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1970 Yamaha AT1B

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1970 Yamaha Enduro AT1-B 125 Page

Welcome to the 1970 Yamaha AT1-B Forum. The factory paint color was called "Competition Yellow". The USA vin number range is: AT1-120101 to 138890. Feel free to post anything related to this model in the category. Anything new, will be added to this section. If you see any errors, please contact me privately.


                     

                    1970 Yamaha AT1-B Specifications


            Model 1970 Yamaha AT1-B


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1970 Yamaha AT1B Tribute Video



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1970 Yamaha AT1B 125 Parts

Any new parts, for the 1970 Yamaha AT1B, will be added here.

248-24173-00-00 Yamaha Enduro Fuel Gas Tank Rubber Band Strap DT1 RT1 CT1 AT1 | Yamaha Enduro
www.legends-yamaha-enduros.com
248-24173-00-00 Yamaha Enduro Fuel Gas Tank Rubber Band Strap DT1 RT1 CT1 AT1 | Yamaha Enduro
Sale This part is no longer available from Yamaha. It has been discontinued. This part is a new reproduction of the original. The originals have deteriorated with time, as they are very old. The part number is used for reference purposes only, and no source of manufacture or supply is implied. The price includes sales tax. If you want additional insurance coverage, contact me before ordering. If you do not purchase insurance, I am not responsible for mis-delivered packages, lost packages, or shipping damage. Fits the following models:Part # = 248-24173-00-00Part Description = BAND,TANK FITTINGModel Count = 32AT1B 1970 125 AT1 Enduro Dual-Purpose AT1C 1971 125 AT1 Enduro Dual-Purpose AT1E 1969 125 AT1 Enduro Dual-Purpose AT1M 1969 125 AT1M Enduro Dual-Purpose AT1MB 1970 125 AT1M Enduro Dual-Purpose AT1MX 1971 125 AT1MX Enduro Dual-Purpose AT2 1972 125 AT2 Enduro Dual-Purpose AT2M 1972 125 AT2M Enduro Dual-Purpose AT3 1973 125 AT3 Enduro Dual-Purpose ATMX 1973 125 ATMX Enduro Dual-Purpose CT1 1969 175 CT1 Dual Purpose CT1B 1970 175 CT1 Dual Purpose CT1C 1971 175 CT1 Dual Purpose CT2 1972 175 CT2 Dual Purpose CT3 1973 175 CT3 Dual Purpose DT1E 1971 250 DT1 Dual Purpose DT1MX 1971 250 DT1MX Dual Purpose DT2 1973 250 DT2 Dual Purpose DT3 1973 250 DT3 Dual Purpose HT1 1970 90 HT1 Street HT1B 1971 90 HT1 Street HT1BM 1971 90 HT1BM Dual-Purpose LT2 1972 100 LT2 Dual-Purpose LT2M 1972 100 LT2M Off-Road LT3 1973 100 LT3 Dual-Purpose LTMX 1973 100 LTMX Off-Road RT1 1970 360 RT1 Off-Road RT1B 1971 360 RT1 Off-Road RT1M 1970 360 RT1M Off-Road RT1MX 1971 360 RT1MX Off-Road RT2 1973 360 RT2 Off-Road RT3 1973 360 RT3 Off-Road

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Confused

Hello first time on this forum. I just bought a 1970 Yamaha 125 enduro. Yellow tank. The engine case and frame calls it an AT1. It’s got 5600 miles on it. The stock piston is toasted. I’m having a really hard time finding the right 2nd over piston. I’ve received 2 both are wrong. To big by a lot. I’m obviously doing something wrong. I’ve bought a 285-11636-00-00 and 251-11636-00-00 both are like way ttoobig. Stock bore is 56mm witch is like 2 1/4 inch diameter just for an example. The ones I’ve received are like 2 5/8 inch diameter. I’m getting a mm gauge tomorrow. Point is what am I doing wrong? Any help would be very much appreciated.

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Enduronut
Enduronut
Apr 09, 2024

Sorry to hear that .... Yes, oil inside the timing cover strongly suggests a bad oil seal, as you've already mentioned.

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