The Ultimate YZ300 2 Stroke Engine Build 

Appreciate it, hopefully not for long!

So is my mother. Check out her OF

@@KincadePavich I hope so too love your content bro 😁😁

@@KincadePavich your channel got push to my recommendations so hopefully the algorithm is on your side! love the video man

@@Fee.1 already did now my phone is all sticky

Thanks Dan! Appreciate the support!

Thanks a ton!

Thanks a ton! I think my RM125 was just a special case... I've built quite a few engines, and that was the only time that ever happened to me.

Thanks Lukas!

Appreciated!

Much appreciated! Yep, I thought this was going to be done weeks ago but kept running into problems! Stoked it's finally together.

Thanks for watching John! I wish you could enter too, but thanks for following the build regardless!

Haha good eyes! Appreciate the support!

Thank you!!

Yewww she's getting there! Thanks for the support!

Thank you!!

Thank you!

Hope you enjoy!

Yes, I used the charging system on this one!

Thank you!

Hey, yes, standard right hand threads. Torque should be 40ft lbs so it can be tough to break. Should go pretty easy with a breaker bar or an impact though!

I would check rocky mountain and see if they have the OEM parts available!

I don't think so - only specific years and models are like this. For many baskets they just slip in. If it was a press fit one like this, it would've came with instructions

They did. They handled it very well. It was an interesting situation because the ProX basket was provided under sponsorship, but they were out of stock of Wiseco baskets so I did purchase the new one. Had Wiseco been able to provide a basket under sponsorship I'd have liked to not have to take the machine shop's money, but that's how it ended up working out. They didn't really give me a lot of details on why they couldn't get it straight, but essentially they called me and said "hey, we screwed up, we owe you a basket." Apparently they don't offer that sort of work, and the guy who agreed to do it shouldn't have. But very pleased with how they handled it and I feel bad that it had to cost them money.

@@KincadePavich You seem like a really nice dude, they screwed up for sure but it sounds like you handled it well. That's awesome. Can't wait to see the finale video of the YZ300!

I just use the throwaway plastic sheets that stick onto the glass, but the most important part I've found is proper dust collection. Before I had my dust collection working right, it would be unviewable within 15 or 20 minutes. My vacuum runs the entire time and flows well.

@Kincade Pavich thx, yea I have the dust deputy set up and run my lil husky vacuum clears it up the dust really good.

Hey Beau, I appreciate the comment. It seems this is still the widely accepted reputation of Wiseco cranks based on comments on this video. I'm curious if this is a result of previous failures that tarnished their reputation, or if you have reasonable evidence to believe they are to this day still no good. Talking to Kevin at Wiseco who I've been working with for some time, he truly believes Wiseco is now developing a quality crankshaft and admits that they weren't always. All this said, I'm not claiming to be incredibly well versed in the matter and don't have enough builds under my belt to prove or disprove this. The engine is bolted up and in the frame, and I hope this crankshaft lives a long happy life cycling this piston up and down. I am certainly not just ignoring these comments, and would love to get to the bottom of whether people are still experiencing Wiseco crank failures or not. All of the forums I seem to find discussing failures are from many years ago.

@@KincadePavich Thank you for the reply. Curious, did you see if the Rod had any origin marked on it? I see on Wiseco's article a "Made in Japan" on the rod. But I kind of question whether those were R&D cranks or not. I havent seen a Wiseco crank with a Japanese Rod. As far as evidence I don't have photos or things of that nature, but I can tell you I have physically replaced 3 Wiseco crankshafts in the past year that have failed prematurely. The big end bearing wears out quickly best case. Worst case is the rod breaks and wipes out the entire motor. Not to mention some runout issues from the factory. Obviously I do not know the entire history or age of the Crankshafts I replaced since I was not the one to build the motor before they came to my shop. I do know that most of the time if there is a bad crank found when I am rebuilding a top end, it is almost always a Wiseco. They sure do look nice. But the quality of materials and manufacturing in China just isn't as good as the other options. The way I look at it is why use a Chinese crankshaft when there are Japanese options available for similar money? If you get a rod kit and have your factory crank rebuilt to OEM specs you will likely save a good chunk of change too. I know you already have the motor built, and I am not suggesting you pull that one apart. I also wouldn't lose sleep over a Wiseco crank being inside that motor. I only commented because it seemed like you were still in the process of making a decision on which crank to go with and figured I would offer my recommendation. I am excited to see the final product. The bike is going to be really cool.

I use a GoPro Hero 10 and my iPhone 13

@@KincadePavich tq sir

Someone else pointed this out - I should have used the updated part. I ordered one for an '05 and they didn't make the new part number supersede for the older years, I looked it up after the fact. Hindsight 20/20.

@@KincadePavich Well I never had any problem with mine, I only replaced it because I had to rebuild the transmission. I wouldn't worry about it.

Thanks Raymund!

I don't think so... why is that?

@@KincadePavichpeople commonly swap the WR or YZ250x 3rd, 4th, and 5th head gears to obtain a wider ratio transmission. I believe Rocky Mountain ATV actually sells a kit to do so.

Hi!!

Hey there, would you elaborate on why you think that?

@@KincadePavich I've seen brand new wiseco complete cranks snap rods in less than 5 hours MULTIPLE times and those having been used by different people each time, over a number of years. I will not sell them, I will not install them, i cannot recommend them. Wiseco makes a fine piston, stick with OEM rods or have crank works build you something better than OEM.

Welcome to the channel!

Ahh good to know! I'm surprised they don't just supersede that part - I just checked and I did indeed order one of the older style ones. Hindsight 20/20.

@KincadePavich one thing I do when I get a bike I research for any possible trouble areas that consistently occur and see what is the best way to fix the problem so the bike can be reliable. But it is hard to think about that stuff when you want to ride and just do a build and thinking everything is good to go. I've had stuff like that happen to me before

First of all this is WAY cheaper than buying a whole 300 TPI engine, and what fun is that? This YZ300 is gonna scream!