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Here are some specs on the lt500 and lt250






Quadzilla Details & Specifications



The Suzuki LT500R "QuadRacer" is more commonly known as "Quadzilla" in the ATV community. It is the big brother to the smaller LT250R "QuadRacer". Both QuadRacer models share similar design features adapted to high-performance racing conditions and they each sport the same yellow and blue color scheme, but share very few components which are not interchangeable. The easiest way to differentiate these two models from a far is by identifying each QuadRacer's blue, radiator grille. The LT500R's grille features a single vertical vane through the center, while the LT250R's grille features two vanes that are oriented horizontally.

The Quadzilla was offered only during the 1987 through 1990 model years. This fact makes it difficult to acquire a Quadzilla from the used market, and very difficult to find one in new condition. The 1987 Quadzilla product was known as the "H" model, 1988 was "J", 1989 was "K", and in 1990 it was "L". For example, sometimes you will see a 1989 Quadzilla identified as an LT500RK. The 1987 "H" model appears
to have been sold in greater quantities than each following model year. This observation is ironic due to the fact that the 1987 model had a different powerplant than all of the following years. The 1988 "J" model featured the second-generation Quadzilla powerplant. This new engine appears to follow the same general specifications as its predecessor, however proof that it is different lies in the fact that components are not
interchangeable and transmission gear ratios are different. In 1989, the "K" model received some chassis refinements. These refinements' presence can be easily identified by white-colored A-arm front suspension, replacing the former silver-colored A-arms of previous years. In 1990, the "L" model received even fewer changes. I suspect the changes in 1990 were in response to manufacturing cost considerations.

The rear shock (damper) is manufactured to Suzuki specifications by Showa. This Showa damper used in the Quadzilla was found on Suzuki's RM line of MX bikes in as early as 1984. While the rear damper is rebuildable, the front dampers are not. Although the front dampers are not rebuildable, it is still possible to modify them to perform differently.

The Quadzilla remains, to this day, Suzuki's largest-displacement and greatest-powered ATV. A new Suzuki ATV model, not to be confused with the Quadzilla, was introduced in 1997. It is identified as the "LT-F500". This new ATV is not a member of the QuadRacer family, has a smaller engine displacement figure, and far less horsepower than the Quadzilla does.

Standard LT500R features include:

High-performance, liquid-cooled, reed-valve, two-stroke engine
Suzuki Automatic Exhaust Control (SAEC) power valve for more power at all RPMs
Rugged manual clutch and 5-speed, close-ratio, transmission
Responsive flat-slide Mikuni carburetor
Gear-driven counterbalancer for smooth engine operation
Strong, lightweight aluminum rims
"T-type" seat for added support when cornering
Large, bright 60/55-watt halogen headlight with high and low beams
Front shocks feature progressive-rate springs with adjustable preload and 4-way rebound damping adjustment
"Full-Floater" rising rate rear suspension with box-type aluminum swing arm, remote gas-charged damper, and adjustable preload, 21-way compression, and 26-way rebound adjustments
Aerodynamic fenders
Optional LT500R features include:

Extra-wide front bumper
Lightweight, fiberglass skid plate

Suzuki Motor Corporation released the following specifications for the LT500R. As of this writing, only the wheelbase is confirmed slightly
different across model years.

Displacement: 499.5cc
Bore & Stroke: 86mm & 86mm
Compression: 7.2:1 (corrected 6.3:1)
Carburetor: Mikuni TM38SS, flat slide (stock #350 main)
Lubrication: Oil premix
Ignition: Suzuki PEI (CDI-type), 4° @ 1,000rpm, 12° @9,000rpm
Starter: Primary kick
Transmission: 5-speed, manual clutch, no reverse
Transmission ratios: primary 2.142 (60/28), 5th 0.909 (20/22), 4th 1.100 (22/20), 3rd 1.333 (24/18), 2nd 1.733 (26/15), 1st 2.416
(29/12), final 3.076 (40/13)
Final Drive: #520 chain, O-ring sealed
Overall Length: 1,920mm (75.6")
Overall Width: 1,205mm (47.4")
Overall Height: 1,110mm (43.7")
Seat Height: 790mm (31.1")
Wheelbase: 1,345mm (53.0")
Ground Clearance: 110mm (4.3"), at rear axle
Dry Weight: 178kg (392 lbs)
Fuel Tank Capacity: 13 liter (3.4 gal) including reserve
Front Wheels: AT21x7-10 fully corded tires on aluminum rims, using 4 on 166mm bolt pattern
Rear Wheels: AT20x11-10 fully corded tires on aluminum rims, using 5 on 130mm bolt pattern
Brakes: triple hydraulic disk, single piston caliper designs
Front Suspension Travel: 9.1", double A-arm with adjustable preload and 4-way rebound damping
Rear Suspension Travel: 9.1", "Full Floater" linkage, adjustable preload, 21-way compression, and 26-way rebound (SLR 2.11:1)
Caster: 10°
Camber:
Trail: 42mm (1.7")
Toe-in: 11-19mm (0.4-0.7")
Turning Radius: 2.8m (9.2')
Turning angles: 32° inside, 25° outside (±3°)
Fuel: 85 octane pump fuel (R+M)/2
Warranty: three-month





Suzuki LT250R Details & Specifications

In the middle 1980s, Suzuki had different ideas of what an ATV should be. Other motorcycle manufacturers had already produced ATVs in the form of three wheelers for a number of years and now had progressed to a point where high-performance two-stroke ATVs were popular. In defiance to the ATV trend of that time, Suzuki's first high-performance ATV was produced having four wheels, instead of only three. The Suzuki QuadRacer marked the beginning of the high-performance Quad era.

The Suzuki LT250R "QuadRacer" is the little brother to the larger LT500R "QuadRacer". Both QuadRacer models share similar design features adapted to high-performance racing conditions and they each sport the same yellow and blue color scheme, but share very few components which are not interchangeable. The easiest way to differentiate these two models from a far is by identifying each QuadRacer's blue, radiator grille. The LT250R's grille features two vanes that are oriented horizontally, while the LT500R's grille features a single vertical vane through the center.

The LT250R was offered only during the 1985 through 1992 model years. The earliest generation of LT250Rs (1985-86) can be identified by their dark-looking aluminum engines. Starting with 1987, LT250Rs were manufactured with their engines painted blue and were equipped, for the first time, with gear-driven counter balance shafts and SAEC power valve designs. The last few model years of the LT250R can be identified by their new rear suspension linkage. While earlier LT250Rs has the "push rod and see-saw"-styled Full Floater suspension, the latest ones had a compact linkage nestled in the swingarm, similar to all modern Suzuki Full Floater designs.

Standard features for the 1988 LT250R include:

High-performance, liquid-cooled, reed-valve, two-stroke engine
Suzuki Automatic Exhaust Control (SAEC) power valve for more power at all RPMs
Rugged manual clutch and 6-speed, close-ratio, transmission
Responsive flat-slide Mikuni carburetor
Gear-driven counterbalancer for smooth engine operation
Strong, lightweight aluminum rims
"T-type" seat for added support when cornering
Large, bright 60/55-watt halogen headlight with high and low beams
Front shocks feature progressive-rate springs with adjustable 5-way preload and 4-way rebound damping adjustment
"Full Floater" rear suspension with box-type aluminum swing arm, remote gas-charged damper, and adjustable preload, 4-way compression, and 4-way rebound adjustments
Aerodynamic fenders

Suzuki Motor Corporation released the following specifications for the 1988 LT250R.

Displacement: 246.0cc

Bore & Stroke: 67mm & 70mm

Compression: 8.0:1

Carburetor: Mikuni TM34SS, flat slide

Lubrication: Oil premix

Ignition: Suzuki PEI (CDI-type)

Starter: Primary kick

Transmission: 6-speed, manual clutch, no reverse

Final Drive: #520 chain, O-ring sealed

Overall Length: 1,830mm (72.0")

Overall Width: 1,135mm (44.7")

Overall Height: 1,125mm (44.3")

Seat Height: 780mm (30.7")

Wheelbase: 1,280mm (50.4")

Ground Clearance: 125mm (4.9"), at rear axle

Dry Weight: 147kg (324 lbs)

Fuel Tank Capacity: 11.5 liter (3.0 gal) including reserve

Front Wheels: AT21x7-10 fully corded tires on aluminum rims, using 4 on 166mm bolt pattern

Rear Wheels: AT21x10-10 fully corded tires on aluminum rims, using 5 on 130mm bolt pattern

Brakes: triple hydraulic disk, single piston caliper designs

Front Suspension Travel: 8.7", double A-arm with adjustable preload and 4-way rebound damping

Rear Suspension Travel: 8.7", "Full Floater" linkage with fully adjustable preload

Caster: 9°

Trail: 40mm

Toe-in: 11mm to 19mm, with 165 LB rider aboard

Turning Radius: 3.0m (9.8')

Rear shock leverage ratio:

Fuel: gasoline, pump fuel

Warranty: three-month
 

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These are the basic MUST do RX fixes on your Zilla, with the cylinder head RX being the most critical of any Zilla motor. Once you solve the detonation problem, you greatly increase the life of the case bearings, flywheel, etc.

I just got my 87 motor back from the Good Doctor and Pete ( it was a very low hour motor to begin with) and it DID NOT require the case inserts! No scare tactics to make me do it, just always good advise as to where to spend my money wisely!! That's what I really like about the Guy!!

I'll post a full review on this full tilt RX'd and modded motor after I get the 250/500 hybrid up and running after it's debut flattrack race Nov 4th in Ocala.

Jim
 

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coolhead

which coolhead is better the one that uses the original head gaskets or one with o-rings to replace head gaskets. at first i liked the idea of no gaskets but are these prone to leak? any brands you recomend: motion pro or trudor
 

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forgot to ask

i forgot to ask, how could i tell if i have a leaned out engine. 87 lt500r, it works perfect but on a 150 main jet (39 pwk keihin) all stock motor. i was thinking the lean jet could be due to a weak spark. would an air leak test determine if the engine is leaned out or how can i find out. thanks
 

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Discussion Starter #9
im no pro but look at ur spark plug ...if its white or a lighter colour ...its lean ..im not mehcanic but i thinks thats right or its completly opposite

Z
 

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With all of these bike being so old now and few of them being owned by the original owners how do you know what mods have been done already?
 

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IMO if your unsure of what has or has not been done to it tear it down & inspect everything gaskets & seals are cheap insurance on a unknown quad
 

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OK well those specs on machining the head and setting thwe squish tell ME jack squat. Who can do this for me? thats the only thing I have left to do to mine
 

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Who in southern California is a competent LT500 builder, I am the original owner of a 89' 500 that needs some of these fixes, just want it reliable, with a pipe - is that two much to ask, in seven years of active use it's blown up at least four times. I want a motor that can go for many 30~40hr seasons

BTW - I'm in the SD area
 

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Discussion Starter #15
Suzuki Quadzilla lt500r is an all-terrain vehicle (ATV) built by Suzuki from 1987 to 1992.

The suzuki quadzilla 500 motor is known as one of the most powerful motors in quads of all time.The water cooled 500cc 2 stroke motor is frequlently being rebuilt and made into a racing machine.The bike was built off its smaller longer lasting suzuki lt250r brother but being upped 250 cc.Desipite only being made from 1987 to 1992 the demise of this style bike the suzuki quadzilla is still well known amongst quad enthusists today.The lt250r is known as the first racing quad and the quadzilla was known as the first bike with 4 wheels of this size.It in stock form rebuilt is capable of beating a banshee,700 raptor and a ds650.It is a very powerful long bike and in stock form is yellow wiht a blue hood.

Retrieved from "http://en.wikipedia.org/wiki/Suzuki_lt500r"
 

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I've got a 39pwk also and I run a 158 at 2000 feet elev but I still think I could go leaner
still in prototype stage AKA... monkey [email protected]#$%$ a football...lol
that bigger carb gives me more low end am i right or is it just me???
 
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