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Old 04-08-2011, 03:47 PM   #1
CHRIS,T
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Default Idle RPM speed

Hey guys
i went for a spin on the magna 750 and was wondering why the idle Rom was at 2000 rmp is that normal or is it just a sticky throttle cable ?
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Old 04-08-2011, 04:02 PM   #2
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Google it.






Seriously though. It should be around 1k rpm. If it is that high, maybe the choke is still engaged or the idle needs to be adjusted. What year is this?
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Old 04-08-2011, 04:07 PM   #3
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some say 1983 but all my paper work says 1985
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Old 04-08-2011, 04:15 PM   #4
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Magnas idle around 1k. Like WIP said, choke could be sticking, or the idle needs adjustment.
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Old 04-08-2011, 04:17 PM   #5
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Ok, it should def be around 1k rpm. Is the choke completely disengaged while this is happening? The idle should be adjustable at the carbs. You have to wonder if the person selling it adjusted it high for a reason. Maybe to hide a problem.
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Old 04-08-2011, 04:28 PM   #6
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the choke is completely off. and it runs good so ill check the carb to adjust it
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Old 04-09-2011, 07:26 AM   #7
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so i adjusted my carb but it seams to bounce between 1250 and 2000 rpm
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Old 04-09-2011, 09:05 AM   #8
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well i did some research and in other forums they say a hole in the exhaust can cause this problem? is this true
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Old 04-15-2011, 09:42 AM   #9
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I would check for an intake leak also. Air cleaner box secured? Carb to head tight?
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Old 04-15-2011, 02:27 PM   #10
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no leaks, air cleaner is secured and carbs are tight
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Old 04-16-2011, 12:46 PM   #11
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Your idle RPM can be set by the black knob adjuster coming off of the #1 carb.

Idle speeds for Magna's are generally 1200RPM's (is for both my 83 V65 and my 86 VF700).

You're probably due for a carb cleaning, new air filter, and a carb synch. All three you should consider routine maintenance.

Motorcycles require regular maintenance btw. If they don't get it, then they start going downhill quickly.

With all of the threads you have posted, I would suggest the following for your Magna:
  1. Fork Seals
  2. New Battery (if you haven't replaced it already)
  3. Brakes (Front & Rear)
  4. Carb cleaning (buy the gasket sets and replace the gaskets)
  5. New air filter (if you haven't replaced it already)
  6. New spark plugs (if you haven't replaced them already)
  7. Check/Set Valve Clearances
  8. Synch your carbs (you'll need a mercury manometer. Gauge sets are "ok" but the mercury is far better)
  9. Drain & replace the final drive oil
  10. Oil & oil filter change

IF the lead seal caps over the mixture screws on the carbs have been drilled out where someone was just dying to mess with the mixture, then put them back to the default setting for that bike (check the manual for the correct setting. Most are 2 1/2 turns out from bottom). If the seal caps are still there - don't touch them.

All of this, if done correctly, will give you a baseline to start from and shouldn't take a novice more than a weekend to accomplish.

Last edited by alalien; 04-16-2011 at 12:49 PM..
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Old 04-16-2011, 01:33 PM   #12
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[QUOTE=alalien;787156]

Thanks
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Old 04-16-2011, 03:06 PM   #13
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Quote:
Originally Posted by alalien View Post
IF the lead seal caps over the mixture screws on the carbs have been drilled out where someone was just dying to mess with the mixture, then put them back to the default setting for that bike (check the manual for the correct setting. Most are 2 1/2 turns out from bottom). If the seal caps are still there - don't touch them.
I'm not certain on the other Hondas, but all the duel carb Shadows seem to come from the factory with the idle mixture screws set incorrectly. I do not know if this was an issue with the Magna, but it may be worth checking into.

The stock setting on a 98 Shadow ACE is supposed to be 2 1/2 turns like you said for the Magna alalian. Mine were at 1 and 1 1/4 respectfully. After adjusting, my bike idled more smoothly and I got rid of most of the decelleration popping and backfiring that happened. If they have to be adjusted, I recommend the red silicone as a sealent afterwards.
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