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bad starting when hot.

  • Aubs
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bad starting when hot. was created by Aubs

Hi , I have an ex USA 1973 DT250      Starts easy when cold and runs well . However when after a good run engine is stopped and tried to restart will not fire up on kickstart.   New plug ,points and condenser recently fitted. Using ethanol free fuel with 50-1 ratio.   Hope someone can help.  Possibly not related but fuel filter bowl is never full but I never seem to suffer from fuel starvation..     Aubs from Wales.
02 May 2021 06:12 #1

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Replied by Xtgeezer on topic bad starting when hot.

Hi there I have the same bike with the same issue do you have any answers on this issue please? 
02 May 2021 11:17 #2

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Replied by JayB on topic bad starting when hot.

Could be that it is on the rich side when hot.  Don't use the choke when starting hot.  Try holding the throttle 1/2 to fully open when starting hot.  If you pull the carb make sure the float setting and needle clip position are correct.
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Last edit: 02 May 2021 12:17 by JayB. Reason: corrected spelling
02 May 2021 12:17 #3

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Replied by MarkT on topic bad starting when hot.

Do you have the insulator spacer between carb and engine? 

How much time is passing before trying to restart?
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
03 May 2021 07:22 #4

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Replied by Hammer on topic bad starting when hot.

Aubs,

The 1973 was, in the US at least, the DT-3, and not a DT250; this could help when looking for rare replacement parts.
On starting, when cold, use the Choke, and DON'T TOUCH THE THROTTLE!  When warm, use no choke and about one-third of throttle travel and kick when the piston is at TDC.

Hammer
"Who, More than Self, His Country Loved."
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03 May 2021 21:09 #5

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Replied by Aubs on topic bad starting when hot.

Hi MARKT     I assume you are refering to the valve plate .  Has been removed and checked. Time to restart after long run about 1 hour.
04 May 2021 01:07 #6

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Replied by MarkT on topic bad starting when hot.

I'm talking about the insulator spacer between carb and engine.  Yamaha calls it an "intake manifold".

Should be an o-ring on end of carb, insulator, then gasket, then reed manifold. 

Without an insulator, carb will soak up excessive engine heat which can make it hard to start when hot.

 



.
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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04 May 2021 07:25 #7

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Replied by Aubs on topic bad starting when hot.

Hi MARKT,  THANKS FOR THE REPLY.   i WAS NOT AWARE OF THE PURPOSE OF SPACER. . i DO HAVE  SPACER AND "O" RING IS IN GOOD ORDER.
05 May 2021 01:01 #8

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