manufactures the cylinders for Panthera, but to Panthera's unique internal port design. 

This is the only report/opinion I have heard on the Panthera 500.  Does anyone else have any different reports than the one above.

[Piney0]

I just saw this tag asking if I saw Rogers panthera run.   

Roger's Panthera is in a Sundahl frame that was originally designed for a trx450r engine.  He originally had the pipe that came from Panthera modified so it could be installed in the SRP chassis.  He was unhappy with how this was performing.   He sent the whole thing to Arlen who measured the port timings, and made a pipe to fit the frame.  His cylinder isn't modified by Arlen, still the stock panthera porting, and he also runs a smaller carb because of space limitations.  I believe it's a Keihin PWK bored out as much as possible.


I can only compare it to another friends quad which is a walsh chassis with a 430 puma in it running the newest piston / porting that LED offers with a LED puma pipe.  This quad is running 14/34 and 14/36 gearing and a Mikuni TMX carb off a 2000 CR250.

The puma can keep up with the panthera and they are fairly equal for most of a run,  but the Panthera is able to go faster than the puma and pulls away in high gear because of that.  keep in mind, the rider of the Panthera is roughly 100lbs heavier than the rider on the puma, and runs huge desert tires which i feel is a lot more unsprung weight to spin too

Roger is happy with how the Panthera performs now, and isn't looking for any more power.  He was told that there's more power that could easily be made by modifying the cylinder and head.

I hope this helps,  it's not easy to compare these 2 machines with how different they are.

[croat1]

The link to the youtube installation video if you didn’t see it in the first post.

https://m.youtube.com/watch?v=zmqf4ZnuHLA&t=200s

Joe

[croat1]

Electric start feedback.  Not mine just sharing.


it's definitely pricey, works great. Definitely have to measure what they tell you, pay attention to how it goes together, I had a flywheel problem maybe off a atc250r? Was slightly different caused some problems. The flywheel I had was slightly taller like 4mm-6mm, caused the gears not to turn just putting the cover on, so I shimmed it out with 3 stator gaskets to get the right gear face to gear face measurement they want and for the gears to turn and the round holes to accept the line up pins on the Panthera gear were loose not tight like it should of been. So after 2 rides it caused the crank nut to get loose maybe too. So I had another definite great condition trx250r flywheel and it worked better with the gear and the measurements were more correct. Possibly the esr cases for stator gasket area might be more shallow as well just slightly?   And absolutely after the first ride, drain the oil, pull the stator/starter cover, take a good look at everything, the gears etc,  retorque everything, the crank nut, even some loctite blue on it. Everything will loosen up, but that's kinda expected with all new stuff. After all that, works fine. I'd say in most situations it'll all work fine.

Joe