OzVMX Forum
Marque Remarks => Yamaha => Topic started by: SteveYA6 on August 11, 2016, 05:26:25 am
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Hi, I am new to the forum. I have a YZ 250B that I am looking at restoring. I hope that I can help and get help from you guys.
Here is the bike as we loaded it on Saturday evening.
(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1406_zps8m1uao1v.jpg)
(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1409_zpsil4m18ed.jpg)
I have done a bit, but will post more pictures as I progress along.
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Oh Mate, i was lucky to have ridden one of those for a season [after it had already done a season]. Best bike i ever rode--well it was at that stage & probably remained my favorite right up to my 465G in in 1980, maybe that's stretching it a bit but anyway. Lucky you & great to see another one found to be bought back to its former glory. Cheers.
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ooooh - bit of work there. I have a 360B that I agree with OTH - best bike I have ridden.
I have an MX B airbox (body only) that will fit and maybe some other spares also when you work out what you need. Lots of contacts for spare parts as well.
All the best
Rossco
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Thanks guys, I managed the teardown quite successfully, only three issues, one sheared bolt, the front engine mount bolt frozen and the swingarm bolt frozen. I have taken the frame in to see if we can get the swingarm bolt pressed out gently, before I start cutting anything, although I think cutting may be inevitable.
Here are a few more pics of the bike stripped.
bucket of bits, I am quite happy that the old fibreglass is still good, if a bit dry.
(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1437_zpshdboa27i.jpg)
front forks - definitely a spot of new chrome needed here.
(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1435_zps1zjza8jz.jpg)
Bare frame with it's swingarm bolt.
(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1430_zpsmrszsifm.jpg)
And of course the rear shock - my suspension guy is going to get excited when he sees this - he got really excited when he saw the 79 IT175 back shock.
(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1433_zps4etmjdef.jpg)
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swingarm with the vertical stay shows an early model B. I have a complete spare shock if needed. The fibreglass parts you show are available aftermarket - would just have to clear some Alzheimer's and remember where :)
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Just been to the engineering shop and the swingarm is now not part of the frame. All removed and no damage done. He also kindly removed the sheared bolt. Looks like this bike wants to be restored, it is fighting much.
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good to hear - have heard some horror stories about getting swingarm bolts out.
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it will be a pretty sweet bike when your finished....polishing and cleaning with Mr Sheen ;D
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(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1441_zpsrxjtwg2y.jpg)
Isn't it awesome restoring Yamaha's. Our local agent had all the swing arm parts in stock.
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where did you find that beauty.
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The 360 my boss had for a while & was probably second hand [although we may have sold it new] leaked behind the air filters because the base was only pop riveted to the fibreglass airbox & the dust got through behind, Sealed it off properly & was ok but damage had been done previously. Also i suppose seal off the flange where the inlet hose goes to the carb. This is all from memory [how many years ago lol]. 250 i had a loan of for a season was just awsome even though it had done a season previously. Think i mentioned all that bit going back some.
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We found it in an old guys garage. I went with a mate to look at two IT 490's, there were no IT's just this. The guy was just grateful for the garage space.
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Just fetched some of the electroplating. Not too bad for parts that are 41 years old.
(http://i1135.photobucket.com/albums/m628/Steve4L0/IMG_1447_zpsw1um8wg8.jpg)
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Well, That was a great fined.
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Steve - is it going to be a rider/racer? If so get rid of the standard kick start knuckle now before you break something - if I remember rightly the earlier DT1 is MUCH better (but can dig up the info to confirm if you like)
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I want to keep it in my collection, but all my bikes get ridden. I don't know that it will be a full time racer though, just go and show it at the local VMX meetings.
I have a RT3 and that kick start looks to be the same as the one for the YZ.
I have a '79 IT 175 that is almost done, just having a hassle with the front wheel and waiting on a headlight on EBAY. Will get it out and take a few pics just now.
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Use the kick starter from the DT2MX it swings out unlike the dt or rt ones , stronger than the YZ one too .
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Is this the kick start that you are suggesting I use?
(http://i1135.photobucket.com/albums/m628/Steve4L0/YZ250/KICK_STARTER_zpsf6xpeiet.gif)
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Here is my IT 175, as far as it is.
(http://i1135.photobucket.com/albums/m628/Steve4L0/IT%20175/IMG_1451_zpsfpfjcf6m.jpg)
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Question time: I know that the old DID rims were problematic, particularly the front rims, prone to cracking. If I put new Excel rims on the bike, would I be doing the bike an injustice?
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If it's going to be a show queen and not ridden I would use did rims .
If it's a racer and show bike I would go with excel rims for safety and peice of mind just my opinion.
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Steve - both my wheels were cracked - replaced them with silver SM Pros - cheaper than Excels and look Ok also
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when your local guy sold you the swingarm covers and washers did he also have the 2 bearings sets and the steel bush pivots that make up each sides set ? if so can you PM me price and info.
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I believe that I have all the bits and bobs for the swing arm. The thrust bearings, never seen those before, the needle rollers and the new seals for the covers.
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Lovely job so far Steve , The YZ a and b are in my eyes the best of the YZ's . I'm in the process of a B 250 as well started with just a bare frame and empty engine cases . http://s63.photobucket.com/user/iain_cameron1/media/085_zps8eee8350.jpg.html
I have got a fair bit more done now . Found a airbox and covers on US Evilbay . Tony had a cylinder at Broardford bonanza , even had a head in my stash that I had forgotten about . http://s63.photobucket.com/user/iain_cameron1/media/IMG_20141103_184858_zpskopqfkhk.jpg.html
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I got the paint back this morning. Will sort and take pictures over the weekend. I think the next step is redo the swing arm bearings and I can start assembling the frame. Oh, and I get the shocks back tomorrow, I am hoping that they look mint. Will be posting a few pics this weekend.
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I am not going to post pictures, the paint is all wrong and it has to go back. The guy didn't do anything I asked and did everything wrong. Just don't get good help these days. :o( I hate fighting with people, especially around doing things right.