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new to 85-86 lt's need help

5687 Views 32 Replies 7 Participants Last post by  NYJOER69
i have several lt250r's(87 and up) but i just got an 85...and so the saga begins . i got it for $350 complete but not runing so not a bad deal . flushed rad , cleaned tank and carb , changed oil. its got big fat blue spark and good compression 165-170lbs but coolant is finding its way into the cylinder :( i ordered a Tusk gasket set hoping its just the head gasket (i know they can be a pain in the butt) . my question is since there is no coolant in the oil is there a good chance its the gasket and not a cracked cylinder? should i pull the jug to inspect since im getting a new base gasket with the kit or should i just try the head gasket with the copper spray sealant first ? if the jug is cracked will it be obvious and easy to see or could it be microscopic or hidden ? When i kick it over with the plug out a fine mist comes out of the plug hole even with the carb off so i know its not gas flooding it it must be coolant . any tips about the pain in the butt head gasket would be great . i will check everything with a straight edge on all the contact surfaces and shave or deck it if need be . thanks in advance for any help i appreciate it , and will return the favor if anyone needs help with 87 and up lt's! Thanks Winkdogg
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Got the 86 SCREAMING !! I miss 6th gear buy it still rips in fifth . Put a Barnett Dirt Digger Kit in it the other day and she is screaming ! Still need to get the carb figured out , get some plastics , solder and shrink wrap some wiring and fix some of the last owners "rattle can " paint work but its coming along ! I guess I should just rip the carb apart and rebuild it the Idle screw is bottomed out and I need to twist out the cable adjuster at the twist grip to keep it running ?? and it still floods gas into the cylinder and pipe when its parked with the gas on so I guess I need to adjust the float or replace the seat if its not sealing up ?? It also randomly feels like its running out of gas at full throttle (again im guessing gunk in the carb) I only did a quicky clean up never really pulled it apart and went through it completely .. still need to score some plastics if anyone has a set!
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Tear the carb apart...especially, the bowl...prob. a bunch of dirt and junk in the bottom of the bowl causing the needle to hang up causing the flooding during idle and at full throttle prob. pulling the dirt into the jet seat causing it to run out of fuel or maybe the fuel pet-cock isn't flowing enough volume to feed the carb during full throttle runs.
Tear the carb apart...especially, the bowl...prob. a bunch of dirt and junk in the bottom of the bowl causing the needle to hang up causing the flooding during idle and at full throttle prob. pulling the dirt into the jet seat causing it to run out of fuel or maybe the fuel pet-cock isn't flowing enough volume to feed the carb during full throttle runs.


will do! I figure that and my tarnishing and taped wires are the problem so all the wiring will soldered and covered in marine heat shrink! Iant believe how burnt up cluth plates were quite possibly the original clutch! Ialso have atopend gasket set and dual stage reeds but waiting till it gets low on compression befor I do that. I need rebuild the kickstater the spring and balls are gone and the c clip on the top is too it falls of some times :)will rip car apart next day its over 45 degrees or when I can make room in the shop and fire up the wood burning barrel (55 gal drum) homemade :)

thanks windogg
Right on.
I had an issue with my 86 LT while trail riding, It would just die on me.
Found a wire melted thru because it was rubbing on the exhaust pipe, causing it to ground out.

Note to self... make sure the wiring harness is secure and not laying against the pipe!....LOL!!
Will Do!!

Right on.
I had an issue with my 86 LT while trail riding, It would just die on me.
Found a wire melted thru because it was rubbing on the exhaust pipe, causing it to ground out.

Note to self... make sure the wiring harness is secure and not laying against the pipe!....LOL!!
Yup im good with wires and I might just make a new harness and fish all the wires through the frame with rubber grommets in the holes to stop chaffing on the insulation! Plus it makes it look nicer :) But the carb has to get adjusted and cleaned out first . wont idle with screw all the way in I need to adjust it at the twist grip :( I will get to the bottom of it I have other carbs but they are all flat side I thought I had one round slide mukini! might be in a box somewhere !
I also think there might be an air leak at the idle screw it seems to mess with the mix when I start to unscrew it ?? can I put Teflon tape on the threads?

thx winkdogg!
I also think there might be an air leak at the idle screw it seems to mess with the mix when I start to unscrew it ?? can I put Teflon tape on the threads?

thx winkdogg!

If you've got your carb idle screw AND your throttle cable adjustment nut both pegged to keep idle down, you've either got an air leak or else carb tuning issues.

Do a leakdown test.
-And-
Verify the carb settings (pilot jet, main jet, adjustments) are factory. It will give you a good baseline at least.
-And-
Ensure all of the cylinder and head studs are torqued to spec.

Don't run the engine again until you've proven the engine isn't leaking air between the carb and the exhaust flange. It should hold 7psi for 7minutes without much drop at all (my own rule). There is no powervalve in this engine, so no worries about pvalve o-rings leaking. I don't remember if the 85-86's have a crankcase vent tube to plug...but if you are getting air through your crank vent tube it means you are leaking at the crank seals or balancer seal.
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I own several lt 250rs I have had to split cases after a leakdown this one holds 8 lbs for 10+ min no problem . I only need to adjust the cable out a tiny bit to get the slide open enough to idle .The idle screw could be warn down from 25 years of use and its just not opening the slide enough , I know the screws are made of brass or bronze and it might just be worn to the point that its too thin to open the slide . I will also try to compare the screw to a screw from a different carb . I have searched for air leaks with starting fluid and propane no leaks near carb or intake . I need to pull the carb apart to adjust the float so hopefully its just gunked up and a good cleaning will help . I know its jetted right bc I know the bike ran fine before it sat for a few years and hasn't changed any performance parts . If the reeds are bad I know that can cause some issues but I just csant bring myself to pull the jug until I really need to :) It does leak a bit around the exhaust at the front of the motor I need to put a new steel seal in it (which I have and I need to weld the bolt tab back on the expansion chamber and get a better spring to pull the exhaust tight . I never thought about an exhaust leak messing with the idle but I suppose anything is possible ! I will check it out Thank You!
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You might hold a match over the plug hole when you kick it over to double check whether it’s gas or not.
You also might try to retorque the head studs to see if you have any stripped threads.
Suzuki cylinders have a rather robust iron sleeve, I’ve never seen one with a crack which would cause a coolant leak
Somebody else may have some other ideas.
Change the clutch cover gasket that gasket happens to seal the water pump coolint from mixing in with the oil
i have several lt250r's(87 and up) but i just got an 85...and so the saga begins . i got it for $350 complete but not runing so not a bad deal . flushed rad , cleaned tank and carb , changed oil. its got big fat blue spark and good compression 165-170lbs but coolant is finding its way into the cylinder :( i ordered a Tusk gasket set hoping its just the head gasket (i know they can be a pain in the butt) . my question is since there is no coolant in the oil is there a good chance its the gasket and not a cracked cylinder? should i pull the jug to inspect since im getting a new base gasket with the kit or should i just try the head gasket with the copper spray sealant first ? if the jug is cracked will it be obvious and easy to see or could it be microscopic or hidden ? When i kick it over with the plug out a fine mist comes out of the plug hole even with the carb off so i know its not gas flooding it it must be coolant . any tips about the pain in the butt head gasket would be great . i will check everything with a straight edge on all the contact surfaces and shave or deck it if need be . thanks in advance for any help i appreciate it , and will return the favor if anyone needs help with 87 and up lt's! Thanks Winkdogg
clutch cover gasket no good the anti freeze is mixing in with the oil pretty sure that's your problem or who ever rebuilt it out the head gasket on wrong
clutch cover gasket no good the anti freeze is mixing in with the oil pretty sure that's your problem or who ever rebuilt it out the head gasket on wrong
I build these quads so ask any questions you want and I'll give you a acute answer
i have several lt250r's(87 and up) but i just got an 85...and so the saga begins . i got it for $350 complete but not runing so not a bad deal . flushed rad , cleaned tank and carb , changed oil. its got big fat blue spark and good compression 165-170lbs but coolant is finding its way into the cylinder :( i ordered a Tusk gasket set hoping its just the head gasket (i know they can be a pain in the butt) . my question is since there is no coolant in the oil is there a good chance its the gasket and not a cracked cylinder? should i pull the jug to inspect since im getting a new base gasket with the kit or should i just try the head gasket with the copper spray sealant first ? if the jug is cracked will it be obvious and easy to see or could it be microscopic or hidden ? When i kick it over with the plug out a fine mist comes out of the plug hole even with the carb off so i know its not gas flooding it it must be coolant . any tips about the pain in the butt head gasket would be great . i will check everything with a straight edge on all the contact surfaces and shave or deck it if need be . thanks in advance for any help i appreciate it , and will return the favor if anyone needs help with 87 and up lt's! Thanks Winkdogg
Probably the head gasket just changed the head gasket
i have several lt250r's(87 and up) but i just got an 85...and so the saga begins . i got it for $350 complete but not runing so not a bad deal . flushed rad , cleaned tank and carb , changed oil. its got big fat blue spark and good compression 165-170lbs but coolant is finding its way into the cylinder :( i ordered a Tusk gasket set hoping its just the head gasket (i know they can be a pain in the butt) . my question is since there is no coolant in the oil is there a good chance its the gasket and not a cracked cylinder? should i pull the jug to inspect since im getting a new base gasket with the kit or should i just try the head gasket with the copper spray sealant first ? if the jug is cracked will it be obvious and easy to see or could it be microscopic or hidden ? When i kick it over with the plug out a fine mist comes out of the plug hole even with the carb off so i know its not gas flooding it it must be coolant . any tips about the pain in the butt head gasket would be great . i will check everything with a straight edge on all the contact surfaces and shave or deck it if need be . thanks in advance for any help i appreciate it , and will return the favor if anyone needs help with 87 and up lt's! Thanks Winkdogg
Hello, I was seeing if the 86 lt230s quadsport stator cover is the same on a 89 lt250s quadsport?
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