Posts
443
Joined
4/24/2014
Location
San Diego, CA
US
Edited Date/Time
4/23/2019 10:15am
Reference this past TT thread if you would like to read detailed information on riders experience.
http://www.thumperta...1020420-yz-325/
There is no Replacement for Displacement!!! Repeat those words over and over because once you feel a 325 Two-Stroke Torque (close to a 450) down low, you will kick yourself for waiting to buy the kit! In the FIM World Enduro Championship (WEC) the E3 Class (290+ 2-Stroke or 475+ 4-Stroke) most of the best riders are on 300 2-Strokes. Most of the time, the 300 2-Stroke riders will be faster than the E1 250 4-Stroke class or E2 450 4-Stroke class. So with this kit it allows you to have 1 Fun Bike with the Broadest (Linear) Power Band for Motocross and Off-Road riding!
Eddie Sanders Racing (ESR) http://www.eddie-sanders-racing.com/category_s/126.htm
Options: 325 (option-5 Oversize Pistons) (33% Displacement increase over 250) / 345 (option-2 Oversize Pistons) (38% Displacement increase over 250), Aluminum Cylinder (Can be Re-sleeved), Machined Head, Piston, Adjustable Power Valve and Gaskets a $900 to $1000 investment.
Options: Thinking of buying a 2016 YZ250X ($7,390), YZ250FX ($7,890), YZ450FX ($8,890) Model, if you have the money good for you. Or spend the money on a used Yamaha YZ 250 ($3K to $5K), add a skid plate, front disc cover maybe some other preferred items. After riding the YZ ESR 325 I would say, all the 250’s or 450’s are now second rate compared to the YZ ESR 325! I believe ESR is the best VALUE Big Bore with the BROADEST power band available!
Yamaha YZ with ESR 325 Kit - (250 was 212 LBS. Dry - 228 Wet) (YZ 325 - 214 LBS. Dry est.)
Weight Benefit over YZ 250FX, (231 LBS Dry est. – 247 Wet or 16 LBS. heavier) YZ450FX (240 LBS. Dry est. – 262 LBS. Wet) – (30 LBS. heavier) (Note: Fuel weighs 8 LBS. / 1 gal.)
Recent Rides: YZ ESR 325
-MX Tracks, torque out of the turn, nice linear power band (easier to ride), stronger than a 250 could ever hope to be! (Yamaha YZ250X or YZ250/450 FX bikes with wider gearing will be at a disadvantage)
-Off-Road (OHV areas), try to stall my bike you may not be able to! Want to ride Trials like for Extreme Enduro, no problem! (YZ 250 (non X) will have less top end)
Setup: Yamaha YZ ESR 325 - 2007 Model
-ESR 325, S7 Woods Porting, Silver Head, Race Gas Dome, (Use Race/Pump Gas 50/50)
-168 Main Jet (ESR recommended Main) and 48 Pilot Jet, Needle in the top position, may go to a 45 Pilot and change the needle position to minimize any unburned oil. Riding Altitude 500’ to 4100’
-Maxima Formula K2 Two Stroke Oil – Flash Point 240 Degrees (One of the Lowest) (helps reduce unburned oil) (40 to 1)
-No Fly Wheel Weight needed, but on the 250 engine a 9 oz. worked well.
-Rekluse EXP Core 2.0 Auto Clutch Kit
Summary: I do not work for ESR, but this bike is awesome! No more 250 for me! Dyno run coming in the future.
http://www.thumperta...1020420-yz-325/
There is no Replacement for Displacement!!! Repeat those words over and over because once you feel a 325 Two-Stroke Torque (close to a 450) down low, you will kick yourself for waiting to buy the kit! In the FIM World Enduro Championship (WEC) the E3 Class (290+ 2-Stroke or 475+ 4-Stroke) most of the best riders are on 300 2-Strokes. Most of the time, the 300 2-Stroke riders will be faster than the E1 250 4-Stroke class or E2 450 4-Stroke class. So with this kit it allows you to have 1 Fun Bike with the Broadest (Linear) Power Band for Motocross and Off-Road riding!
Eddie Sanders Racing (ESR) http://www.eddie-sanders-racing.com/category_s/126.htm
Options: 325 (option-5 Oversize Pistons) (33% Displacement increase over 250) / 345 (option-2 Oversize Pistons) (38% Displacement increase over 250), Aluminum Cylinder (Can be Re-sleeved), Machined Head, Piston, Adjustable Power Valve and Gaskets a $900 to $1000 investment.
Options: Thinking of buying a 2016 YZ250X ($7,390), YZ250FX ($7,890), YZ450FX ($8,890) Model, if you have the money good for you. Or spend the money on a used Yamaha YZ 250 ($3K to $5K), add a skid plate, front disc cover maybe some other preferred items. After riding the YZ ESR 325 I would say, all the 250’s or 450’s are now second rate compared to the YZ ESR 325! I believe ESR is the best VALUE Big Bore with the BROADEST power band available!
Yamaha YZ with ESR 325 Kit - (250 was 212 LBS. Dry - 228 Wet) (YZ 325 - 214 LBS. Dry est.)
Weight Benefit over YZ 250FX, (231 LBS Dry est. – 247 Wet or 16 LBS. heavier) YZ450FX (240 LBS. Dry est. – 262 LBS. Wet) – (30 LBS. heavier) (Note: Fuel weighs 8 LBS. / 1 gal.)
Recent Rides: YZ ESR 325
-MX Tracks, torque out of the turn, nice linear power band (easier to ride), stronger than a 250 could ever hope to be! (Yamaha YZ250X or YZ250/450 FX bikes with wider gearing will be at a disadvantage)
-Off-Road (OHV areas), try to stall my bike you may not be able to! Want to ride Trials like for Extreme Enduro, no problem! (YZ 250 (non X) will have less top end)
Setup: Yamaha YZ ESR 325 - 2007 Model
-ESR 325, S7 Woods Porting, Silver Head, Race Gas Dome, (Use Race/Pump Gas 50/50)
-168 Main Jet (ESR recommended Main) and 48 Pilot Jet, Needle in the top position, may go to a 45 Pilot and change the needle position to minimize any unburned oil. Riding Altitude 500’ to 4100’
-Maxima Formula K2 Two Stroke Oil – Flash Point 240 Degrees (One of the Lowest) (helps reduce unburned oil) (40 to 1)
-No Fly Wheel Weight needed, but on the 250 engine a 9 oz. worked well.
-Rekluse EXP Core 2.0 Auto Clutch Kit
Summary: I do not work for ESR, but this bike is awesome! No more 250 for me! Dyno run coming in the future.
The Shop
-Maxima Formula K2 Two Stroke Oil – Flash Point 240 Degrees (One of the Lowest) (helps reduce unburned oil) (40 to 1)
If you have a recommendation I am all ears! My next step is to try a 45 (down from a 48) Pilot Jet.
Question 2. Have you had it in the sand yet? No, but I was told by Eddie that it revs similar to a 250, after riding the 325 I agree. Where the 345 is a slower rev type (naturally because of the size of the piston) engine and would be for high speed desert type riding. One way or another it is way more fun than a 250!
Question 3. To the question would a 265 produce any real Torque? A 6% Increase in piston size would barely be noticeable in my opinion. Think about it! You want a noticeable difference to achieve an all around MX/Off-Road bike, not just gain .3 tenths of a second on an MX course. So why spend the money, this is all about ------VALUE-----, not expensive engines like 4-Strokes! In 1 to 3 years depending on how much you ride I am looking at $150, a 4-T guy is looking at $1,100 Top End rebuild! I believe in the KISS principle! Keep It Simple Stupid!
Yes it is not perfectly tight across the foam, but that is because I may still change the bump position. I looked at a lot of Pros bikes and saw that the starting point is 10 - 13" from the rear fender, mine is at 10", so if I want to position myself further forward then 13" is called for. Right now I love it where it is, it really works for bumpy corners when you want to stay forward.
By the way the bump is from Factory Effex.
http://tmdesignworks.com/index.php?main_page=product_info&cPath=144&pro…
Yes I still have a bad fitting seat cover! LOL!
I took a video of it with the customer prior to the run. I told him what a stock yz250 makes on our dyno (45-46), then asked him what he expected his ESR 325 to make. His comment was "It rips, must be 55 hp".
Bike has FMF pipe, PC silencer, and vforce and he had run the jetting around the ringer to get it to run right. ESR sent him some suggestions - and he was close, but he had constant bogging issues he couldn't quite resolve.
This first chart is as suggested by ESR as a base - then lots of track testing with both the Powervalve setting and the jetting.
Now is a mod 250cc combo vs this 325
And lastly is a low end woods style mod 250 vs the 325 combo
Sadly the customer made it to hour 30 and the piston shattered into a million pieces. I applaud ESR for his efforts and his vision. I hope the product takes off - with some development it can make some good HP. But I hate the steel liner - this is a huge step backwards in technology and requires a looser fit to prevent seizures - which isn't good for durability. Our customer was so fed up with various bog issues and constant "finicky" ness - he went back to a 250. Once back to the 250 - his comments were the "vibration is much less" and it's quicker to rev (as expected)
The actual power output of the 325 per cc sucks - but is much better than stock - and much better than the most common 300 cc "big bore" sold. I hope the kit can go towards plating rather than a steel liner - and some port work goes a long way.
Edit: Just saw this dude's dyno post under the OP.. yep. lol
Concerning the Steel Cylinder Sleeve, no its not state of the art but it works for now. See the below Thumper Talk ESR 325 owners comment ......i'm 83 hr on orig,probably past,,,
Not sure what brand of piston you had, but the Wiseco Piston that came with my kit looks like a good quality one to me.
From MXA-Piston Life: In reference to your comment 30 hours maybe a little short.
A 125 two-stroke’s piston and rings should be changed every 15 hours (a Pro should change them every 7 hours). A 250 two-stroke might go 40 hours in the hands of a local Vet or Novice (a Pro should change them every 15 hours). A 250F piston can go 40 hours (less in the hands of a Pro). A 450F piston might go 60 hours, but a Pro would be crazy to go beyond 20 hours. MXA has had 450cc four-stroke pistons with 100 hours on them, but that is gambling
Plating might be better, but at this time ESR provides a good product at a reasonable price.
I will repeat myself, the Torque/HP while riding on the MX Track and Off-road is so far above my 250 it is not even funny!
This is an AWESOME bike!
Thats all shes got.
Piston was as supplied by esr and ridden hard like it should be ridden mx only...
And yes, vs a stone stock engine it makes much better power everywhere. Its even competitive with a stone stock ktm300, although not better anywhere.
Your jetting is for sure rich. Id expect a 42 pilot in summer at your altitude and a 160 main as your biggest you would be. The big bores all pull faster through the carb delivering more fuel per same size jet.
Our 292 kit likes a 155 around 80 degrees 1000 ft.
A customer in south africa is at a 150 42 and leanest clip during summer while riding at some elevation
Do not try that jetting on a 250 or 265!!! Oem is quite close aroind 60-70 degrees sea level
Do you plate with Nikasil?
Pit Row
Its 5-6hp up and flat out a blast to ride, ultra reliable and easy to jet.
Our 265 tuned in vs our 250 mod is a tad better everywhere once the pv opens.
Past 265 cc the cylinder has major issues. Our 250 mod out dynos the most popular 300 kit sold everywhere in the curve. Its been our experience that most people do not have their 250 stock tuned in for best performance.... So when they go to some kits out there they inevitably start tuning that kit to get it best... And are much better than their untuned stocker... But not much better than a well tuned stocker.
With half and hald c12 and pump, a stock port and head yz250 with some added ignition timing and ur favorite pipe can gain huge hp when jetting is right. Few people make use of this resource..
Once your making this power the bike responds extremely well to a 48 rear sprocket to spread it out.
Well jakes dad. I got a yz 325 to do
(Harris knows all about it)
Kicker is . I got to make a pipe.
Cause its in a quad frame.
But the 325 and its terrible pipe ratio needs
Exactly this. What is a pipe ratio?
If you know what the pipe holds in volume/cc
And / this by the engine size. That is your pipe ratio. This with the pipes tuned length makes the power curve with your porting. (Thats the short explanation ) and this goes hand and hand on the power you can make. Bigger engines need bigger pipes. Plain and simple. That means bigger everywhere usually. And done right. Makes more everywhere.
And of corse its going on the dyno.
My review:
Eddie Sanders Racing (ESR) YZ 250, 325, 345 Pipe $185 or $205 (with nickel Plating)
http://www.eddie-sanders-racing.com/product_p/yz.250.pipe.htm
Compared to my FMF Gnarly Pipe, the ESR Pipe does produce more Torque/Horsepower (maybe 10 to 20%) from Bottom to Top. The Gnarly is a good pipe and provided very good Torque/Horsepower from the Bottom to Mid-Range just like my older Factory Fatty (I have had both) Pipe. The FMF Gnarly along with the ESR Cylinder 325 Kit had a Hit at the top or in the last 2K RPM’s, and this is where the ESR Pipe smoothed out the already Linear Power Band you get when using a 325 over a 250 even more.
I have to say it’s an epic 4-Stroke like feel from a 2-Stroke! Lighter and Less costly is the best of both worlds!
After talking with ESR to learn the difference from my old FMF Pipe, the ESR Pipe is supposed to be roughly 30 to 40 mm (or 1”+) Longer, slightly Larger in diameter and of course a different shape.
I liked my FMF, but with the ESR you get a slightly better value at $185 or $205 (with Nickel Plating) Pipe than an FMF $245 Pipe.
Recommend Nickel plated Expansion Chamber, you get very low Maintenance
Note:
I am an Intermediate Rider, riding Motocross Tracks and Off-Road Dirt/Sand Conditions in SOCAL.
Yamaha are you listening? They should introduce at a minimum a 300 or 350, with Transfer Port Injection!
What works best for me.
Main Jet 165 (handles 25% and above throttle)
Pilot Jet 42 (handles 0-25% throttle)
Make sure you have NO and I mean NO Air Leaks coming in from the Lines, Carb or other Engine areas, this will always cause problems.
ESR 325 Kit is the BEST Value for the money, period!
By the way I work for General Dynamics........Defense Program
Thnxz for posting your feedback.
It´s absolute okay to chose a oil with low flaming point
Greets from the KRAUTS
i use a ESR 325 YZ Kit too
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