Oil Pump Cable Adjustment (MC21)

**Tue Nov 29, 2011 2:37 am » Post: #1 » Download Post**

SUMMARY: tightened oil pump cable, engine ran poorly. loosened it to previous setting, runs fine. unsure if I should loosen it more (to factory setting)

I saw that the adjustment nuts on the oil pump cable had slack. Not knowing any better, I tightened the line (ie forcing more oil in at WOT). I noticed the bike was sluggish at low revs and was engine was dying. Normal for too much oil mixture?

I loosened the line and problem fixed, runs fine now. However, I found that even at the loosest setting, the valve is still much more open than the factory setting. It looks like the previous owner tightened it at the butterly as well. Is this strange?

I'm wondering if I should loosen it even more, to the factory setting. Or should I just leave it be. What's the ideal mixture, how can I check if it's adequate?

**Tue Nov 29, 2011 8:44 am » Post: #2 » Download Post**

Factory settings are rich as it is! Enrichening the pump setting beyond standard is a bad idea.
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Andy.
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**Tue Nov 29, 2011 9:25 am » Post: #3 » Download Post**

Roman250 wrote:What's the ideal mixture, how can I check if it's adequate?

I would hazzard a wild guess that the factory setting is ideal......
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**Tue Nov 29, 2011 11:30 am » Post: #4 » Download Post**

fontyyy wrote:
Roman250 wrote:What's the ideal mixture, how can I check if it's adequate?

I would hazzard a wild guess that the factory setting is ideal......

One would hope. But I'm hazzardous about resetting the pump to the factory setting as the previous owner went out of his way to make the oil mixture rich. The bike has been modified and raced. No cause for concern?

**Tue Nov 29, 2011 11:55 am » Post: #5 » Download Post**

Maybe the previous owner wasn't very well informed? Maybe the previous owner raced it without a pump, and slapped it back on to sell, and either (a) set it up rich "just in case", or (b) never even set it up at all?
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**Tue Nov 29, 2011 12:00 pm » Post: #6 » Download Post**

Ok yes that is definitely possible. I'll loosen it so that the marks line up as per the diagram and see how it works out. Thanks!

**Tue Nov 29, 2011 12:03 pm » Post: #7 » Download Post**

Of course... if you seize it... you never heard of NSR-WORLD.COM! Laughing

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Andy.
NSR-WORLD.COM

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**Tue Nov 29, 2011 1:12 pm » Post: #8 » Download Post**

Andy wrote:Of course... if you seize it... you never heard of NSR-WORLD.COM!

i shall not threaten lawsuit, i shall not threaten lawsuit, i shall not... Razz

**Tue Nov 29, 2011 1:16 pm » Post: #9 » Download Post**

I ran my NSR with factory oil pump settings with TYGA Exhaust, JHA Air box cover and HRC Jetting. Never had an issue.

If your using Honda's instructions for setting the pump I would think our okay. THey do know best (that and it's their fault if anything goes wrong and you followed their instructions Wink

)

But honestly, if memory serves me correctly, the factory settings are equivalent to around 28:1 (I am sure someone will correct me if I am wrong), I ran my race bike with no airbox, dog fight pipes, HRC cards and HRC jets at 32:1 and never had an issue on that bike. So if your at Honda factory settings, you should be getting more then enough oil.
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Charles Gallant

**Tue Nov 29, 2011 2:53 pm » Post: #10 » Download Post**

thats a relief to hear. im just a bit confused on what 'factory' setting is. the resources say it should look (roughly) like this at WOT:

http://img256.imageshack.us/img256/801/img1972a.jpg

but if i give it that much slack, then it wont start to open at all until later in the throttle turn... which i read should be simultaneous

Question

**Tue Nov 29, 2011 5:42 pm » Post: #11 » Download Post**

Line these two marks up at full throttle...

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Andy.
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**Tue Nov 29, 2011 11:04 pm » Post: #12 » Download Post**

Andy wrote:Line these two marks up at full throttle...

not the first index marker, like the diagram?

**Wed Nov 30, 2011 7:29 am » Post: #13 » Download Post**

Correct, the text in the technical resources area is wrong.

Also read this thread, you see the trouble I go to for you guys?
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**Wed Nov 30, 2011 12:16 pm » Post: #14 » Download Post**

fontyyy wrote:Correct, the text in the technical resources area is wrong.

Also read this thread, you see the trouble I go to for you guys?

Awesome. Know that somewhere in Tokyo a new NSR owner sleeps soundly tonight Very Happy

thx

Oil Pump Cable Adjustment (MC21)

Oil Pump Cable Adjustment (MC21)

Re: Oil Pump Cable Adjustment (MC21)

Re: Oil Pump Cable Adjustment (MC21)