The Yamaha blaster oil injection system is a VERY well designed system. I've ran it with a modified engine for years!
Piped, ported cylinder, re-chambered high compression head,etc. Never an issue.
Please don't fall for all the internet bullshit about how the system always fails, and engines burn up. Its completely unfounded. A good reson to remove it would be because you have other atv's or motorcycles you pre-mix fuel for. That, and you want to shave a pound off of your blaster. There is nothing wrong with removing it either. That's entirely up to you, but don't do it just because someone says, "the system always fails". complete bullsh&t.
The only failure that the oil injection system faces is "Operator error"... such as NOT FILLING THE OIL TANK. I know it happens, and that is why I pick up blasters cheap.
You can see if tank needs filling from 100 feet away.
The plastic gear does not fail. It is under very little stress and runs nice and silent. There is no need for a metal gear. If it required a metal gear, Yamaha would have put one in there.
This is from another post about oil injection. Keeping, or removing it...
\/ \/ \/ \/ \/ \/ \/
Both systems work great! All you have to do is pick one.
Don't fall for all the bullsh*t on the internet about how the oil injection fails, the drive gear breaks, etc,etc.
A spill or flip has never upset anything for me. Its going to take a whole lot more to mess up the system than that.
What screws up the oil injection system and causes failures? LAZINESS and IGNORANCE!
Its pretty much maintenance free and requires the user to do nothing more than keep the oil tank topped up with oil. How hard is that? For some folks its pretty hard to do. These are the same dummies that don't know how to tie their own shoes. These are also the same individuals that never warm up the engine, never clean their
air filter, lube the chain and cables, change the transmission oil, check air pressure in the tires, use fresh quality fuel, leak test, etc, etc. However, they are the first to blame the oil injection system when the engine melts down. Ignorance costs money! Common sense always prevails if you use it... and is FREE (if you have any).
The oil injection system will EASILY support a modified engine. I run it with porting, high compression/re-chambered head, pipe, etc.
As for removing oil injection... this works too! Nothing wrong with doing it as long as its done CORRECTLY!
Removal of the system will lighten your blaster by about a pound for all the components not including the oil in the tank. It also gives it a bit cleaner look. The main advantage is if you have other two stroke toys that you pre-mix fuel for. If you pre-mix the same ratio for all your other toys, you won't have to carry regular gas too.
DO NOT DO A HALF ASS REMOVAL OF THE OIL INJECTION SYSTEM!
Do it once and do it CORRECTLY!
I've seen too many morons just run the tank dry then just start running pre-mix and do nothing else. This is why they are called morons.
Get yourself a block off plate and completely remove the oil pump, or if your on a budget its ok to just remove the drive gear. Both will require a fresh gasket for the clutch side of the engine, but that's ok , because you were going to change your transmission oil and inspect the internal components anyway while you were in there. right?
GOOD LUCK!
Read more:
http://www.blasterforum.com/threads/pre-mix-or-oil-injected.63545/#ixzz3zW4dDEzZ
