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PostPosted: Tue Dec 12, 2017 5:49 pm 
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Joined: Mon May 15, 2017 3:32 pm
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Location: Seattle Washington
What is a good oil to use for the MT250's oil injection system that it currently available?

Thanks in advance :D

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'75 MT250 '75 DT400 '88 Husky XC430 '08 Ducati Hypermotard '09 Husky TE510


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PostPosted: Tue Dec 12, 2017 6:01 pm 
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Joined: Sun Nov 30, 2008 12:10 pm
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Location: Connecticut, USA
Bel-Ray Si-7 is an excellent 2t injector lube. Unfortunately, the MT injection system tends to significantly over-oil the engine, so you may want to adjust the oil-pump cable down a bit, run a hotter plug, etc.

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric


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PostPosted: Tue Dec 12, 2017 6:05 pm 
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Location: Seattle Washington
Thanks for the quick reply. :D

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PostPosted: Thu Dec 28, 2017 8:46 pm 
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Joined: Wed Aug 26, 2015 7:31 pm
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Location: Westford, MA
rayivers wrote:
Bel-Ray Si-7 is an excellent 2t injector lube. Unfortunately, the MT injection system tends to significantly over-oil the engine, so you may want to adjust the oil-pump cable down a bit, run a hotter plug, etc.

Ray


You mentioned to "...adjust the oil-pump cable down a bit..." I'm assuming you mean to loosen the cable at the oil pump and put a little more slack in the cable, correct? Any way to quantify or all trial and error?

Back in the day I seem to remember just jumping on mine, firing it up and away I went with a strong, smooth pull through the power band. Hoping to get this one running that way too.

Thanks.

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'74 MT 250
2010 Honda Gold Wing
2009 Kawasaki Concours 1400


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PostPosted: Thu Dec 28, 2017 10:11 pm 
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Joined: Sun Nov 30, 2008 12:10 pm
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Location: Connecticut, USA
Quote:
I'm assuming you mean to loosen the cable at the oil pump and put a little more slack in the cable, correct?

Yes. Both the bikes I worked on would surely still be over-oiled even with enough cable slack to keep the idle oil output up to @ 3,000 rpm. Pump output is dependent on both cable position and rpm.

Quote:
Any way to quantify or all trial and error?

Absolutely - disconnect the oil feed at the intake manifold and run it into a small plastic bag, plug the manifold hole, and run premix. You'll likely find the bike runs noticeably crisper, and you'll have a very good idea of pump output.

Ray

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