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Makotosun

73 Yamaha dt3 250 top speed

  • Josgnal87
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73 Yamaha dt3 250 top speed was created by Josgnal87

I have a 73 Yamaha dt3 250.Can't get it go any faster than about 35 mph. Timing seems good. Spark is good. Carb is clean. I can see a little exhaust leak at the cylinder right where the pipe is. Could this be causing it?
16 Jul 2022 08:08 #1

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Replied by Sneezles61 on topic 73 Yamaha dt3 250 top speed

Can I borrow from RT325…..?
Is the exhaust pipe clean? May need to burn it in the fire pit to clean it up right.
Sneezles61
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16 Jul 2022 08:39 #2

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Replied by RT325 on topic 73 Yamaha dt3 250 top speed

Can i borrow it back off Sneezles61 & second it lol--Exhaust. Seriously though, we need a bit more info. Is it the small Oring on the jet setter in the bowl. If not sealing properly it'll drown out like the main jet fell out--go super rich like the choke is on & then some, in a bad case. & yours sounds bad. But back to the exhaust.
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16 Jul 2022 21:50 #3

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Replied by MarkT on topic 73 Yamaha dt3 250 top speed

I'm not sure what "timing seems good" means...  timing is either set correctly or it's not.  These bikes will run...  albeit not too well...  with timing pretty far out of whack. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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16 Jul 2022 22:34 #4

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Replied by Josgnal87 on topic 73 Yamaha dt3 250 top speed

I burned the exhaust in a burn barrel. A healthy bit of smoke came out. The carb. Yes that oring is smoked. Waiting on a carb kit in the mail right now. Would the oring cause it to foul plugs often. I only get a few hours from a plug. 
12 Aug 2022 19:19 #5

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Replied by Josgnal87 on topic 73 Yamaha dt3 250 top speed

I misspoke. The timing is correct. And by that I mean by the book. 0.126" btdc. Or 3.2 mm. 
12 Aug 2022 19:23 #6

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Replied by MarkT on topic 73 Yamaha dt3 250 top speed

Jet setter o-ring is critical.  Will run way rich if it's bad or leaking. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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12 Aug 2022 20:43 #7

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Replied by Josgnal87 on topic 73 Yamaha dt3 250 top speed

Thanks my quest for today is finding that o ring. I'm gonna hit up the local hardware stores and see what I can find. And if none of those work I'll order them.
13 Aug 2022 05:31 #8

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Replied by Gr8uncleal on topic 73 Yamaha dt3 250 top speed

Yamaha still sell them, so buy one of those to avoid any doubt.
13 Aug 2022 05:45 #9

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Replied by Ht1kid on topic 73 Yamaha dt3 250 top speed

Auto parts store might have them they would probably be gas resistant like Napa auto parts 
Last edit: 13 Aug 2022 06:20 by Ht1kid.
13 Aug 2022 06:18 #10

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