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Old 03-02-2012, 06:47 PM   #31
Copperhead64
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Joined: Mar 2012
Location: West Tennessee
Oddometer: 9
Bought this one off a friend for $200,rolled it off the trailer,dumped some premix in the tank and away I went!
Old bike would make your hair bleed.
Good luck with yours,
It'll be awesome when you finish.
My 15 year old rode it everyday for a month till it roasted a piston skirt and I traded it.Had the stock piston from 74 best that I can tell.
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Old 03-04-2012, 04:23 AM   #32
Cat Daddy
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Location: Working in my shop in Springtown Texas
Oddometer: 837
Fork seals for your bike are Yamaha number 278-23145-51-00 and still quite available. Powersports Plus has them.

http://www.powersportsplus.com/parts...145-51-00.html

That same seal fits the following bikes...

1967 YR1 FRONT FORK
1968 DT1 FRONT FORK
1968 YR2 FRONT FORK
1968 YR2C FRONT FORK
1969 DT1B FRONT FORK
1969 DT1S FRONT FORK
1969 R3 FRONT FORK AND FRONT FENDER
1970 DT1C FRONT FORK
1970 DT1CMX FRONT FORK
1970 R5 FRONT FORK
1970 RT1 FRONT FORK (RT1, RT1M)
1970 RT1 FRONT FORK (RT1B,RT1MX)
1970 RT1M FRONT FORK (RT1, RT1M)
1970 RT1M FRONT FORK (RT1B,RT1MX)
1970 XS1 FRONT FORK (XS1)
1970 XS1 FRONT FORK (XS1B)
1971 DT1E FRONT FORK
1971 DT1MX FRONT FORK
1971 R5B FRONT FORK
1971 RT1B FRONT FORK (RT1B,RT1MX)
1971 RT1MX FRONT FORK (RT1B,RT1MX)
1971 XS1B FRONT FORK (XS1B)
1972 DS7 FRONT FORK
1972 DT2 FRONT FORK
1972 DT2MX FRONT FORK
1972 R5C FRONT FORK
1972 RT2 FRONT FORK
1972 RT2MX FRONT FORK
1972 TD3 FRONT FORK
1972 TR3 FRONT FORK
1972 XS2 FRONT FORK (XS2) (TX650 - )
1973 DT3 FRONT FORK
1973 MX250 FRONT FORK
1973 MX250A FRONT FORK
1973 MX360 FRONT FORK
1973 RD250 FRONT FORK
1973 RD250 FRONT FORK RD250B
1973 RD350 FRONT FORK
1973 RT2MX FRONT FORK
1973 RT3 FRONT FORK
1973 SC500 FRONT FORK

1973 TX500 FRONT - FORK
1973 TX650 FRONT FORK (XS2) (TX650 - )
1973 TZ250 FRONT FORK
1974 MX250A FRONT FORK
1974 MX360 FRONT FORK
1974 MX360A FRONT FORK
1974 RD250A FRONT FORK
1974 RD350A FRONT FORK
1974 SC500A FRONT FORK
1974 TX500A FRONT - FORK
1974 TX650A FRONT FORK TX650A - XS650B
1974 TY250A FRONT FORK
1974 TZ350 FRONT FORK
1974 YZ250A FRONT FORK
1974 YZ360A FRONT FORK
1975 DT250B FRONT FORK 250B - C - 400B - C
1975 DT400B FRONT FORK 250B - C - 400B - C
1975 MX250B FRONT FORK
1975 MX400B FRONT FORK
1975 RD250B FRONT FORK
1975 RD250B FRONT FORK RD250B
1975 RD350B FRONT FORK
1975 XS500B FRONT - FORK
1975 XS650B FRONT FORK TX650A - XS650B
1975 YZ250B FRONT FORK
1975 YZ360B FRONT FORK
1976 DT250C FRONT FORK 250B - C - 400B - C
1976 DT400C FRONT FORK 250B - C - 400B - C
1976 MX125C FRONT FORK
1976 RD400C FRONT FORK
1976 TY250C FRONT FORK
1976 XS650C FRONT FORK XS650C
1976 YZ100C FRONT FORK YZ100C
1976 YZ125C FRONT FORK YZ125C
1977 RD400D FRONT FORK
1977 TY250D FRONT FORK
1977 YZ100D FRONT FORK YZ100D
1978 RD400E FRONT FORK
1990 MOTOCROSS - YZ250A FRONT FORK
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Old 03-04-2012, 11:09 AM   #33
Shocktower
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Quote:
Originally Posted by Cat Daddy View Post
Fork seals for your bike are Yamaha number 278-23145-51-00 and still quite available. Powersports Plus has them.

http://www.powersportsplus.com/parts...145-51-00.html

That same seal fits the following bikes...

1967 YR1 FRONT FORK
1968 DT1 FRONT FORK
1968 YR2 FRONT FORK
1968 YR2C FRONT FORK
1969 DT1B FRONT FORK
1969 DT1S FRONT FORK
1969 R3 FRONT FORK AND FRONT FENDER
1970 DT1C FRONT FORK
1970 DT1CMX FRONT FORK
1970 R5 FRONT FORK
1970 RT1 FRONT FORK (RT1, RT1M)
1970 RT1 FRONT FORK (RT1B,RT1MX)
1970 RT1M FRONT FORK (RT1, RT1M)
1970 RT1M FRONT FORK (RT1B,RT1MX)
1970 XS1 FRONT FORK (XS1)
1970 XS1 FRONT FORK (XS1B)
1971 DT1E FRONT FORK
1971 DT1MX FRONT FORK
1971 R5B FRONT FORK
1971 RT1B FRONT FORK (RT1B,RT1MX)
1971 RT1MX FRONT FORK (RT1B,RT1MX)
1971 XS1B FRONT FORK (XS1B)
1972 DS7 FRONT FORK
1972 DT2 FRONT FORK
1972 DT2MX FRONT FORK
1972 R5C FRONT FORK
1972 RT2 FRONT FORK
1972 RT2MX FRONT FORK
1972 TD3 FRONT FORK
1972 TR3 FRONT FORK
1972 XS2 FRONT FORK (XS2) (TX650 - )
1973 DT3 FRONT FORK
1973 MX250 FRONT FORK
1973 MX250A FRONT FORK
1973 MX360 FRONT FORK
1973 RD250 FRONT FORK
1973 RD250 FRONT FORK RD250B
1973 RD350 FRONT FORK
1973 RT2MX FRONT FORK
1973 RT3 FRONT FORK
1973 SC500 FRONT FORK

1973 TX500 FRONT - FORK
1973 TX650 FRONT FORK (XS2) (TX650 - )
1973 TZ250 FRONT FORK
1974 MX250A FRONT FORK
1974 MX360 FRONT FORK
1974 MX360A FRONT FORK
1974 RD250A FRONT FORK
1974 RD350A FRONT FORK
1974 SC500A FRONT FORK
1974 TX500A FRONT - FORK
1974 TX650A FRONT FORK TX650A - XS650B
1974 TY250A FRONT FORK
1974 TZ350 FRONT FORK
1974 YZ250A FRONT FORK
1974 YZ360A FRONT FORK
1975 DT250B FRONT FORK 250B - C - 400B - C
1975 DT400B FRONT FORK 250B - C - 400B - C
1975 MX250B FRONT FORK
1975 MX400B FRONT FORK
1975 RD250B FRONT FORK
1975 RD250B FRONT FORK RD250B
1975 RD350B FRONT FORK
1975 XS500B FRONT - FORK
1975 XS650B FRONT FORK TX650A - XS650B
1975 YZ250B FRONT FORK
1975 YZ360B FRONT FORK
1976 DT250C FRONT FORK 250B - C - 400B - C
1976 DT400C FRONT FORK 250B - C - 400B - C
1976 MX125C FRONT FORK
1976 RD400C FRONT FORK
1976 TY250C FRONT FORK
1976 XS650C FRONT FORK XS650C
1976 YZ100C FRONT FORK YZ100C
1976 YZ125C FRONT FORK YZ125C
1977 RD400D FRONT FORK
1977 TY250D FRONT FORK
1977 YZ100D FRONT FORK YZ100D
1978 RD400E FRONT FORK
1990 MOTOCROSS - YZ250A FRONT FORK
Hey, I told you guy's Yamaha keeps them simple, most of the time , till you go to a 79 RD 35mm forks
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'08 KTM 530 EXC
79 RD 400 Daytona
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Old 03-04-2012, 11:16 AM   #34
Cat Daddy
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Quote:
Originally Posted by Shocktower View Post
Hey, I told you guy's Yamaha keeps them simple, most of the time , till you go to a 79 RD 35mm forks
Yamaha still sells your seals too. 5.43 each

1T3-23145-00-00 OIL SEAL

http://www.powersportsplus.com/parts...145-00-00.html
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Old 03-04-2012, 11:38 AM   #35
Shocktower
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Location: Oregon City Orygun
Oddometer: 9,326
Quote:
Originally Posted by Cat Daddy View Post
Yamaha still sells your seals too. 5.43 each

1T3-23145-00-00 OIL SEAL

http://www.powersportsplus.com/parts...145-00-00.html
Yeah I know thank you though, I have learned so much since I bought my RD searching and searching, it is amazing there are still lots of stuff still out there Thank you
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'08 KTM 530 EXC
79 RD 400 Daytona
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Old 03-04-2012, 06:35 PM   #36
Andyinhilo
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Location: Hilo, Hawaii
Oddometer: 1,615
Fork seals

A quick search turned these up:

http://www.amazon.com/1968-1973-Yama.../dp/B006923CVC

and these OEM ones: http://www.mrcycles.com/fiche_sectio...973&fveh=51610

I think all of the DT yamahas used the same seals.
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Old 03-04-2012, 07:27 PM   #37
Hunsta
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Oddometer: 5,457
These come up for the RT1
http://stores.ebay.com.au/Motorcycle...&_sid=47423278
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Old 03-06-2012, 07:15 AM   #38
southforkspeedster
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so............must have been riding on Sunday............sure nice weather for it
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Old 03-09-2012, 07:46 AM   #39
Motoduc1
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Location: Nebraska
Oddometer: 927
Love it...don't quit!
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Old 03-09-2012, 08:38 AM   #40
Mrs forrest_fire1 OP
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Quote:
Originally Posted by southforkspeedster View Post


so............must have been riding on Sunday............sure nice weather for it
You know us so well! We had to check out the new single track trails that recently opened up in one of the riding areas.
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Old 03-14-2012, 12:10 PM   #41
bobfab
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Location: Westminster CO
Oddometer: 1,240
Great thread, keep it coming. I did a quick resto/shoepolish on a 76 DT125, they sure are fun and pretty bulletproof.
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Old 03-16-2012, 10:00 AM   #42
Mrs forrest_fire1 OP
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Location: Madras, Or
Oddometer: 19
Opps......

Great information my fellow adv riders have provided me! So I have no clue what I initially was looking at when I couldn't find OEM seals. Sure enough, I went back and the seals were available. I slapped my forehead ....thinking how could I have been so blind and then blubber to the internet world about not being able to find seals. Well.... needless to say, I ordered up a set of seals.


My husband finally got a chance to work on porting the piston. He took the new piston and was comparing it to the old one that I had and he thought they looked very similar in size. He managed to hunt out where I had left the cylinder head and tested how it fit and it fell right through. When I finally returned from work, my husband showed me that the piston I ordered was too small . It was .012mm bigger than the previous piston. When looking at the old piston, it was stamped .25 (so I assumed... lesson learned). I thought I was starting with .25 over, so ordering a .75 over was going to be plenty.... or so I thought.

I choose to change course from the reeds/porting cylinder. I took the other cylinder head and checked to see if the any of the pistons we had would work. The piston that I had in the miscellaneous box of parts would work.

I began prepping the new cylinder head, so I could take it to the machinist.



I had to remove the decompression valve.



And remove studs that were in place.



I also had to clean/scrape stuck on gasket and heavy grime.



I boxed the cylinder head and piston up and dropped it off at our local machinist to do his magic, aka bore and hone the cylinder to match piston.


Now I wasn't kidding when I first introduced my intentions for this rebuild that there were going to be trials and tribulations. Go ahead, laugh, I know you want to..... it's okay I already have. I've learned a lot during my project so far and I'm sure there will be many more learning experiences. I'm not going to give up on the reed/ported cylinder, but I want to get the bike going, so I choose the alternative to get the bike going the soonest .

Keep providing the excellent feedback, since all of you are helpful in providing information for me. Thanks for the help everyone and stay tuned!!!!
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Old 03-19-2012, 08:49 PM   #43
morena67
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Oddometer: 60
Suscribed... !
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Old 03-21-2012, 01:38 PM   #44
LC Garage
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You are doing great!
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Old 04-05-2012, 04:38 AM   #45
Mrs forrest_fire1 OP
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A step closer

Oh my.... where does the time go. I've squeezed in a few hours here and a few hours there working on the bike, but I haven't had a chance to post until now. Sorry to all those waiting for the next step!

The local machinist was very quick in getting the top end back to me. I think it was two days and it was delivered to the shop. I was surpirsed to hear from my husband that it was there and awaiting my return. When I finally got a break from my job, I headed in to the shop to apply a few hours of work to the bike.

I attempted to put the bike up on a bucket, so I can work on the bike with it in an upright position. Even though I put all my strength into it, there was no way I was going to get that bike high enough to place it on the bucket. I was caught off guard, because I've hefted my crf230 onto a bucket many times and didn't have a problem like this. It's surprising at how the weight distribution on bikes has changed so much over the years, as well as the advancement of the types of metal used within the bikes. So I gave in and asked Mr Forrest_fire1 to provide the brute strength that I lacked to place the bike on a bucket.



TA-DA! Such a keep and simple bike stand, that works so well.

I began with applying the new rings on the piston. Of course before I started I said a small prayer, in hopes that I wouldn't break the piston rings. Mr Forrest_fire1 has told me many stories of his past rebuild experiences and breaking many piston rings. It took me alittle bit, but I manged to apply both rings without breaking them!

Next step, I placed a clean rag over the open crank case, because I'm know to have butterfingers and drop all sorts of stuff and I would rather not have to fish out any parts. Knowing my luck if I were to drop something in the crankcase, it would be a teny tiny pin/clip.... Anyways. I fitted the bearing on the piston rod.



Then added on my new piston. The pin was a nice tight fit and eventually I manged to get the pin clips in place. I'm almost positive there is an easier way to place them, but I managed.

Waa-laa. New piston and rings applied.



This is where I stop on finishing the top end. I feel it will be easiest to have an extra set of hands when trying to install the cylinder head. Unfortunately the shop was very busy that day and Mr Forrest_fire1 was unavailable to assist.

My next project choice was to break into the carburetor. Which is easier said than done.




These are a few before photos, partly so I can remember what it's supose to look like when I attempt to reassemble the carburetor.

One experience that I got to enjoy all to myself, that I want to extend to the ADVrider community was the pungent, terrible smell of bad gas and oil that came from the carburetor.



I began disassembling the carburetor and keeping track of all the tiny parts I was removing. I then attempted to remove the float bowl and it wouldn't budge. I thought it was something I missed, so I rechecked to make sure I got all the screws out and double checked the repair manual. I didn't miss any screws, but the carburetor wasn't going to come apart. I went to seek out some advice on what to do next. Mr Forrest_fire1 dad showed me a trick for gentle leverage, that allowed us a big enough gap to apply some distilled alchol to clear away some of the grime. After multiple coats and some manipulation. We got the carburetor apart.





Well..... I think the picuture explains a lot. I'm unsure of how long that few has been in that carburetor. We decided the carburetor needed a good soak down. We removed all parts that could be damaged during the soak and set them aside. I of course took a picture to keep track of them (so i would know if something came up missing later). Smart thinking, right?



Then I put the carburetor in it's bath of distilled alcohol to let it soak away the goo, grime, oil, and gas.



This would be the spot that I had to stop at for the day. I learned so much about carburetors, because my father-in-law is very knowledgeable with small engines. He provided a few helpful hints in continueing my rebuild and some info that will help with future adjustments on the carburetor.

More to come, but unfortunatetly the time constraint has hit me again. Hopefully I will find some time very soon to add on to the saga.
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