Recent Posts

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Duner / Re: 2019 Winchester bay 250r meet!
« Last post by The norm on August 20, 2019, 10:57:28 PM »
The black beauty

Carburetor, Intake, and Exhaust / Re: Homemade bigbore silencer
« Last post by The norm on August 15, 2019, 11:27:39 PM »
Man that sure doesn't look homemade. That looks professional as hell. Well done sir.

Loren does great work. Been riding on his pegs for a few years now & picking up one of his anti-vibe stems this weekend.

Awww shucks
Wanted / Re: New OMF radiator grill
« Last post by Hawaiiysr on August 12, 2019, 02:08:13 PM »
let me look in my stash
Projects / Re: LED HPI ignition install with pics
« Last post by The norm on August 08, 2019, 11:31:40 PM »
It wouldn't be to awful hard to key these aftermarket flywheels, but a taper bore driven up a tapered shaft is an extremely strong connection. What good is the woodruff key in your oem crank shaft alone? It is too weak to hold the flywheel by itself.  It is basically there just to time your flywheel. It would take a whole lot more horse power than a 250r can produce to spin the flywheel out of time if properly seated.

Projects / Re: Laeger 250R
« Last post by Hawaiiysr on August 08, 2019, 01:26:59 PM »
thats sweet ride Joe. a narrow CR500 rear is my dream R. saving my pennies for a ISF.
Engine and Bottom End / Re: Afco radiators
« Last post by Tbone07 on August 07, 2019, 10:48:24 AM »
Can you post pics of the radiator when you get it? That would be nice
Carburetor, Intake, and Exhaust / Re: Pingel petcock
« Last post by Jerry Hall on August 05, 2019, 11:56:29 AM »
I instruct all of my customers to ALWAYS run their petcocks in the reserve position.  Petcocks obtain their fuel from the lowest level in most fuel tanks when positioned in the reserve position.  Petcocks obtain their fuel from a stand pipe that may be 2 or more inches from the bottom of the fuel tank when placed in the on position.  High performance two strokes that are highly tuned, can burn a piston in less than a couple of seconds or so when the air fuel mixture becomes too lean. 

I have seen a large number of pistons torched on engines that had the petcock positioned in the on position.  The fuel level in the float bowl does not stay consistent when the fuel tank level becomes low enough to not keep the stand pipe on the petcock completely submerged 100% of the time. 

As the fuel level in the fuel tank becomes lower and lower and the fuel is sloshing around, the stand pipe is not providing fuel to the float valve 100% of the time.  The inconsistent fuel supply to the float valve causes the fuel level in the float bowl to stay lower for longer periods of time until the lean condition causes a piston failure. 

A two stroke will need a fuel flow rate through the carburetor of at least 6 gallons per hour when developing around 70 hp.  You will never use 6 gallons per hour if your engine develops 70 hp but the fuel supply past the float valve must be at least 6 gallons per hour any time the engine is developing 70 hp to keep it from going lean for the period of time it is at that power level. 

A flow test with a full tank will provides a lot more fuel pressure and flow, so always perform this flow test when the fuel level in the tank is 1 to 2 inches from the bottom of the tank.
Pumashine 250R Products / Re: Trx250r Resi clamps
« Last post by Sand_Blaster on August 04, 2019, 02:46:42 PM »
Tony you still up for making clamps? I need 2 for some works, and my buddy needs 2 as well for his works. I can get you specs in a bit if you are interested.
The Mad Scientist / Re: WP covers
« Last post by croat1 on August 03, 2019, 02:08:38 PM »
That would probably violate advertising rules?

Sonny, thanks for being a stand up guy.  Yes, it would violate the rules.

Carburetor, Intake, and Exhaust / Re: UPP Intake Boot Ripped
« Last post by SFricia on August 02, 2019, 10:46:00 PM »
We all have to remember that we are dealing with a consumable part. Rubber doesn't last forever whether it is an OEM boot or a billet manifold.

I have been drag racing 2-strokes for over 20 years and I have had issues with both styles. Neither are without issue, but an issue with the UPP is the stress you put on the intake by trying to force it into an unnatural position to get it to fit inside the chassis.
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