Author Topic: 86 lt250r w/89 crank and rod (Read 3223 times)

86quadracer · « **on:** December 24, 2013, 11:40:46 pm »

I have a lightened 89 crank and rod sitting around can I put it in a 86 case ?

SBLT500R · « **Reply #1 on:** December 25, 2013, 08:38:45 am »

no 85 86 use a different crank. no way to make it work.

86quadracer · « **Reply #2 on:** December 25, 2013, 09:31:12 am »

Can u explain what is diff about them

LT250RWV · « **Reply #3 on:** December 25, 2013, 11:06:06 am »

Rod lenght is one. Their are just alot different.

86quadracer · « **Reply #4 on:** December 25, 2013, 11:28:50 am »

I knew the rod length was diff but I was wondering why it won't work when the bearing is the same

LT250RWV · « **Reply #5 on:** December 25, 2013, 01:33:00 pm »

Does the 86 have spacers on it

LT250RWV · « **Reply #6 on:** December 25, 2013, 01:49:09 pm »

The water pump from the years you have will not work together. They both attached to clutch side of the cranks

86quadracer · « **Reply #7 on:** December 25, 2013, 05:39:01 pm »

I'm not talking about waterpump

86quadracer · « **Reply #8 on:** December 25, 2013, 05:40:34 pm »

What's the best way to build a long rod motor from an 86

Dutch_Rutter · « **Reply #9 on:** December 25, 2013, 06:31:16 pm »

To be honest its not really worth trying to build a performance 85-86 motor. Most machine shops won't port that motor for you. So even if you were able to do a long rod set up, you'll never be able to let that power roll out of the motor. If that makes sense? Your so much better off getting a 87+ motor and rebuilding that. They are so much more versatile and buildable. The newer motors can actually hold up to porting and can be made into some real power houses.

But if you are set on building the 85-86 let me know cuz i have a complete motor that ill make you a killer deal on.

PCS · « **Reply #10 on:** December 26, 2013, 11:41:45 am »

If u want to build an 86 i would go for it. Not trying to smack talk but what Dutch said but that is what the Honda/Yamaha guys say about the Suzuki 2 strokes in general since those engines have larger aftermarket and make more power easier plus very reliable. Where the its a will their is a way. Only problem is that the way u choose can be very $$$. I would contact some of our engine builders here and elsewhere to discuss your project and see of they want to help make it happen. Imo if u are trying to build any LT250/500 u are already building something that isn't "worth it" but that is also what makes it fun and unique.

LT250RWV · « **Reply #11 on:** December 26, 2013, 12:21:08 pm »

I dont think he meant that Pcs. What kind of performance you looking to gain 86

Dutch_Rutter · « **Reply #12 on:** December 26, 2013, 04:35:25 pm »

Sorry if it sounded that I was putting your plan down. Thats not what I mean at all, to be honest anyone who buys any atv is never going to get anywhere near their purchase price, or add on parts price if they try to resale it. We dont put $$$$ into these bike to make a profit, we do it because we love our 20 year old, outdated, money pit bikes.

I do have to admit, it would of been sweet to build my 85-86 motor up, But it would also been very discouraging when It grenaded shortly after I got it. $:-\$

I tell you what though, (light bulb went off in my head) since I have both years of motors pulled apart, I'll "mock up" what your talking about. I will put my 90 crank in my 86 cases and see if I can make something work for you, by switching jugs, and seeing how much if any kind of spacer would be needed. I'll post up some pics when I get this tested tonight.

86quadracer · « **Reply #13 on:** December 26, 2013, 04:41:53 pm »

Sounds good send the pics to my cell u have my number from yesterday

PCS · « **Reply #14 on:** December 26, 2013, 09:13:22 pm »

dutch i didnt think you were trying to put him down, just if i was 86qr, i might have taken it as why bother building the 85/86. like i said, 2 smoke zuki's arent considered to be great platform engines when it comes to the masses. team red/blue are...why else would they have such a large aftermarket support. Going fast takes $$$$ no matter what you build, just a matter of how much you want to spend

more so if you want to build any suzuki that has LT in the the name.
Good Luck

MotorGeek - Jerry Hall · « **Reply #15 on:** December 27, 2013, 07:07:22 am »

The 85/85 engine needs a special "twisted skirt piston" because the cylinder is twisted on the cases. Does the ends of the crank use the same spline for the gear that drives the clutch? Are the cranks the same width and outside diameter?

I assume you are wanting to swap cranks to save money. If any of the above are an issue, you will spend more money making the late model crank work than it would cost to buy or rebuild the 85/85 crank.

86quadracer · « **Reply #16 on:** December 27, 2013, 08:59:12 am »

Thanks motorgeek that's the kind of answer I was looking for

Dutch_Rutter · « **Reply #17 on:** December 27, 2013, 01:09:28 pm »

Thats what I was trying to say in a nut shell. OK guys, so I looked everything over, and I did not even try to put everything together, the newer crank is so much bigger in diameter then the older that it would not really fit into the cases that well.

LT250RWV · « **Reply #18 on:** December 27, 2013, 03:33:29 pm »

That is what I was trying to say and plus the water pump hook up to each crank totally different.

86quadracer · « **Reply #19 on:** December 27, 2013, 03:40:22 pm »

That's what I was trying to figure out thanks guys

Mgty3Whlr · « **Reply #20 on:** December 28, 2013, 10:49:49 am »

Hey guys!
The 85-86 crank is Totally different from the 87 and up years.
However, you can do a Long Rod motor on the 85-86 motors using the 88 rod.
But you need to use the 85-86 lower rod bearing (preferably new).
You will need to have a 8mm spacer plate made up (Cometic Gaskets) and 2 base gaskets (1 for the top and 1 for the lower of the spacer plate.
I did one and it runs really well.
Of course it doesn't compare to a modded 87 and up 250 but, it is a nice set up.
and runs very well, reliable too.
Joe

86quadracer · « **Reply #21 on:** December 28, 2013, 10:53:32 am »

Would the 89 rod work

Mgty3Whlr · « **Reply #22 on:** December 28, 2013, 11:53:49 am »

Yes, but you will need to order a 85-86 lower rod bearing and pin because the 88-92 lower pin is a different size.

86quadracer · « **Reply #23 on:** December 28, 2013, 11:57:29 am »

Okay thanks I will do that then. Can u pm me what all I will need to do the long rod 86?

Dezsled · « **Reply #24 on:** December 28, 2013, 12:18:19 pm »

Not many spacer plates made for these are there?

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Author Topic: 86 lt250r w/89 crank and rod (Read 3223 times)

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