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Old 11-30-2016, 08:55 AM
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Default 2005 RM85 Flywheel/Rebuild

     

I'm helping a friend rebuild an RM85 to pass down to his little brother. The flywheel is stuck on the crank pretty good. Hit it with a puller and the crank started to mushroom (not too big a deal since we're replacing it). He decided to purchase the Suzuki puller (previously we used a jaw-type puller) and give it another go but, before we do, any tips to get it to loosen up??
Also, my CR250 cases can be split without removing the trans/shift drum/ pawls/etc. Anyone know if the RM85 (2005) can be split this way as well??? or do the trans and related components have to come out?
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Old 12-01-2016, 03:56 PM
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I have had an '06 rm85 apart and the trans does not have to come out. If I remember correctly there is a left handed nut holding the primary gear on. The water pump takes some abuse as it is a direct drive from the crank. If the engine hits 10,000 rpm, so does the water pump. I would replace bearings and seals for the water pump while you are in there.
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Old 12-01-2016, 08:39 PM
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Question....Why would you want to split the cases and not do a full rebuild of bearings and seals while you are in there?

Paw Paw
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Old 12-01-2016, 08:51 PM
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Quote:
Originally Posted by 351mustanger View Post
I have had an '06 rm85 apart and the trans does not have to come out. If I remember correctly there is a left handed nut holding the primary gear on. The water pump takes some abuse as it is a direct drive from the crank. If the engine hits 10,000 rpm, so does the water pump. I would replace bearings and seals for the water pump while you are in there.
Thanks! I'll leave it aloneand hope it stays put during the rest of the rebuild.

---------- Post added at 09:51 PM ---------- Previous post was at 09:50 PM ----------

Quote:
Originally Posted by PawPaw View Post
Question....Why would you want to split the cases and not do a full rebuild of bearings and seals while you are in there?

Paw Paw
The motor is being rebuilt. A full kit has been ordered and all components will be checked and replaced as necessary. Not sure at which point it was insinuated that seals and bearings would be reused.
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Old 12-01-2016, 08:56 PM
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If you are not replacing the trans bearings, you are not doing a complete rebuild. The parts and cases need to be cleaned and new parts installed and that requires the removal of the trans and shifter. Also the cases should be heated and the bearing chilled for proper install and that too requires the removal of the trans related parts.

Paw Paw
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Old 12-02-2016, 07:57 AM
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Quote:
Originally Posted by PawPaw View Post
If you are not replacing the trans bearings, you are not doing a complete rebuild. The parts and cases need to be cleaned and new parts installed and that requires the removal of the trans and shifter. Also the cases should be heated and the bearing chilled for proper install and that too requires the removal of the trans related parts.

Paw Paw
If they come in the box they'll be replaced. If they don't they'll be checked and replaced if necessary. I don't think this bike has more than 20 hrs. We're rebuilding it because it sat for a LONG time and developed rust on the crank webs and I'm afraid it'll come loose and cause more damage. There's also a small nick in the Nikasil toward the bottom of the cylinder. Everything immersed in oil seems to be in good shape so far (I've only looked in the side cover while removing clutch assembly/gears/etc. I will talk to him about the trans bearings and see if he wants to do them regardless of condition and whether they're in the rebuild kit or not.
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Old 12-02-2016, 08:46 AM
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OK, so let me guess that the owner purchased a kit like from Hot Rods. It will not have the water pump parts needed nor any of the trans bearings or seals that will also be needed on a bike that set for some time. That leaves about 6 bearings and 7 seals that will not be replaced.

Paw Paw
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Old 12-02-2016, 02:05 PM
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Quote:
Originally Posted by PawPaw View Post
OK, so let me guess that the owner purchased a kit like from Hot Rods. It will not have the water pump parts needed nor any of the trans bearings or seals that will also be needed on a bike that set for some time. That leaves about 6 bearings and 7 seals that will not be replaced.

Paw Paw
I believe he purchased a Wrench Rabbit kit, but it's his bike and I'm just helping him take it apart and put it back together, not telling him the level of rebuild he should do.
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Old 01-08-2017, 04:12 PM
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Update for anyone reading this thread in the future: the kid I'm helping rebuild this 85 FINALLY brought the rebuild kit (Wrench Rabbit) over. The kit contains transmission bearings.
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Old 01-09-2017, 03:36 PM
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Even with the correct puller, this flywheel DOES NOT want to come off!! Any tips??
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Old 01-09-2017, 04:07 PM
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Sometimes they are on there tight. You could try some heat and some smacks with a plastic mallet. Doing this while the puller is keeping tension.
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Old 01-09-2017, 06:42 PM
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i would do as 351 suggests....but i would also spray alil kroil or PB on shaft end @ key slot....maybe heat and cool a couple times to draw oil in too.

Last edited by 6670argclh6670; 01-09-2017 at 06:50 PM.
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Old 01-10-2017, 09:52 AM
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Thanks guys. It's been hit with PB Blaster a few times between the initial try and now with no luck. I have also used a propane torch on it a few times. It's weird because the oil seems to be going through. It puddles and within a few minutes it is not there anymore. I'll try hitting the bolt and report if it comes out.
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