Messages

1

Projects / Mini-tooth

« on: November 24, 2016, 02:03:18 PM »

Exhaust in place

Smart carb had to be reworked as the OEM cr500 intake boot I purchsed new is a lil too long. Fixed the issue by taking the one off my sons CR500 and fitting it on being careful to drill mounting holes a lil higher to lower the whole carb as much as possible. It now clears the frame with lt500 intake boot installed. Thanks to Jared AKA Skeans1 for this idea.

Time to dissemble mock up and paint the frame.

what kind of bike did that snorkel come from?

2

Lounge / Panthera Motorsports producing a TRX500cc 2-Stroke Motor for a TRX450R Chassis-2017

« on: November 24, 2016, 09:49:31 AM »

That looks Totally do able - It looks like it would be easier than modifying the 250R cases.....and it will BOLT right into the 450R......But how much different are the mounting points from the 250R ??

Why do those cases look just like 250R cases? I don't own a 450R but I though the 450R was a 4 stroke

3

For Sale - Parts / Black OEM Honda 250R ATC fuel tank

« on: September 29, 2014, 12:09:02 PM »

O.b.o

4

For Sale - Parts / Black OEM Honda 250R ATC fuel tank

« on: September 28, 2014, 07:51:52 PM »

For sale OEM fuel tank for an 85-86 Honda 250R ATC. Tank only used for 2 race seasons. Tank has the normal wear and tear on it. It also has a few small gouges in it, please see pics.
Over all tank is in good condition, comes as pictured
Now the tank was used with a methanol set up so the gas cap has been drilled to allow it to breathe better.
Also the petcock has been modified internally to allowboth the regular and reserve settings to flow at the same time. There is NO screen on the petcock.
$125.00 shipped to the lower 48

5

Engine and Bottom End / crank with tins removed?

« on: September 23, 2014, 09:21:40 PM »

dont wanna get in a pissing match but some of the engines with the most hp per cc on planet use large case volumes and believe me its not concentrated down low in the crankshaft area

even back in the stone age when gordon jennings wrote his books he said trying to force the mixture into the cylinder with small case volumes was a thing of the past. if your pipe aint worth a shit, large case volume is probly only gonna add to your grief

people have even gone as far as to put shields just about the crankshaft wheels and tilt the reed block upward. essentually to keep as much mixture as possible out of the lower crankshaft area and let it go directly from the reed block to the transfer tunells

How do you know that some of the baddest 2 strokes in the country use large case volumes? Did the engine builders of these engines give you exact specs?
Do you even know what a large CCV ratio is? Is a 1.5 a large or small ratio?

Please go back and reread Jennings book because you have your facts incorrect

Your last paragraph really shows your lack of knowledge

6

Engine and Bottom End / crank with tins removed?

« on: September 23, 2014, 09:12:06 PM »

if theres very little space in the lower crank area for the mixture to occupy then it has no choice but to occupy the upper area. how can it occupy a space that doesnt exist ?  with the tins in place, that extra space doesnt exist anymore

By reading your previous post, you stated that "most crank shafts you have seen use tins or some other kind of stuffer, is NOT used to reduce volume but to move volume up higher"  We're are you going to put it?
Also what does putting a longer rod on the crank due for CCV?

7

Engine and Bottom End / ESR trx9 port match port timing

« on: September 22, 2014, 08:16:09 PM »

The exhaust port floor below the piston crown is perfectly normal. Graham Bell stated that the exhaust port floor needs to be even with or below the piston crown at BDC or high speed gas flow will be disrupted.

Just something to think about before you start altering trans or exhaust duration, you need to keep in mind the amount of blow down degrees the engine will have.

With your current timing of 187.5 and 120, you have 33.75 degrees of blow down. Which in my opinion is to much for a mx style engine

8

Engine and Bottom End / crank with tins removed?

« on: September 22, 2014, 07:33:37 PM »

FYI, volume inside an engine is just that...volume. It is not divided into sections.
Overall volume inside an engine is measured with the piston at TDC.

So obviously, everything under the piston at TDC is your engine volume

9

Engine and Bottom End / crank with tins removed?

« on: September 22, 2014, 07:30:42 PM »

Yes, volume among others things play a big role in how an engine performs. The is more to building an engine than just port durations.
An engine designed for high rpm us (like a drag engine) will tend to favor a small CCV because at high rpm the time the port is open is shorter. In a sence, it becomes harder to "fill" the cylinder with enough mixture to get the job done. A smaller CCV will increase the speed of the charge entering the transfers, this will aid in cylinder filling at high rpm. In general the more charge you can put in the cylinder, the more HP you make.
There is a down fall to a engine built for high rpm use, the engine tends to be peaky and not much fun to drive at lower rpms.
Now an engine built for MX will tend to favor a larger CCV because it will give the engine a little more flexibility. The cylinder does not need to be filled as quickly as a drag engine does.
If a cylinder gets filled to quickly, it can actually "push" the charge out the exhaust port and result in a power loss.

Now what I talk about here is just some basic "trends" in engine building. Every engine builder has their own way of building a particular style of engine.

10

Engine and Bottom End / crank with tins removed?

« on: September 21, 2014, 07:29:03 PM »

No tins on the crank will cause the crank case volume to increase. This will slow down the velocity (speed) of the mixture entering the transfers. Depending on what you are doing with the engine this may not necessarily be a bad thing.

11

Engine and Bottom End / WTF?? three torched pistons

« on: July 23, 2014, 01:14:07 PM »

was the spark plug loose each time the engine failed?

12

Lounge / TRX250R.org first year celebration. 4 sets .org engine stand give away

« on: July 02, 2014, 06:14:02 AM »

nice

13

Wanted / wtb V Force 2 reed cage

« on: June 09, 2014, 05:01:48 AM »

As it says, wanting to buy a V Force 2 reed cage
thanks

14

Wanted / Need 22" 14 paddle tires haulers

« on: June 05, 2014, 08:25:47 AM »

As title says, need a set of these either staggard or straight. Preferably Honda bolt pattern

15

For Sale - Parts / cases, a-arms, hood, stem, hubs for sale

« on: June 02, 2014, 08:25:25 AM »

pm sent