87 250 with possible 88 interals?

87 250 with possible 88 interals?
Posted by Reb_250r on 02 Dec, 2013 18:16
Ok, I just bought an 87 model lt250r in pretty decent shape. Only thing wrong with it is the reeds which I have just ordered. I have not rode it yet. The guy I bought it from told me it was an 88 year model. How I found out it was an 87 is because I ordered 88 model reeds for it and, of course, they were wrong. So I ran the VIN number. And now I know 88 and 87 model reeds are different. Anyways he told me he just rebuilt the engine. Only thing that scares me is that could he of rebuilt the engine with an 88 model piston and crankshaft since he thought it was an 88? I know there are only minor differences between the 87 and 88-92 model 250s. Will it work? If so will it hurt the engine? I would ask him but no longer have his number.

#1 Reply
Posted by All American on 02 Dec, 2013 18:42
Don't quote me but I believe the reed cage was about the only difference.

#2 Reply
Posted by Reb_250r on 02 Dec, 2013 19:02
Well, on some of the website stores they have piston kits for 85-86, 87, and 88-92. So I think there may be a little difference.

#3 Reply
Posted by All American on 02 Dec, 2013 19:07
I wasn't totally sure. I have an 86' 250 but I haven't done any rebuilds myself. I know the 85' & 86' are completely different than all later models. I just bought a pos 88' that I was parted out because the motor I sent to a builder was trashed. The whole dang thing was a nightmare. LOL it was a good learning experience for me. We need someone else to chime in and answer this cause I know they know. Heck I'll go look through some old threads and find the answers probably.

#4 Reply
Posted by Chuckie25 on 02 Dec, 2013 19:16
All the internals are the same. The difference was with the intake on the cylinder. the 87 cylinder has the "big reed" 5-bolt intake, the 88+ the "small reed" 6-bolt intake. All other internal's the the same. after a certain year the 250's came with a factory "lightened" crank that looks like it has plugs drilled out of it but its still all the same measurements

#5 Reply
Posted by Reb_250r on 02 Dec, 2013 19:19
Ok. Thanks, guys. I also read that the 87 model was a littler faster than the 88-92 models due to the larger intake. Is this true?

#6 Reply
Posted by Kyle T on 02 Dec, 2013 19:39
Bunch of differences between the 87 and 88-92 engines.
Crank balancer (88+ has a lip on the magneto side)
Crank balancer oil seal (88+ has a bigger ID for the balancer lip)
Clutch cover (engine number 110185+ are different somehow, but the older one supersedes to it, so it can't be THAT different)
Clutch cover gasket (91+ is a different material)
Magneto cover gasket (91+ is a different material)
Sprocket cover bolt (flanged on 88+)
Sprocket cover bolt lock washers (not used on 88+)
Sprocket cover bolt washers (not used on 88+)
Piston (88+ has a semicircular intake cutaway)
Piston pin bearing washer (88+ has smaller ID to avoid breaking, a MUST for ALL QuadRacers)
Crankshaft assembly (88+ is made of several different parts)
RH crankshaft (88+ is a full circle with 4 holes in it)
LH crankshaft (88+ is a full circle with 4 holes in it)
Cylinder head (88+ has different internal specs)
Cylinder head gasket (88+ is different somehow, 91+ is a different material)
Spark plug (88+ use a B9EGV)
Cylinder (88+ has different internal specs and a different design intake/boost port)
Base gasket (91+ is a different material)
Exhaust valve cover gasket (91+ is a different material)
Reed valve assembly (88+ use a small 6 pedal)
Reed valve stoppers (88+ use small 6 pedal)
Reed valves (88+ use small 6 pedal)
Reed screws (88+ use 6)
Reed valve gasket (88+ use it)
Reed valve bolts (88+ use 6)
Intake manifold (88+ use a 6 bolt)
Gasket set (88+ are different, 91+ gaskets are a different material, includes different o-ring)
Exhaust valve spring (91+ is different somehow)
Exhaust valve holder internal O-ring (91+ is different somehow)
Gear shifting lever (91+ is different somehow, deals with the footguards)
Kick starter shaft (91+ is different somehow, but the older one supersedes to it, so it can't be THAT different)
Kick starter lever (91+ is different somehow, but the older one supersedes to it, so it can't be THAT different)
2nd drive gear (92 is different somehow, but the older one supersedes to it, so it can't be THAT different)
2nd driven gear (91+ is different somehow, but the older one supersedes to it, so it can't be THAT different)
3rd driven gear (91+ is different somehow, but the older one supersedes to it, so it can't be THAT different)

#7 Reply
Posted by Zilla273 on 02 Dec, 2013 19:45
Hmmmmmm, are u SURE U GOT IT ALL KYLE? LOL

#8 Reply
Posted by Reb_250r on 02 Dec, 2013 19:54
Ok, since you listed all that. Would an 88 piston and crank (if that's what's in it) hurt my engine that's an 87?

#9 Reply
Posted by Chuckie25 on 02 Dec, 2013 20:17
you'll be fine. Kyle is crazy and his LISTS are just of superficial things. Oh they changed the color of this screw by one milicrometer of coral blue #4? BETTER ADD IT TO THE LIST..

#10 Reply
Posted by Chuckie25 on 02 Dec, 2013 20:19
Quote
Crank balancer (88+ has a lip on the magneto side)
Crank balancer oil seal (88+ has a bigger ID for the balancer lip)

This is the only relevant part of that list that you need to know. but if its not leaking oil you'll be fine.

#11 Reply
Posted by Kyle T on 02 Dec, 2013 21:23
Yeah, I'm sure.

Reb, the 87 piston should stick with the 87 cylinder, and so with the 88-92. The crank doesn't give a hoot.

SUPERFICIAL? Wow. AW-ful big word there CJ. You know what it means?
Changed the color of the screw? Yeah? From chrome to chrome. They change CHASSIS SCREW COLOR, not ENGINE SCREW COLOR.
WT-FLYING-F IS A "MILICROMETER?!?!?!
Coral blue? Suzuki doesn't use that color. QuadRacers use Parsec Blue, Jeunesse Blue, Ultra Blue, Vivid Blue, Light Blue, Champion Blue, Marble Soldier Blue, Marble Parsec Blue, Super Blue, Super Blue Number 2, Dark Blue, AND Champion Blue Number 2. Tosser.
That's the reason they changed the balancer? Hmm...the design tells me different...

#12 Reply
Posted by LT250RWV on 02 Dec, 2013 21:58
The 87 piston is different. I always heard 87 piston to 87 jug . Not sure of different port timming is the reason.. when you take the reeds out snap a pic of the piston at the bottom of it. Someone here can tell ya.

#13 Reply
Posted by Chuckie25 on 02 Dec, 2013 22:30
Quote from: Kyle T on 02 Dec, 2013 21:23
Yeah, I'm sure.

Reb, the 87 piston should stick with the 87 cylinder, and so with the 88-92. The crank doesn't give a hoot.

SUPERFICIAL? Wow. AW-ful big word there CJ. You know what it means?
Changed the color of the screw? Yeah? From chrome to chrome. They change CHASSIS SCREW COLOR, not ENGINE SCREW COLOR.
WT-FLYING-F IS A "MILICROMETER?!?!?!
Coral blue? Suzuki doesn't use that color. QuadRacers use Parsec Blue, Jeunesse Blue, Ultra Blue, Vivid Blue, Light Blue, Champion Blue, Marble Soldier Blue, Marble Parsec Blue, Super Blue, Super Blue Number 2, Dark Blue, AND Champion Blue Number 2. Tosser.
That's the reason they changed the balancer? Hmm...the design tells me different...

Reb,, you're fine man. I ordered an 87 piston instead of an 88+ piston and im running the 87 piston in an 88+ jug.

Kyle if your lists are in any way shape or form useful why dont you tell us the EXACT DIFFERENCES IN THE PISTONS? I dont want "Piston is different somehow" blah blah blah. I want actual measurements and real info. THATS my problem with your lists is that they are useless without actual measurements or anything of the nature.

#14 Reply
Posted by All American on 03 Dec, 2013 11:39
I told you someone would know, now if we can agree. Lol jking

#15 Reply
Posted by Chuckie25 on 03 Dec, 2013 11:53
Ok i think i found the difference.

Quote
oh yeah the reson for the differnt crank and pston is this. the pin hieght on the 87 piston is different then teh later models and that in turn uses a little bit longer rod on the 87 also

Carl could tell us how accurate that is. It would seem like that if that were the case then an 88+ cylinder on to an 87 bottom end wouldnt be a direct bolt on swap right? I'm telling you, there cant be any huge differences in the pistons because of the fact that the cylinders just swap back and forth.

#16 Reply
Posted by Dutch_Rutter on 03 Dec, 2013 13:03
Not trying to get in the middle of anything but, cant you slowly crank the motor over by hand and feel if anything internally makes contact? if you are going to have any problem its going to be something along those lines. Not like a time bomb kind of an issue. I could be wrong though.

I would think that if you have good compression, do a quick leak down, and everything internally moves smoothly like it should. There wont be any issues.

#17 Reply
Posted by Chuckie25 on 03 Dec, 2013 13:26
Quote from: Dutch_Rutter on 03 Dec, 2013 13:03
Not trying to get in the middle of anything but, cant you slowly crank the motor over by hand and feel if anything internally makes contact? if you are going to have any problem its going to be something along those lines. Not like a time bomb kind of an issue. I could be wrong though.

I would think that if you have good compression, do a quick leak down, and everything internally moves smoothly like it should. There wont be any issues.

Thank you. That's what I'm saying.

#18 Reply
Posted by Kyle T on 03 Dec, 2013 17:38
You want actual measurements? SEND ME SOME PISTONS. Tell you what. You don't like my info? I just won't say from now on.

Nice picture by the way. DrunkBob WetPants with lipstick on. REAL good message for the KIDS who watch that show...Where's my "shaking head back and forth in disgust" smilie?!
Hmm. how 'bout this?

That info is probably for a HONDUH. The 87 TRX250R rods are 130.3mm, or 5mm longer, than the 125.3mm 85 and 86 ATC250R and 86 TRX250R. The rods ARE the same for all 87-92 LT250R at 128mm. How's that? Good enough for you?

#19 Reply
Posted by Chuckie25 on 03 Dec, 2013 18:07
I got that from a thread about 85/86, 87, 88-90, 91/92 LT differences from e2s.

I know that the Honda's had a long rod motor.

Why don't you just take and look in your big magic book for the measurements? Oh wait... It's just a bunch of superficial crap that anyone with google could figure out.

#20 Reply
Posted by Kyle T on 03 Dec, 2013 18:22
Why don't you look up on Google "How not to be a peckerhead".

#21 Reply
Posted by Chuckie25 on 03 Dec, 2013 18:33
Quote from: Kyle T on 03 Dec, 2013 18:22
Why don't you look up on Google "How not to be a peckerhead".

because you've worn poor google out with asking that same question that it just says "Shut UP Kyle!"

#22 Reply
Posted by Kyle T on 03 Dec, 2013 18:40
You sound a LOT like those guys who said the same thing about me YEARS ago. Where are they now? WHO KNOWS. I'M STILL HERE. And I'm going to be here LONG after you lil man.