Author Topic: 87 Engine Rebuild Advice  (Read 1090 times)

Offline Knock10090

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87 Engine Rebuild Advice
« on: June 25, 2016, 07:45:30 pm »
Glad to see the forum is still kicking. Been a little while since I've been on here. Ran into a problem a few days ago. The numb nuts that had my LT250r before I did said he had the top end "freshened up". Well. Whatever he did was poor. My machinist can still see the bore bar marks which shows they over bored and couldn't hone.

Anyways. I decided to do a top end the correct way and the cylinder is out being taken to 68mm.

Big question now is:  Do I go all in, split the cases, hot rods crank kit with all new bearings and seals to make it a complete motor rebuild or just do the top end?

There isn't any particular reason or problem too touch the bottom end, it would be done just because.

What do you guys think?

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Offline Jgilbo17

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Re: 87 Engine Rebuild Advice
« Reply #1 on: August 21, 2016, 04:57:40 pm »
i understand wanting to go with the dont broke dont fix it deal, i did the top end of mine and 3 races into the season and then i ended up missing 2 races becAuse i had to tear it down for a stator side crank bearing. just tear it down and inspect everything especially the shift forks.
1986 lt250r chassis, 1987 lt250r motor, tudors 12 petal v-force v3 reeds, 42mm lectron carb with powerjet, +6in chromoly swingarm, jj+a axle carrier, durablue xcaliber axle, ceramic coated fmf gold pipe, srpd case saver, regina comp series chain, renthal sprockets, bunch of stuff i forgot

Offline GrkGuy

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Re: 87 Engine Rebuild Advice
« Reply #2 on: August 21, 2016, 07:36:15 pm »
Run it till u have a problem. I would just change the seals on crank, and shifter.
That's just me.
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!"


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