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Male pep71
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1974 Suzuki TM250 Reply to this Post

Hey gang,

Just purchased my first vintage bike, a 74' TM250.

It has the original oil injection system installed. The man who built the bike explained to me that unless you modify the cases with a weep hole, you shouldn't disable the oil pump and pre-mix the gas or you will starve the left side main bearing of oil. The right side is lubed from the clutch compartment oil. I have been told that the system is very reliable and without the case mod you should leave it in place.

Two questions for you vintage guys and gals who might have knowledge on this bike. One, is this accurate information, and two - what oil would you recommend for the injection tank?

Looking through the oils available I see some that say "pre-mix only" and some that say good for both pre-mix and injector systems. The only thing I am sure of at this point is to pick an oil that says it is suitable for injection systems. My instinct is to not use a "modern" synthetic oil since that didn't exist in 74' and maybe it won't jive with the seals in the pump etc...

Thanks in advance for the help!
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Pino Farinola #71

125PV
82' RM125

40+ C/D
14' YZ250
11' YZ125

Godspeed Huck
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Re: 1974 Suzuki TM250 Reply to this Post

Try Wes on 249 i think.
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[Edit 1 times, last edit by rounder]
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Re: 1974 Suzuki TM250 Reply to this Post

Pep,

Let me get in touch with Vintage Dave & see what he remembers about removing the oil injection on the 74" 250 Champion.

Dave said that Bel-Ray Si-7 will work or any good injector oil.
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[Edit 1 times, last edit by Bigmaico]
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Re: 1974 Suzuki TM250 Reply to this Post

Thanks Howard, thanks guys!
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Pino Farinola #71

125PV
82' RM125

40+ C/D
14' YZ250
11' YZ125

Godspeed Huck
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Re: 1974 Suzuki TM250 Reply to this Post

Hey Pino that's cool!!!

Tom Shackleford would also have a very good idea on the Suzi experience. His kid races a TM250 in vintage and has done so for quite some time.

There's gotta be a website for TM's.
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....Mod10 ROCKS!!....
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Re: 1974 Suzuki TM250 Reply to this Post

Thanks Larry, I spoke to Tom on Facebook. He gave me some good info. See you at the races!
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Pino Farinola #71

125PV
82' RM125

40+ C/D
14' YZ250
11' YZ125

Godspeed Huck
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cool   Re: 1974 Suzuki TM250 Reply to this Post

I am switching to Motul 710. Yes I have been using 927 for around 4 years with no issues. But after some research and reading the label(needed my cheaters on actually), not designed for oil injection. It CAN BE too thick for the oil injection system. Maxima Super M is another suitable oil.
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Re: 1974 Suzuki TM250 Reply to this Post

So my research and advice from people with much more experience than me, led me to buy two different oils to start off with and evaluate. First I bought some Maxima Super M which is a synthetic blend, and some Bel-Ray Si-7 which is a full synthetic. Both say they are made specifically for auto lube systems. I also bought a bottle of Bel-Ray SL-2 which is another semi-synthetic which says suitable for both injector and pre-mix.

I don't think I can go wrong with either of those oils. I am more concerned with the oil pump/injector system actually doing it's job. The manual has a very simple recommended way to determine if the oil is actually moving through the lines as intended...it says change to a different color oil than you currently have in the tank, and see if the lines change to the new color after a few minutes of riding. Comical, but it seems simple and intuitively effective. With all these different color oils I bought I will be able to easily put the system to the test, I just can't wait to get out and ride this bike!
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Pino Farinola #71

125PV
82' RM125

40+ C/D
14' YZ250
11' YZ125

Godspeed Huck
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Re: 1974 Suzuki TM250 Reply to this Post

Awesome Pino. When you gonna try to hit the track, it's really hot. I haven't ridden in a long time. Getting the ants in the pants, just don't know about the heat.
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74 400 CR Husky x 2
78 YZ 100
76 YZ 100
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Re: 1974 Suzuki TM250 Reply to this Post

Alvin - planning on a test ride this Sunday at Ultimate with Greg Conn and Randy Howell. Dust off your boots and come on out!
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Pino Farinola #71

125PV
82' RM125

40+ C/D
14' YZ250
11' YZ125

Godspeed Huck
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