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07-01-2018, 10:54 PM | #1 |
Gone Wild
Join Date: Mar 2018
Location: The Desert
Posts: 248
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G1 crank bearings shot
Took engine out today to replace crank seals and found way to much play in the crank bearings. Probably why the seals are shot. Im hoping the big end bearing is ok and can just replace the crank bearings. Searched all over and cannot find a video of case splitting a G1. I have a case splitter and crank puller for my dirt bikes, just did my yz 125 crank. Will they work to split my cart cases? Is it roughly the same procedure as a 2stroke dirt bike bottom end? If so which side should I pull the crank into first?
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07-01-2018, 11:29 PM | #2 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: G1 crank bearings shot
I'm not familiar with a splitting a yahama dirt bike but the g1 can be split with a steering wheel puller if you have long enough bolts.. there's a spot on the case to thred bolts in then push on the crank to split the case
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07-03-2018, 07:28 PM | #3 |
Gone Wild
Join Date: May 2015
Location: Central Florida
Posts: 2,114
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Re: G1 crank bearings shot
Its simple.
Remove everything off the motor and stick it in the oven, yeah, that's right, stick it in the oven 350 degrees, for about 20 minutes, you will be able to tap the case off, no pullers needed. Ive never done it any other way |
07-04-2018, 09:46 AM | #4 |
Gone Wild
Join Date: Jan 2017
Location: venice
Posts: 1,807
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Re: G1 crank bearings shot
watch the cheap china stuff. get a good quality bearing
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07-04-2018, 02:01 PM | #5 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: G1 crank bearings shot
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07-04-2018, 05:17 PM | #6 |
Gone Wild
Join Date: Mar 2018
Location: The Desert
Posts: 248
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Re: G1 crank bearings shot
Great advice, thanks. I found factory yamaha crank bearings and will order them. Disassembled engine today and found crank to be in good shape as well as piston. Does anyone have rod to crank side play spec? Side play seemed fine but want to check and no vertical play in big end bearing at all. Piston is std and looks great as well as cylinder bore. The quench area in head is almost comical and could be measured in ounces instead of cc's, pump gas friendly for sure. Thinking about using piston again with new rings and wrist pin and bearing. I used my case splitter to split cases and push crank out, worked well.
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07-04-2018, 05:25 PM | #7 |
Gone Wild
Join Date: Mar 2018
Location: The Desert
Posts: 248
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Re: G1 crank bearings shot
Have to order some parts now and clean and inspect everything again but have to do some race prep to the bike and quad for the night races this weekend. My 4yo daughters first race. Ive included a pic with the part numbers for my case splitter and crank puller, both are Tusk brand and were had for under $200.00 in case anyone was wondering. Also a pic of one of my rings. Its hard to see but there is i almost split in the middle of the ring, any thoughts on this? It will catch your nail but i didnt see annything on the cyl bore. Have a safe and happy Fourth of July!!!!
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07-04-2018, 06:35 PM | #8 |
Gone Wild
Join Date: May 2015
Location: Central Florida
Posts: 2,114
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Re: G1 crank bearings shot
Since you race, a trick we did many years ago on that motor was the Yamaha motorcycle head gasket which is much thinner and 2 base gaskets.
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07-04-2018, 09:01 PM | #9 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: G1 crank bearings shot
You seem to know your way around motors and if you have a good machine shop I'd highly suggest getting an over sized Piston and have them bore it out (do a quick google search you can still get them I didn't want to post a link beings it's not a sponsor) but for the extra money you're already this deep into the motor in my opinion it's worth the new parts simply because that's an original Piston no younger than 29 years old... Best part is when they bore out the machine shop will get a great cross hatch on the cylinder wall after they are done
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07-05-2018, 09:22 PM | #10 |
Gone Wild
Join Date: Mar 2018
Location: The Desert
Posts: 248
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Re: G1 crank bearings shot
I have done this on my yz 125 with Athena jug and head to lower compression. Its an o-ring head gasket so no changing there, three base gaskets and I could run pump gas. Ended sucking air from them, went lean, and killed the rod big end. Went back to one base gasket and race gas to keep from detonating.$8.00 per gallonbut is screams for a little pinger.Do you remember which yamaha,IT,YZ ect you used? I may try it.
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