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#125 Reply
Posted by
Dezsled
on 10 Dec, 2013 07:21
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My Zilla had galling exactly like that. I was told it was from the flywheel was not seated properly and the two parts needed to be replaced
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#126 Reply
Posted by
Iceracer
on 10 Dec, 2013 08:11
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If you crank bearing are moving around in the cases you better get them sent for inserts that's bad. They usually come out attached to the crank.
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You should share the story of my trashed 88' with these guys.
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Dezsled, ok, so I should also be looking into a new flywheel, is there a purpose to getting a lightened flywheel? or should I stick with stock. I do have a really good deal on machine work so it wouldnt be too bad to have any work done through him.
Iceracer, we were talking about you earlier on here. So Would I be better off getting inserts put into my cases or should I look for some replacement cases? not the cheapest route but its an option, I would like to keep it cheap since that cuts down on time that its in pieces, but still keeping it worthy of being rebuilt.
Or could it be that my bearings are just worn out because of the flywheel not being put on correctly?
I do love stories let hear about the 88
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#129 Reply
Posted by
Motoman991
on 10 Dec, 2013 10:43
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A flywheel stores rotational energy. It smooths the power delivery. A lighter flywheel will rev quicker, but also will drop revs quicker. A lighter flywheel will also reduce low end torque.
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So because I want this to be an all around bike I should probably stay away from that. Thanks for the education Motoman. Sorry about all the dumb questions, this is the first bike motor that I have ever tore down with the intent to rebuild it, so its a BIG learning curve for me.
So what would cause my bearings to be loose in my case? worn out bearings, or worn out cases?
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#131 Reply
Posted by
LT250RWV
on 10 Dec, 2013 12:53
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I have main bearing insert in my 91 lt250r. I done complete rebuild of my bottom end all oem sgp parts.. I have a build thread in the section members build. But my crank wobbled super bad back and fourth. It as either new cases or inserts. So I went new inserts. I had another set of 87 cases laying around as spares. 1 owner cases, bike was stock it whole life. Well the bearing inserts were bad in them to. So that why I went with inserts I didnt want to take a chance buy a used set with same problems. But inesrts will cost around 160 to 180$ per bearing pocket.
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Ok, So I should take my cases in and have them take a looka at doing inserts, I was looking at different cases on Ebay but, I think your right and they very well could be messed up too. Hopefully its only the 2 crank bearings that are bad. I would rather not pay for every bearing to need inserts.
How are they holding up thus far?
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#133 Reply
Posted by
GrkGuy
on 10 Dec, 2013 13:05
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on a stock to mild port motor they should be the last ones you buy, if your cases are in good shape just get them fixed.
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#134 Reply
Posted by
LT250RWV
on 10 Dec, 2013 13:27
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I havent had a problem out of it seen the inserts. I had Jerry Hall do the inserts at hpr. His number is in the service section at the bottom of forum board.
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Ok, now I have a very sweet oppertunity. Can I put a 90 lt 250 motor in my 85 frame? How much work would that entail?
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#136 Reply
Posted by
Chuckie25
on 10 Dec, 2013 14:01
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You've gotta cut out the down tub and fab an upside down Y into it for the pipe to go through. Only thing that I'm aware of that needs to be done.
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Doesent sound too terribly hard. I can get a good one with the v force reeds for 150. If I don't swap it in I guess I can part it out for more then that. If its as simple as I think it is ill be parting out the 86 motor.
Has anybody done this and can give me more info on the job?
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#138 Reply
Posted by
GrkGuy
on 10 Dec, 2013 14:17
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now your talking DR, do the switch..
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I'm thinking that that is going to be the way I go.
Maybe I should start a new thread on doing the swap since this one is getting kinda cluttered up
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#140 Reply
Posted by
GrkGuy
on 10 Dec, 2013 14:39
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i think 2 down tubes would work, just take out the center one and put 2 new ones on each side,
and i think thats the only thing you need to do, then you wont have to take top end off to inspect reeds.
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#141 Reply
Posted by
Chuckie25
on 10 Dec, 2013 14:51
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i think 2 down tubes would work, just take out the center one and put 2 new ones on each side,
and i think thats the only thing you need to do, then you wont have to take top end off to inspect reeds.
If I weren't triking my 88 frame that's what I was going to do since it's redone for an 85/86 motor
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And I would have more performance, as well as more options for parts. Everything I read so far has said to cut out the lower part of the post, put complete motor in with exhaust, place pieces that are bent to form the upside down Y around exhaust and aline them so that you can weld bolt locations for the motor mounts. I would probably also weld the mount for the head just to do things right.
Looking at a good chunk of change for the rebuild on this motor, but I think I would save in the long run beacuse it doesent need as much machine work as my 86 motor does. What do you guys think?
Chuck, you should buy my 86 motor
after I get this done, just in case everything goes
**** up.
Not to mention I would also need to get a different carb and CDI box, Right?
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#143 Reply
Posted by
GrkGuy
on 10 Dec, 2013 15:13
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well yes a bigger carb would be good, you can find a oem carb for cheap, not sure on the cdi, if chuck didnt
**** off kyle, he could tell you if you can use the cdi. lol
but i think if you take out the 1 down tube that goes into 2 tubes and just put 1 tube on each side then you would be ok, but yes put motor in first with pipe. oh and you will need a 87+
pipe, either way you gonna spend a little bit of cash, but most guys like the 87-92 motors
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All of the CDI boxes on ebay show they work from 85-92 So I might be good on that part. arent stock carbs for the 90 34mm?
well figure to get what you want you gotta spend the cash, well oh well if I dont spend it then my wife will on things like clothes that arent stained with oil.
and it will probably be something that I can work on wait for funds, order parts, wait for parts, work on, then wait for funds again.
Ok Ill be buying the 90 motor tomorrow. Ill post up pics when I get her home.
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How much for the motor?
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I meant how much for the 86' you will be selling?.......
LOL
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I donno yet I havent got that far yet.
Its not in great shape, the cylinder needs bored/hone, the cases need some attention to the bearing seats, the crank is shot. but other then that its in decent shape.
But before I get rid of that I want to get this 90 going together, dont want to screw myself over if it doesent end up working out.
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The only reason I'm not going to do the same with my 86' is only because it was MY 1st quad. If it wasn't for that, I'd make the conversion myself. How much of a difference is there between the 1st generation and the other gen's in terms of HP & FTLB's?
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I'm kinda curious about that myself. I think the biggest improvment is availability for parts and expandability with the newer vs the older motor. number wise I have no idea.
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