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Author Topic: 87-92 LT250r engine Reliability Guide  (Read 4629 times)

Offline Nekrofilliak

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87-92 LT250r engine Reliability Guide
« on: March 08, 2013, 01:39:12 pm »
Hi, I want to everyone know the tips to build a reliable LT-250R  engine.
Most of tips come from Carl ( Iceracer )

LT250r 87-88 Reliability guide

Engine crankcase recommendation

sealant: Threebond 1194 only since silicone will get eaten by gasoline.
seal: use Loctite on every seal to prevent from moving
bearing: use oem only

Crankshaft recommendation

Never hammer on crankshaft, use special tool to remove
cold down the crankshaft before install to help seat on the engine bearing

Top end recommendation

Use Heavy duty thrust washer and RM bearing only
Be sure exhaust bridge is correctly relieved. ( see picture)

Gasket recommendation

Use OEM Head gasket only
Use Cometic aluminum base gasket number: B0047032AFM. Only then add Threebond 1194 to prevent leak
Use Threebond 1194 on intake gasket/boot to prevent leak

Piston recommendation

piston manufacturer: Wiseco only

To improve wrist pin bearing lubrication,
drill a 10 mm hole on the intake side centered 15 mm down the lower ring groove (see picture)

To improve exhaust bridge lubrication and prevent top ring seizure,
drill two centered 1.5-2.2 mm hole on the exhaust side, one centered between the two existing hole and one below the second existing hole at the same distance than first drilled (see picture)
88 Lt250r.
79 Lawnboy 21" ;-P

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Offline Dezsled

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Re: 87-92 LT250r engine Reliability Guide
« Reply #1 on: March 08, 2013, 01:52:52 pm »
Good info

87 HPR LT500
04 Roll LOBO II TRX250R
06 LTR450
87 LT500
85 & 86 LT250
86 & 87 TRX250R
07 & 09 Husqvarna TE450
00 CR125R

Offline LT250RWV

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Re: 87-92 LT250r engine Reliability Guide
« Reply #2 on: March 19, 2013, 06:37:19 pm »
Good info What about suzuki bond or yamaha brand  instead of the  Theerbond 1194 oe is it equal
91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

Offline BadMoonRacing500

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Re: 87-92 LT250r engine Reliability Guide
« Reply #3 on: March 19, 2013, 07:11:35 pm »
Good info What about suzuki bond or yamaha brand  instead of the  Theerbond 1194 oe is it equal
same
If brains were gasoline, you couldn't power a piss ant's go-cart 2 laps around a cheerio.

Offline James Dandy

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Re: 87-92 LT250r engine Reliability Guide
« Reply #4 on: September 26, 2013, 07:01:07 pm »
Love this thread. I started the alum washer VS YZ piston thread just to explore further. I knew it would get everybody involved. I'm definitely gonna use the aluminum washers. Not the re-pinned YZ deal. I was always a fan of cometic gaskets, so I'm gonna buy a cometic set, and an oem set. I'll make sure the cometic set has the aluminum base gasket. Great idea on the loktite seals. How much harder is it to remove loktited seals? I have a parts motor that the crank seal on the flywheel side had came part way out. When I noticed that I thought, there must be an adheisive to prevent that!

Offline Dangerouspower

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Re: 87-92 LT250r engine Reliability Guide
« Reply #5 on: October 01, 2013, 05:12:58 pm »
What gaskets are suggested besides oem head one and cometic aluminum base? 

Offline James Dandy

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Re: 87-92 LT250r engine Reliability Guide
« Reply #6 on: October 05, 2013, 06:53:34 pm »
Good question dangerous. I'm in the middle of my first LT motor, on all my dirtbikes, I only used cometic. They've always had a good rep. I'm going with exactly what this says to do tho. Unless somebody else chimes in here...

Offline Nekrofilliak

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Re: 87-92 LT250r engine Reliability Guide
« Reply #7 on: October 24, 2013, 12:02:05 pm »
maybe i am too late but, locktite on seal is mandatory , it is recommended by Suzuki  ans is witted in the service manual. for the head gasket. i recommended oem because the oem head gasket is covered with a thin rubber seal BUT , last time i order a oem head gasket it was not covered with rubber and was identical to the cometic . So i don't know if Suzuki still product the rubber covered head gasket ???

the aluminum cometic base gasket  is really a must , use it with case glue ( threebone) on both face. remember when using case glue , you must clean carefully before. apply a thin layer of glue on each surface , so for the base aluminum gasket you must apply glue on the gasket , under the gasket , on the engine crankcase and on the cylinder base . install the gasket and cylinder, lightly hand torque the bolt and wait 20 min , then torque to specification.

silicone not work hewer sine silicone will get eat by gasoline
88 Lt250r.
79 Lawnboy 21" ;-P

Offline Oh Four Z

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Re: 87-92 LT250r engine Reliability Guide
« Reply #8 on: December 12, 2013, 03:18:18 pm »
Posts like this are good.

Offline Kylerj133

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Re: 87-92 LT250r engine Reliability Guide
« Reply #9 on: March 22, 2015, 12:43:55 am »
anybody know were to get the cometic base gasket? I cant seem to find the part number thats listed..

Offline GrkGuy

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Re: 87-92 LT250r engine Reliability Guide
« Reply #10 on: March 22, 2015, 08:34:06 am »
 -TThey used to be in the site store, or just call them cometic, they are AMF gaskets. Just make sure you get right thickness for your bike.
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Redwhiteblue

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Re: 87-92 LT250r engine Reliability Guide
« Reply #11 on: August 09, 2015, 03:26:46 am »
Can somebody do the same thing for the 85' & 86'? [|]
1980  HONDA EXPRESS      NC50
1981  HONDA EXPRESS II   NA50
1985  SUZUKI LT250R        QUADRACER
1987  SUZUKI LT230EH      (WINTER PROJECT)
1987  SUZUKI LT230EH      (DONOR QUAD)
2013. HONDA TRX450ER     TRAILER QUEEN

 

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