What size flywheel puller do I need for a 1980 YZ250?

karterron
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karterron
Edited Date/Time 1/25/2012 9:10pm

Anyone have a book, or experience? I can't find a listing anywhere for a 1980 YZ250 flywheel puller. I did take off the side cover, and it's definately not the 27mm that a lot of the YZ's use.

Anyone know what size flywheel puller I need. It's internal threads.


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mooch
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mooch 10/10/2010 4:21pm
10/10/2010 4:21pm
Whew, if you find anyplace selling one please let me know as I gave up.

I came across a number of pullers at dealers and on ebay that claimed to be for an 81 YZ250 but none of them were the right size.
karterron
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karterron 10/10/2010 5:00pm
10/10/2010 5:00pm
I'll have to figure it out, I think I have a shift fork issue and need to split the cases. I'm running into the same issue, everything I see is showing a regular YZ puller. I had one of those and it's definately not the right one.


captmoto
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captmoto 10/10/2010 7:06pm
10/10/2010 7:06pm
What I used on my 465 was a puller that worked on a bunch of enduro models. It was on the shelf at my local Yamaha dealer. It fit nearly everything made in the 70s-early 80's. Does yours have the external flywheel?
karterron
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karterron 10/10/2010 7:26pm
10/10/2010 7:26pm
captmoto wrote:
What I used on my 465 was a puller that worked on a bunch of enduro models. It was on the shelf at my local Yamaha...
What I used on my 465 was a puller that worked on a bunch of enduro models. It was on the shelf at my local Yamaha dealer. It fit nearly everything made in the 70s-early 80's. Does yours have the external flywheel?
No,external. The IT models are external, but not the YZ. Or not the 80 YZ anyway.




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xnationalwrench 10/10/2010 7:54pm
10/10/2010 7:54pm
If the puller you need is for the small inner rotor type, I think you need the 20mm X 1.5 puller. Dennis Stubbfield part number MP-7 there is a picture of this at Dennis Kirk (their part number 28-1955)
newmann
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newmann 10/11/2010 5:39am
10/11/2010 5:39am
If all else fails, I have one I could let you borrow. Just have to promise to ship it back.
captmoto
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captmoto 10/11/2010 4:39pm
10/11/2010 4:39pm
newmann wrote:
If all else fails, I have one I could let you borrow. Just have to promise to ship it back.
Can you give the dimensions so we can know waht to look for to buy one?
Thanks
karterron
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karterron 10/11/2010 5:13pm
10/11/2010 5:13pm
I ordered the one from Dennis Kirk today that xnationalwrench posted above. I should see it tomorrow or Wednesday from them and will post up if it's the right one. The pic looks like it is.

Dennis Kirk shows a different part number for a 1980, but when I look at the one they say it should be, I know it's wrong because I already have that one from my 2005 YZ250 and it does not work on a 1980.
project racer 10/11/2010 5:40pm
10/11/2010 5:40pm
If I recall, the original Yamaha rotor puller that came in the tool kit with the bike was one of those little short bolts with the hollowed out center.
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newmann 10/11/2010 5:42pm
10/11/2010 5:42pm
newmann wrote:
If all else fails, I have one I could let you borrow. Just have to promise to ship it back.
captmoto wrote:
Can you give the dimensions so we can know waht to look for to buy one?
Thanks
Mine was made by a local machine shop. I took in an old 74 YZ125 bottom because I couldn't find a puller and couldn't get the flywheel off with my trusty 3 jaw puller. The machinist took a large bolt, cut it off about at 2 inches of unthreaded shaft and threaded it to fit the flywheel. Drilled a hole through the middle and threaded it for a smaller diameter bolt. Instant flywheel puller.
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mooch 10/12/2010 8:51am
10/12/2010 8:51am
Newmann was a lifesaver for me when I did the bottom end of mine over the winter a few years ago. While having the puller out on loan from him, I looked around for a large metric bolt to make my own but I gave up on that too. Other than finding a good guy to borrow a puller from, I'm batting zero for coming up with my own.

It'll be good to hear if the puller Karterron ordered is the right one!
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motogrady 10/12/2010 11:23am
10/12/2010 11:23am


WWW.MBSMFG.COM

Heartland Products

773-276-6900

Mike Hatkevich, sales

I just got a 27mmx1.25 for 12 dollars.

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newmann 10/12/2010 12:07pm
10/12/2010 12:07pm
The one I have is approx. 17-18mm and a 1.5 pitch thread. Never used it on my bike, but Mooch said it worked fine on his 81 model.
karterron
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karterron 10/12/2010 12:33pm
10/12/2010 12:33pm
motogrady wrote:


WWW.MBSMFG.COM

Heartland Products

773-276-6900

Mike Hatkevich, sales

I just got a 27mmx1.25 for 12 dollars.



It is definately NOT that one. I have tried a 27mm and it's not even close.

The one I ordered is this one, it will be here tomorrow and I will post if it's correct or not. It's crazy how nobody shows one for this model. They seem to be all over the place as to which is right or wrong. I got it from Denniskirk based on xnationalwrench's post.





[20mm x 1.5mm]
[20mm x 1.5mm]
Item# PM2015A-1A1G
Regular price: $17.99
Sale price: $9.99
Availability: Usually ships the same business day.
Product Description
20mm x 1.5mm Right Hand Threads.

The following list is for reference only. Please check the thread size of your motor before ordering.

For Honda Models: MT250 & Early MX 2 Stroke Engine Models

For Yamaha Models: 70's YZ125, YZ250, YZ 360, 2 Stroke Street Twin Cylinder RD250 & RD350 Models

This tool is brand new. A must have tool for anyone working on charging or ignition systems.

This puller is not made in China or Hong Kong . It is professionally made in the USA on the state of the art CNC equipment with 100% quality inspection.

Puller comes with black oxide finish preventing corrosion to assure many years of service.
karterron
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karterron 10/13/2010 12:17pm
10/13/2010 12:17pm
Well, it's not the 20mm either. It's closer than the 27, so going in the right direction. Going to order the one that Newmann posted and cross my fingers. Good thing these don't cost much.


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mooch
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mooch 10/13/2010 1:00pm
10/13/2010 1:00pm
karterron wrote:
Well, it's not the 20mm either. It's closer than the 27, so going in the right direction. Going to order the one that Newmann posted and...
Well, it's not the 20mm either. It's closer than the 27, so going in the right direction. Going to order the one that Newmann posted and cross my fingers. Good thing these don't cost much.


Thanks a bunch for the update on that one! I was thinking 20mm would be a bit too big as I had measured Newmann's and thought it looked to be 18mm.

Appreciate you being the flywheel puller guinea pig here...if you don't mind, could you post back when you get the 18mm puller in your hands?

Thanks again!
newmann
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newmann 10/13/2010 1:48pm
10/13/2010 1:48pm
Measuring the outside diameter of the threads on mine it's 18mm.
karterron
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karterron 10/13/2010 6:08pm
10/13/2010 6:08pm
karterron wrote:
Well, it's not the 20mm either. It's closer than the 27, so going in the right direction. Going to order the one that Newmann posted and...
Well, it's not the 20mm either. It's closer than the 27, so going in the right direction. Going to order the one that Newmann posted and cross my fingers. Good thing these don't cost much.


mooch wrote:
Thanks a bunch for the update on that one! I was thinking 20mm would be a bit too big as I had measured Newmann's and thought...
Thanks a bunch for the update on that one! I was thinking 20mm would be a bit too big as I had measured Newmann's and thought it looked to be 18mm.

Appreciate you being the flywheel puller guinea pig here...if you don't mind, could you post back when you get the 18mm puller in your hands?

Thanks again!
I will let you know, it shouldn't be this hard to figure out. The 20mm fits right on the outside, so it's looking like the 18mm should be right. I ordered it today, so hopefully it's here by Friday and I will let you know if it's the right one.

Luckily, these don't cost much money.
karterron
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karterron 10/15/2010 1:22pm
10/15/2010 1:22pm Edited Date/Time 10/15/2010 1:22pm




Woohoo, got the puller in from mbsmfr that Newmann posted earlier and it works. It was the 18mm X1.5 and it cost around $15 after shipping.



Cases are now split, now on to find out what's wrong with the transmission. Anyone know what year and models the shift drum part number cross references to for a 1980 model? I looked on the Yamaha parts listing and the part number shows 25Y-18540-00-00, when I check Bikebandit, it shows that it's for a 250g or a 250h. I thought the 81 YZ went to a 5 speed? How could the drum be the same?



This thing was hard to get into first, and would slip in and out of 3rd. I'm replacing the shift forks and drum for sure. Then checking to see what gears might be damaged.
project racer 10/15/2010 2:05pm
10/15/2010 2:05pm Edited Date/Time 10/15/2010 2:07pm
I owned a new 1980 YZ250 G back in the day. Transmission started acting like the chain was skipping around the sprockets. Every gear from second up to sixth, the trans just shuddered and skipped. The bike was only four months old when this happened.

I had the motor apart three times before the problem was diagnosed. Replaced shift forks, drum , second ,third, and fourth gear sets. Buttoned it up the final time after all this, and still had the same problem I started with.

Finally, took every gear off the counter shaft and main shafts. Chucked them in a lathe with a dial indicator. The counter shaft itself had quite a bit of runout. Bought a new counter shaft , reassembled . problem solved.

I can only think that the chain tension was adjusted to tight at some point. With the chain growing more taunt with the compressing of the rear suspension over some fairly good sized jumps, is the only explanation I could come up with for this happening.

Crap, just went through my old stuff, and I still have my manual and sales brochure for my 250G.
karterron
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karterron 10/15/2010 2:42pm
10/15/2010 2:42pm
Thanks project, the countershaft does look good but better safe than sorry. I'll go ahead and replace it while I'm in there now that I hear what you're saying. I don't think that's the problem because it doesn't do it in every gear. But, I would rather play it safe than to tear it apart again.

I plan on taking all winter to go through this motor. Rod, trans, piston, and new bearings.


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AHRMA361 10/16/2010 11:01pm
10/16/2010 11:01pm
The K&N part number for the tool is 82-0200.....I bought mine a few years ago...from either Tucker rocky or Parts Unlimited....looks just like the photo above.....cheap too! My last Rotax puller was $75!
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mooch 11/27/2010 4:07pm
11/27/2010 4:07pm
karterron wrote:
Woohoo, got the puller in from mbsmfr that Newmann posted earlier and it works. It was the 18mm X1.5 and it cost around $15 after shipping...




Woohoo, got the puller in from mbsmfr that Newmann posted earlier and it works. It was the 18mm X1.5 and it cost around $15 after shipping.



Cases are now split, now on to find out what's wrong with the transmission. Anyone know what year and models the shift drum part number cross references to for a 1980 model? I looked on the Yamaha parts listing and the part number shows 25Y-18540-00-00, when I check Bikebandit, it shows that it's for a 250g or a 250h. I thought the 81 YZ went to a 5 speed? How could the drum be the same?



This thing was hard to get into first, and would slip in and out of 3rd. I'm replacing the shift forks and drum for sure. Then checking to see what gears might be damaged.
Hey, just now remembered to get back to this thread to see if you had any luck with finding the right flywheel puller for your 1980 YZ250. !

Thanks for posting back that it worked and thanks to Newmann for posting the link to it. I had been paranoid about needing to borrow Newmann's puller again if I ever needed to split my 81's cases again.

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