What would you do if you had 2000$ to spend on a Quadzilla motor and you wanted the most power possible on pump gas. Starting with a stock motor.

This is what I’m thinking right now, but I’ve got a while to think about it.

Trinity stage 3 kit ------------------------------------------------940$ with chrome pipe

-Trinity pipe+ silencer
-Porting
-44mm Mikuni carb
-K+N filter

V force reed cage -----------------------------------------------150$
Billet cylinder head
with the smallest dome I can run pump gas with---------250$
ProLite piston with Trinity’s piston mod---------------------135$

That’s puts me just under 1500$ which is good because I could then spend more on the rest of the quad.

 

Send your motor to Tudor in California to have the case halfs machined and resleeved before you rebuild it will save you from having to do case bearings and crank bearings for years. Check out there website for more information. www.tudorsperformance.com I think. My buddy just had his done and He is going to post pictures soon on this website. "http://www.everything2stroke.com"

 

You can't put V Force reeds in an 87 jug...only FMF makes reeds to fit that year. 88 to 90 has a smaller cage and somewhat less HP!!!!!

 

Also since you have the 87 head either replace it with an 88 or newer or get the head studs inlarged. The 87 has an issue with to much compression and not enough force to hold the head on the studs with start to thread out. Tudors can also do a head stud mod for you too. New cylinder is a nice way to go to but will cost you $500

 

The top end is the newer 88-90 jug. It was upgraded by a previous owner. I should have included that. If I'm lucky, they may have had the bearings done too.

 

I agree with Banshee2003, get the case split and the crank slop fixed. This is a must if you are going to do motor work or you will be back at square one .

I would say that a 44 carb is a liitle big, 41s will work great unless it is a drag bike.

Make sure you get the CoolHead wtith the Oring gasket.

Good Luck!!!

LATER

 

Hi Tom,

Here's my $.02 worth. It's merely my opinion but may prove valuable to you.

I'm building my 4th 500 motor this fall, after many many hours of study (2-stroke theory, etc.) I will be doing my own motor work. I'm not a machinist so I have to send my parts out to a shop, but I will be doing my own port work, my own pipe design, and my own assembly.
I use TSR software and model all porting work/pipe design, etc.
There are MANY design shortfalls with the 500's that need to be corrected before a strong reliable motor can be built. (I won't elaborate on these, PM me if you'd like a list)
Pump gas and 500's don't go well together... even in stock form detonation is a problem.

I cringe when I see folks thinking about throwing big $$ at the big name shops for their mods.
You should be able to build at LEAST two 500 motors for the kind of $$$ you're talking about!
You might also do some research on a builder before you send your precious motor to them... for example, do a search on this thread to see what others think of Tudors, trinity, etc. call them and ask for references, and just visit about turn-around time, warranty, etc.
Ask why they do what they do... A good builder will take the time to explain what they do, and why.

Trinity built a motor for me back in the early 90's... was I satisfied? Nope! Would they help me with problems I had after the motor ran for 5 minutes? Nope! Good customer service? Nope!
Would I let them work on my son's tricycle? Nope!
Once they had my money, I was like a fly in the ointment.

I have purchased a few gaskets from Jeff Tudor, that went pretty well, decent delivery time, etc... But Ive heard horror stories about his turn-around time, etc. on his motor work.
Again, do your homework!
I've found there aren't many shops that work on the 500, and even fewer that know what they are doing.
I do have a guy local to me that I could hook you up with if you are interested. He's a small time tuner that builds 3-4 motors per year. (Not his day job) but he would be the ONLY shop I could recommend with any conscience.

Good luck to you.

 

Great Advice DuneAddict!!

 

Gonna go with Duneaddict on this one. The larger "puppy" shops have lost all of my business. Go with a smaller, indipendent builder as they give greater attention to detail and offer more in terms of personal service. I would suggest Eric Gorr. He is one of the best around, very knowlegable and an overall great guy. His prices are far more reasonable than the larger shops and his turnaround rate is far superior. Even if you dont choose him, I would still suggest a smaller builder. His site is Ericgorr.com. Check it out.

As far as mods I would suggest a 41.5 carb, Good pipe such as the LRD (considering you can find one), a decent overall port job, and a Cool head. I know people that have made 60hp on this combo, and it is very reliable. You can run 93 octane on this, but I would highly suggest 100 octane, if you buy it by the drum, its not that expensive.

 

You know, Duneaddict, I couldn't agree more. I'm glad to see some guys are starting to see the light. The aftermarket companies can't afford to spend the time to make a fast motor. They rely on peoples fear of the "black magic" art of tuning to keep people comming back. Look at peoples signatures. " I have stage whatever from whoever, I'm fast".
The problem is that most people don't know how or are afraid to build there own engines. That leaves them wasting money on magazine advertisements. Perfect example is the cool head. What can we do?
Anyway, Tom, I'm sorry I got side tracked. It's a sore subject. I think the best thing for the 500 is what is already metioned. Crank bearing sleeves, V- force reeds, and a little more compression. As for porting, unless you really plan on cutting and moving stuff around (which a stage whatever kit wont do), a wider exhaust port is all it needs. The heights are really nice for most riding. Despite what everyone says, it's a very reliable quad when assembled correctly.