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Yamaha YFZ450 oil upgrade
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Product Code: OU-100

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Description Installation Instructions
New from J & T Products - The Yamaha YFZ 450 Oil Upgrade is a permanent and professional bolt-on solution to the flawed oil design plaguing '04, '05, & '06 YFZ450 owners. As many have (suddenly and expensively) discovered, Yamaha used a poor and ineffective 'splash design' system for lubricating the wrist pin and piston rod bearing on their YFZ450 ATVs (model years '04-'06). Yamaha has since addressed this issue on their '07 models by utilizing a high velocity oil pump and an oil nozzle dedicated to lubricating these critical areas. J & T Products has developed a do-it-yourself bolt-on kit to upgrade your YFZ oiling system to perfectly match the '07 YFZ oiling system.
You simply send your clutch case cover to J & T Products where it will be professionally machine-modified, retrofitted with the ’07 Yamaha oil nozzle, and quickly returned to you with the high velocity oil pump, new case gasket, and new circlip. Upon purchase, J & T Products will immediately make available to you comprehensive, color illustrated, step by step instructions to perform all mechanical work. The procedure can be performed with minimal mechanical skill and basic tools. All work performed by J & T Products will be done by a certified Yamaha factory trained technician and experienced professional machinist. J & T Products uses only genuine Yamaha parts where applicable. All workmanship guaranteed.
How important is this? The motor failures have been initiated in one of two separate areas- the wrist pin (connects the piston to the rod) and the rod bearing (where the piston rod connects to the crank). The moment the wrist pin receives insufficient lubrication during high rpm, it “welds” itself to the piston, breaking either the piston or connecting rod and turning the motor into a weapon against itself. The rod bearing failure at the crank is more of a gradual process. Insufficient lubrication here causes the bearings to wear, weaken, and ultimately self-destruct- which will cock the piston in the cylinder during operation. In both cases, significant damage is done to the piston, cylinder, rod, and crank. We have seen several cases where additional damage was done. It’s important to note, there appears to be no “ safe point” for one to reach- these motor failures are occurring anywhere from the first 10 hours of use to after 3 plus years of riding. We have even seen cases where it happened more than once to the same YFZ. The average cost of a top and bottom end rebuild is over $2000.
How important is this upgrade? You decide. “Oil Mod” vs. “Oil Upgrade” Is this “oil upgrade” different or better than the “oil mod” that became popular on internet forums? Absolutely. The "oil mod" was basically an emergency fix to the oil problem. The “mod” requires complete engine removal, the cases split, and a series of channels drilled in multiple areas. The jet used with the mod is set lower in the motor farther away from both it’s source (freshly filtered oil) and it’s target (wrist pin). In addition, the “mod” not only fails to utilize the new high velocity oil pump, it actually LOWERS oil pressure as a result of the additional channels. The “oil upgrade”, designed by Yamaha, is a more efficient and effective design patterned after the “oil mod”. The nozzle is located immediately after the oil filter (freshly filtered) and utilizes Yamaha’s new high velocity oil pump. The mechanical work, with J & T Product’s step by step illustrated instructions, can be completed in a short amount of time with minimal mechanical skill.
What is the turn around time? In most cases, the modification will be completed and returned within one day from the day the case cover is received. We use UPS as the carrier most often for our domestic shipments and USPS for most international shipments. J & T Products is located in Lapeer, Michigan.
OK, I want it. What do I do? You can purchase the kit and view a printer friendly copy of our comprehensive illustrated instructions from this website.
Upon purchase, please send your clutch case cover (see installation instructions tab at top of page), and other information including: The name it was purchased under, a contact phone number and the address where you would like it returned to to:
J & T Products, 2475 Tomahawk Dr., Lapeer, MI. 48446
How do I view the installation instructions?
Click on the Installation Instructions tab at the top of this page.


If your motor has had a rod failure, it is important to replace the rotor assembly gears that attach to the oil pump. The rotor gears are highly precision and any metal shaving will scar the surface of the gears causing the gear to bind. The purpose of the rotor gears is to pull any oil out of the bottom of the motor and feed it to the oil pump to be delivered to the internals of the motor. Upon checkout of your YFZ 450 Oil Upgrade, click on “YES” to add a rotor gear assembly to your order.

J & T Products is now offering a water pump rebuild kit as an option with your YFZ 450 Oil Upgrade purchase. We use all OEM replacement parts. The aftermarkert water pump rebuild kits are poor quality and have a lot of bad reviews. You get what you pay for. Installation is free if purchased with the YFZ 450 Oil Upgrade. Upon checkout of your YFZ 450 Oil Upgrade, click on "YES" to add a water pump rebuild kit to your order.

Due to a mid-production casting change by Yamaha, a limited number of early 2004 YFZ450's have a clutch side case cover that WILL NOT accept the new ’07 Yamaha oil nozzle. J & T Products has developed a high quality oil nozzle that will be used on these limited number of units. The nozzle will operate exactly as the Yamaha nozzle. This 2004 early nozzle can also be use with all big bore pistons and stroker cranks. We also have a different nozzle for later 2004 - current YFZ models with stroker cranks, if not the piston will hit the stock style nozzle. Please email or send a note with your case to notify us so we know to use the correct nozzle. There is no extra charge for requesting the stroker nozzles.
  • Professionally machine-modified case.
  • New Yamaha Oil Nozzle upgrade.
  • New Yamaha high velocity oil pump.
  • New Yamaha case gasket.
  • New Yamaha circlip.
  • Step by step instructions for all mechanical work.

Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 12 Write a review.

  0 of 0 people found the following review helpful:
5 of 5 awesome service October 15, 2015
Reviewer: nathan west from raytown, MO United States  
I would highly reccomend jt products to anyone. I blew up my yfz due to the bad oil pump i sent my case in to todd and he had my stuff shipped back right away took longer for the shipping then i waited for them to get my stuff. After i received my case back it was in the same exact shape the oil upgrade looked fantastic and very clean. I would definitely  spend the money and have it done right so choose this place.

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  0 of 0 people found the following review helpful:
5 of 5 yfz 450 oil upgrade January 27, 2014
Reviewer: Jonathan P from horseheads, NY United States  
I had debated whether to go through and send the case out to let j and t do the upgrade. I made a good decision and bought the upgrade. my Yfz blew and had total failure case, rod, top end, and this was one step I needed to take to put it back together. J a T did it as soon as it go to the place. They then sent it back the next day! I was very happy and surprised how quickly and easily they did the upgrade. thanks  J and T excellent work! I definitely recommend this to anyone needing the upgrade! do it right with J and T products!!

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  0 of 0 people found the following review helpful:
5 of 5 Great machine work and really awesome person January 7, 2014
Reviewer: Terry Bell from Romulus, MI United States  
J&T products was a life saver for me and my yfz 450.
I was going on a trip and was looking for a solid fix to my leaking water pump and to get my case fitted to use the 2007 oil pump setup. When I got the case off the previous owner had put two of the long bolts in the wrong holes busting the backside of the case out where the screws were put back in. Overall J&T products fixed my case issues and water pump issues within a day of dropping it off to them and was able to pick it up the next morning. J&T products was very helpful in many ways including educating me about my machine and things to do to make it the best ride every time I ride.Thanks for all of you quick and reliable fixes to my yfz 450 it runs like a new machine.

To anyone out there that has a 2004-2006 yfz 450 and you need the oil upgrade don't risk it by going else where this guy is pro at what he does and it will show once you put your new case nozzle upgrade on the quad.

Thanks, Terry

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  0 of 0 people found the following review helpful:
5 of 5 '05 YFZ 450 August 26, 2013
Reviewer: RJ from Salem, OR United States  
I definitely recommend these folks to anyone needing the YFZ450 oil upgrade.  Quick turn around on shipping, easy to do  I had everything back together and riding in the same day.  Thanks J&T, you saved me time and money.

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  0 of 0 people found the following review helpful:
5 of 5 Oil upgrade March 9, 2013
Reviewer: tom olivo from el cajon, CA United States  
The whole process could not have gone any smoother. They received my parts, finished the work and had my parts on their way back the same day. Their detailed instructions were spot on. Would definitely recommend these folks to anyone needing the YFZ450 oil upgrade

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Yamaha YFZ 450 Oil Upgrade