Messages

1

Carburetor, Intake, and Exhaust / Re: Air filters

« on: February 12, 2020, 01:54:11 PM »

I've found paper filters to clog too easily.  They work fine for cars because your car isn't really seeing the dusty conditions that offroad filters see.

I don't know about all Polaris quads, but the Polaris Trailblazer (which is basically a full-sized kid's quad) comes stock with a paper filter, and that sucker just clogged up all the time until I tossed it for a foam filter.

2

Engine and Bottom End / Re: Not your typical oil question: Castor oils

« on: December 23, 2019, 11:37:48 PM »

And now I'm intrigued on the topic of double ester oils as well.  The only thing I know (without research) is that the term "ester" is usually synonymous with "synthetic".  Can you point me towards some research material?  I can't seem to find much except marketing hype.

3

Engine and Bottom End / Re: Not your typical oil question: Castor oils

« on: December 23, 2019, 11:25:51 PM »

I started writing a response to the post by wilkin250r  but it was getting too long and had not even started to answer the questions.  I will try to edit my response and post it in a few days.  This is not a question that can be answered by a simple yes or no answer.

Jerry, I've always respected your experience and knowledge.  And I love the forums (vs the facebook groups) because you CAN write long responses and have lengthy, in-depth discussions that aren't conducive to the instant-gratification environment of the comments section on facebook.  I eagerly await your input.

4

Engine and Bottom End / Not your typical oil question: Castor oils

« on: November 21, 2019, 02:59:49 PM »

So all over the internet, you can see debates about various oils, mostly in the categories of Castor vs Petroleum vs Synthetics.  I don't think anybody really runs petroleum-based, so that doesn't apply, and you don't really see many of those arguements anymore.  So mainly, castor vs synthetic.  We can debate those a little here if you want.

However, what I cannot find, but I KNOW was an issue many years back, was SWITCHING to and from Castor oils.

Decades back, it seemed like it was common knowledge that if you run castor oil, you're stuck with castor oil forever.  The castor oil left a "varnish" behind that wasn't an issue with continued castor use, but that "varnish" wouldn't allow a non-castor oil to properly wet the lubricated surfaces (think water beading on a waxed surface), and without sufficient coverage, you don't get sufficient lubrication.  So the common philosophy at the time was that you can always switch to castor oil, but you can never switch back unless you replaced every single bearing.

Has anybody ever heard this?  Or heard this disputed?  Is it because it was all just a myth?  Or is it because that problem may have indeed occurred with petroleum-based oils, but doesn't occur with synthetics?

5

Lounge / Re: Anyone know how to design a program for a calculator to print a flywheel timing tape

« on: October 18, 2019, 02:05:09 AM »

It might actually be easier to make an adhesive timing wheel.  The beauty of it is that you wouldn't need to know the actual circumference, and calculations like a timing tape around the outside of the flywheel.  Timing and degree marks would extend outwards as far as needed.

With a printable design, you can buy a dozen shipping labels at Walmart for $3, and print as many as you need.

Forgive the crudeness of the image, I didn't feel like spending more than 4 minutes with Photoshop.  You get the idea.

6

Carburetor, Intake, and Exhaust / Re: ESR exhaust flange O-ring size

« on: July 21, 2019, 03:11:57 AM »

The more I experiment, the more I'm leaning towards the OEM solution.  The only pipe/flange combo I ever had that didn't leak was an OEM flange with the split ring and the OEM seal.

I'll try a few things, and I'll even give one attempt at a high dollar o-rings like Kalrez (at $50 each, but they claim 50% higher temp rating than silicone).  However, with all the other projects I have going at the moment, I can't promise when I'll get to it.

7

Carburetor, Intake, and Exhaust / Re: ESR exhaust flange O-ring size

« on: July 15, 2019, 11:17:06 PM »

So, I'll admit I haven't been super motivated on this project, I still want to try a few styles of o-rings I mentioned earlier in this thread, but I haven't gotten around to it. 

But I CAN give you a slight update.  I stated in post #8, I assembled the pipe with just standard o-rings and no RTV.  After about 5 hours of ride time, we have blown through the rings and the pipe is leaking again.  This doesn't mean that everybody will have this exact same experience, but for me, I'm going to try some new things.  I'm on a quest for a leak-free pipe.  It's a long quest, obviously, but a quest all the same.

8

Carburetor, Intake, and Exhaust / Re: ESR exhaust flange O-ring size

« on: May 28, 2019, 01:11:28 AM »

Ok I finally found the ones I ordered from McMaster Carr awhile back.

Part #1283N151-----3/32" W, 1-7/8 ID, 2-1/16" OD Viton rings

Those come up as a Silicone, not Viton.  Same as I described in my first post, size #134.

9

Carburetor, Intake, and Exhaust / Re: ESR exhaust flange O-ring size

« on: May 23, 2019, 09:07:25 PM »

https://www.motosport.com/oem-parts/part-number/0770440030

Looks like it is 44x3

And they look to be Viton.

I think you might be better off with a slightly larger inner diameter.  I measured right about 1.94 inches for my exhaust flange o-ring groove ID, and 44mm is about 1.73, meaning your o-ring is almost 3/4 inch too short for that length.  Not terrible, because you actually want it to stretch a little, but it means if your o-ring gets hot and cracks in one spot, you now have a 3/4 gap as it rips and withdraws.

McMaster sells Viton o-rings in 3x47 (1.85" ID), 3x48 (1.89" ID) and 3x49 (1.93" ID).  I might pick me up a set of each, package of 5 is less than $10.  Slightly more expensive than the silicone, but I'm certainly not going to complain about spending $6 instead of $4.50 for a set of o-rings on my exhaust.  And who knows, the Viton might hold up better than the silicone, even though the temperature specifications say it won't.

10

Carburetor, Intake, and Exhaust / Re: ESR exhaust flange O-ring size

« on: May 22, 2019, 12:41:04 AM »

On a side note, a metric o-ring 3x47 looks to be a perfect size (3mm width, 47mm ID).  By the specs, it's slightly thicker than the #134, (0.118" vs 0.103") and nearly the same ID. 

Problem is, metric o-rings just aren't as common, and exotic materials even less common.  McMaster doesn't carry them in a silicone, but they DO carry them in a Viton, which has nearly the same upper heat range, and similar price.  I think I'm going to get me some.

My current experiment is running this 250r with no RTV, just new o-rings.  It previously leaked with o-rings and copper RTV, so we'll see what happens without the RTV.

11

Carburetor, Intake, and Exhaust / Re: ESR exhaust flange O-ring size

« on: May 22, 2019, 12:24:58 AM »

I buy the o rings for the KTM 300 and 250. They are thicker. I usually have to grease them to slip the pipe on. A little patience helps too. Seems to seal good with no rvt. You kinda have to stretch them over the flange

Send me a link (or part number, or something) and I'll order a couple of those o-rings and measure them, I'll find out exactly what they are.

12

Carburetor, Intake, and Exhaust / Re: ESR exhaust flange O-ring size

« on: May 14, 2019, 07:43:56 PM »

Based on their price and temperature requirements, I'd give it a 98% certainty these are standard hi-temp silicone.  Anything more exotic and high temp is significantly more expensive.  Kalrez o-rings around that size are about $50 per o-ring.  I'm actually not opposed to spending that kinda money, but not before I do some more testing.

McMaster has a large selection of 0-rings.  A standard #924 is a little thicker, but also smaller ID and OD, so I don't know if I want to stretch them that much.

A #225 o-ring might work, but it's a little thicker than I want.  It's listed as a 0.139" thickness, and the groove I have only measures 0.120".  That might be a tough squeeze.

13

Carburetor, Intake, and Exhaust / ESR exhaust flange O-ring size

« on: May 13, 2019, 11:32:08 PM »

So I wanted to look around for new o-rings for my ESR exhaust flange, and I found a whole lot of people talking about them, but I never saw anybody post any specific sizes.  It was almost like a government conspiracy.  Not that I have a problem with ESRs prices or availability, I just wanted to look for maybe thicker rings, or different (more expensive) materials.

So I'm going to share my thought and findings, because I couldn't find the information anywhere else.

The o-rings I got from ESR are a hair over 0.100" in width, and since 0.103" is a fairly common width for o-rings, I'm running with that assumption.  It's either that, or assume they are metric, and I just don't think they are metric.

It's kinda tough to get an exact ID and OD on o-rings this large, because they don't hold a perfect shape at rest, they're kind of an oval.  I tried measuring the largest diameter at rest, and the smallest diameter, and finding the average.  I'm coming up with about 1.866.  This is subject to a very high degree of error.  This would mean the OD is about 2.072" (by calculation, not measurement)

My calipers don't fit exactly in the groove of my flange, but I believe I'm measuring a diameter of 1.942".  I know I'm going to want my o-ring ID to be smaller, to ensure a tight fit.  The width of my groove is about 0.120"



So I went through charts of o-rings, with the basic assumption these are standard size.  3/32 is a common o-ring size at the previously mentioned 0.103" width, and looking for the ID and OD to match closest to what I was measuring.

The end result is I believe these are a standard size #134 o-ring.  Standard dimensions are 3/32 width, 1-7/8 ID, 2-1/16 OD.  Actual listed dimensions are 0.103" width, 1.862" ID, 2.068 OD.  These are just a few thousands off from my actual measurements, so I'm pretty confident.

14

Carburetor, Intake, and Exhaust / Re: 36mm PWK Jetting

« on: September 12, 2018, 02:38:06 PM »

after talking to carb parts warehouse.  it was suggested a 35mm was a better choice for my application.

Did you ever get that 35mm up and running?  How do you like it?  What kind of build was it?

15

Carburetor, Intake, and Exhaust / Re: Exhaust Hangers - Who?

« on: September 12, 2018, 02:35:37 PM »

Somebody in the community made some OEM-style exhaust hangers a while back.  They looked great, but only lasted about a year before the rubber had shrunk so much it they apart.  My OEM ones still look great, so I bought some new OEM ones not too long ago to use as spares.  The silencer hanger is a little difficult to get a hold of, so any time I see one on Ebay in good condition, I grab it.