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[REQ] 2-stroke oil ratio for Yamaha

 
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Sean1

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Since: Sep 04, 2003
Posts: 396



(Msg. 1) Posted: Wed May 23, 2007 5:19 am
Post subject: [REQ] 2-stroke oil ratio for Yamaha
Archived from groups: rec>motorcycles>dirt (more info?)

I have a '75 DT400 and I'd rather pre-mix the 2-stroke
mixture than trust the 30-year old metering - is it ok
to use 40 to 1?

This bike makes an raucous ringding exhaust sound
but it sure is fun.

TIA, Sean_Q_

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oldfart

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Since: Apr 17, 2007
Posts: 23



(Msg. 2) Posted: Wed May 23, 2007 5:19 am
Post subject: Re: 2-stroke oil ratio for Yamaha [Login to view extended thread Info.]
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On May 22, 8:31 pm, Sean wrote:
> I have a '75 DT400 and I'd rather pre-mix the 2-stroke
> mixture than trust the 30-year old metering - is it ok
> to use 40 to 1?
>
> This bike makes an raucous ringding exhaust sound
> but it sure is fun.
>
> TIA, Sean_Q_

40 to 1 is probably ok if you use the right oil. Check with your
Yamaha dealer and see if you can get the conversion kit to replace the
oil injection. It is only a few dollars and safely replaces the
injection stuff. OF

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Sean1

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Since: Sep 04, 2003
Posts: 396



(Msg. 3) Posted: Wed May 23, 2007 5:19 am
Post subject: Re: 2-stroke oil ratio for Yamaha [Login to view extended thread Info.]
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oldfart wrote:

> 40 to 1 is probably ok if you use the right oil. Check with your
> Yamaha dealer and see if you can get the conversion kit to replace the
> oil injection. It is only a few dollars and safely replaces the
> injection stuff. OF

Thanks for the clue... I'm not sure why I need to replace
anything (???) I've already drained the 2-stroke oil tank
and ran it on 40/1 pre-mixed fuel for 15 mins -- is that bad?

Anyway I'll ask at the local Yammy dealership.

Sean_Q_
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CrashTestDummy

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Since: Apr 29, 2005
Posts: 712



(Msg. 4) Posted: Wed May 23, 2007 8:18 am
Post subject: Re: [REQ] 2-stroke oil ratio for Yamaha [Login to view extended thread Info.]
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On Wed, 23 May 2007 03:31:42 GMT, Sean wrote:

>I have a '75 DT400 and I'd rather pre-mix the 2-stroke
>mixture than trust the 30-year old metering - is it ok
>to use 40 to 1?
>
>This bike makes an raucous ringding exhaust sound
>but it sure is fun.
>
>TIA, Sean_Q_

40:1 will work fine. 32:1 is also good.


Fred Bradford - CrashTestDummy
f.j.bradfordREMOVE RemoveThis @verizon.net
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CrashTestDummy

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Since: Apr 29, 2005
Posts: 712



(Msg. 5) Posted: Wed May 23, 2007 8:18 am
Post subject: Re: 2-stroke oil ratio for Yamaha [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

On Wed, 23 May 2007 04:20:43 GMT, Sean wrote:

>oldfart wrote:
>
>> 40 to 1 is probably ok if you use the right oil. Check with your
>> Yamaha dealer and see if you can get the conversion kit to replace the
>> oil injection. It is only a few dollars and safely replaces the
>> injection stuff. OF
>
>Thanks for the clue... I'm not sure why I need to replace
>anything (???) I've already drained the 2-stroke oil tank
>and ran it on 40/1 pre-mixed fuel for 15 mins -- is that bad?
>
>Anyway I'll ask at the local Yammy dealership.
>
>Sean_Q_

Ooops, didn't see OF's reply before posting mine. But to answer
this latest question, I think oldfart was talking about the hardware
to plug the various fittings where the oil tank supply lines
previously ran. On my son's former DT-80 I just found the appropriate
sized bolt and washer and screwed it into place.

Running it for 15 minutes on 40:1 ain't bad so long as you plugged
any holes previously occupied by oil the lines.



Fred Bradford - CrashTestDummy
f.j.bradfordREMOVE.RemoveThis@verizon.net
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sturd

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Since: Apr 17, 2007
Posts: 34



(Msg. 6) Posted: Wed May 23, 2007 1:54 pm
Post subject: Re: 2-stroke oil ratio for Yamaha [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Sean

> I have a '75 DT400 and I'd rather pre-mix the 2-stroke
> mixture than trust the 30-year old metering - is it ok
> to use 40 to 1?

FYI, in 35 years and counting of working on oil injected
Yamastinkers, I've never seen or heard of an oil pump
failure. I've seen cables that broke but even that is
very very rare.


Go fast. Take chances.
Mike S.
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Wudsracer

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Since: Jan 18, 2007
Posts: 234



(Msg. 7) Posted: Wed May 23, 2007 7:16 pm
Post subject: Re: 2-stroke oil ratio for Yamaha [Login to view extended thread Info.]
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>On 23 May 2007 09:54:12 -0700, sturd wrote:

>Sean
>
>> I have a '75 DT400 and I'd rather pre-mix the 2-stroke
>> mixture than trust the 30-year old metering - is it ok
>> to use 40 to 1?
>
>FYI, in 35 years and counting of working on oil injected
>Yamastinkers, I've never seen or heard of an oil pump
>failure. I've seen cables that broke but even that is
>very very rare.
>
>
>Go fast. Take chances.
>Mike S.


I once had the oil pump cable break on a TY250. (The cable going to
the carb was still working fine. Oops!)
After the engine rebuild, before each ride I would hold the cable
housing going to the oil pump while twisting the throttle, and make
sure the cable was still working.


Wudsracer/Jim Cook
Smackover Racing
'06 Gas Gas DE300
'82 Husqvarna XC250
Team LAGNAF
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Hustlin' Hank

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Since: Apr 17, 2007
Posts: 13



(Msg. 8) Posted: Thu May 24, 2007 7:23 am
Post subject: Re: 2-stroke oil ratio for Yamaha [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

On May 22, 10:31?pm, Sean wrote:
> I have a '75 DT400 and I'd rather pre-mix the 2-stroke
> mixture than trust the 30-year old metering - is it ok
> to use 40 to 1?
>
> This bike makes an raucous ringding exhaust sound
> but it sure is fun.
>
> TIA, Sean_Q_

Back inthe 70's, on bikes that were not oil injected, the mix was
pretty much standard at 20:1 using regular motor oil ( one quart of
10w-30 to a 5 gallon gas can). With todays oils, 40:1 is probably
fine.

Again, block any passage that will allow air into the crankcase.

Hank <~~~mixed up ...........mentally
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