Vintage Dirt Bike Q & A

Hello,

I'm rebuilding my 1974 MT250 motor and have run into trouble when I don't have the right tool for the job. I've searched the threads and found various pullers listed with corrections and updates. I've also found various "in a pinch" methods. I want the right tool for the job and will take the time to find the right tools, but I need your help.

I would like to have a list of the proper pullers, separators and case screws, bolts etc. If I can keep it on one post and compiled it would be great so people can use it as a reference for future projects.

So far it sounds like Motion Pro has Flywheel Puller M18x1.5 R.H. External Thread for $9.90

Part number 08-0116

Can someone add to this and/or confirm this?


Case separators Etc?

Thanks

Ya you need the flywheel puller and you will also need a crank splitter I used a motion pro and loved it got it for 130 look around. You also need a bearing puller as one of the bearings cannot be pressed out it has to be pulled. I also used an air gun to take off and put back a few nuts like clutch center nut magneto nut and so on. I think thoses were the only special tools I used.

I use the following:
Tusk Case Splitter
Tusk Crank Puller
Tusk Clutch basket holder
Honda flywheel pullers or two claw flywheel puller if you can't find the right one.
Freezer and heat gun to fit bearings into their journals and to fit the crank into the bearings.
Craftsman torque wrench
I try to avoid the impact wrench and never use one to tighten bolts or nuts. I've broke too many things already!
Caliper and bore gauge
pison ring wrench (sear's and harbor freight carry them)
snap ring pliers
Can't think of any other tools that would be considered specialty.

Search for Tusk Tools on the web. They are cheaper than Motion Pro and still very good quality.

good luck,
nola_fiddy

O ya I did forget the snap ring pliers nola is right you will need a pair of those as well. Yes I have broken a few things with the air gun but I was being stupid lol I actually broke the same bolt twice with it ya smart guy. If you do use one just dont use it on anything small like the 6mm bolts that hold the clutch springs they break real easy. I have never needed anything to pull the crank it pulls right out of mine with a little effort and then I can press it in by hand. My bearings are new and I use a lot of grease but yours may be difficult the honda shop manual tells you to use a mallet to get it out of the case I would just use a press not sure what honda was thinking. I also found out the hard way you should have your crank checked for true if you have any bad crank seals before your rebuild because if it was the crank that ruined the seal because it was untrue it will do it again untill you have it trued. I just had mine rebuilt my crank and it no longer eats crank seals.

Thanks, I'm still hoping to get part numbers and bearing numbers. I still can't find a local bearing supplier with bearing number 83483 which measures 17IDx42ODx12wide. The numbers on most the bearings are easily referanced but, some are not.

It would be great to have a list of all bearings and seals that go on that bike with numbers and a dealer who will recoginze the numbers and get them fast.

I've been slowly collecting the bearings and seals I need. I know ebay has "bearing sets" but I am not sure they are quality bearings.

Why all these parts manuels do not list which bearings or at least the dimensions of the bearings does not make sense.

Well, again my local motorcycle shop ordered the wrong bearings for my bike. They ordered MSRHP part number 41-3852 I told them it listed these as being CR bearings not MT and they assurred me they were the right ones. They are not. I'm still wondering why this is not easier. CMSNL or whatever they are called seems to have the right parts, but charge a high price. I don't understand why this is not easier. I can tell dealers the exact numbers off the bearings and they might get a few. I take take measurements and check with random bearing companies, but in the end I guess I'll order from Europe.

Does anyone have a part number and a company that has what I need for all the bearings and Oil seals inside a 1974 MT250 case?

It's like I'm speaking Greek to some of these people when I tell them the numbers and even the big bearing supplier does not have little 83483.

I got my seal kit from http://www.amsracing.com its for a cr250m but they are the same trust me I am using them right now and they work great. I have a shop manual that lists all bearings as its a honda manual I will list them when I get a chance. You should reference part numbers for the cr250m and the mt250 for the bearings as me thinks they are the same. If they are the same ams racing should be able to get them all for you.

The kit they gave me for my 1974 MT250 is MSRHP msracing Bearing Kit 41-3852 24-1004, NZR30-1Q. I checked and it shows to be for 84-91 Honda CR250 that explains why the bearings are so far off. They measure ID 27.87mm x OD 67.98mm x Width 18 mm.

As you know I need 6306 C3 with measures ID 29.39 mm x OD 72 mm x width 19mm.

You must be right that they are the same if you get the years right. They did not even manage that. They say they will have the correct bearings in the morning.

I corrected the wiring issues on my 1976 MT250 and ran it for the first time last night!! Very cool!

Woosh, its funny you mention the clutch springs. That is exactly the last thing I broke with my impact wrench! I broke it once, got a new one and broke it again! I was pissed and swore off the darn thing.

I also thought of a couple other tips. Use feeler gauges (two of them) to slide into your crank, opposite the dowl pin to keep the crank halves from bending inward during installation. Also, I cut off a shaft from the crank and use it to drop into bearing. I heat the shaft with a torch and it heats the bearings without applying direct heat.

good luck and have fun!
nola_fiddy

I am glad im not the only one that did that twice you would think we would learn after the first time lol.