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Post subject: Rd500 Plug Fouling
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JohnyH  Regular Racer Joined: 03 Aug 2003 Total posts: 330 Location: Gloucester |
My 500 (1GE) keeps fouling the rear plugs (170 main jets), the front cylinders are running fine (165's). I am thinking of changing the rear jets to 180's. Would this help and/or is there something else I should be looking for.
Cheers
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Posted: Tue Jul 08, 2008 7:16 pm
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candy4lo All-gear Wheelie! Joined: 03 Feb 2004 Total posts: 1528 Location: dorset |
Hi Johnny
wot plugs u running,are they new/recent,shouldnt need to re-jet,dont think that will help.
if you do alot of town work you could run 8,s as Gareth recommended this makes them run cleaner,is oil pump set correctly?
Matt
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Posted: Wed Jul 09, 2008 12:54 pm
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| glennspove What's an RZ? Joined: 26 Feb 2008 Total posts: 6 Location: SVERIGE |
I had the same problem with my 500. I changed my airfilter and removed my oilpump and switched to 2,5% premix. Since then no problemo.
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Posted: Wed Jul 09, 2008 1:01 pm
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z1100r Ace of Spades Joined: 05 Aug 2003 Total posts: 4745 Location: Coventry |
I assume std carbs....std airbox and filter...filter not too heavily oiled.
Make sure oil pump is not on too much....I have been over the top on the adjuster and it can foul plugs easy. That oil cable that goes to the servo wants to be only just moving when the throttle is twitched..not holding the oil pump allready open even before you open the throttle. (Powervalves have to be closed for this test - turn ign off halfway through clean cycle or have engine ticking over) you can just back off oil cable adjuster until it stops moving when you slightly touch throttle. They have to move simultaneously from both being off if you understand what I mean.
170's should be OK...160's would best....I would not go 180's with std setup..your making it even richer....160's would be the best way to go. There are strange that things screw it all up though...crushed elephant ears have a huge effect (people forget the distance tubes and then keep winding screws up).....dripping wet oily air filter does too.
When messing with this lot the most importatn thing to remember is when you go out and test it...if the bike doesn't feel like it wants to go...take it straight home and dont force it...you will seize it or burn hole...something is wrong.
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Posted: Wed Jul 09, 2008 1:34 pm
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masterbillAll-gear Wheelie! Joined: 04 Aug 2003 Total posts: 1515 Location: Salisbury Wilts |
Hello,
Just my 5 pence 
I would swap coils around and see if it continues to happen, I would check the earths/coil connections and make sure they are good.
It might be that you have a weak spark on the rear 
If I`m happy with the electrickery then I would look for something else 
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Posted: Wed Jul 09, 2008 2:24 pm
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EngieRegular Racer |
Had the same problem with mine, fouling the rear plugs, and it was float levels/float needles worn. I think the carbs that feed the rear cylinders are lower so petrol pressure is higher. Just another possibility to eliminate.
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Posted: Wed Jul 09, 2008 6:30 pm
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JohnyHRegular Racer Joined: 03 Aug 2003 Total posts: 330 Location: Gloucester |
Thanks for all the advice Guys,
The bike has standard carbs, filter and box and is currently using NGK BR9HS, I have run 8's but changed to 9's in an attempt to cure this problem. It tends to happen on start up, I've done a couple of trackdays and it didn't miss a beat.
So I will start at the top and work my way down, should keep me busy for a couple of nights!
Cheers
John
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Posted: Wed Jul 09, 2008 9:23 pm
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KX3 Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1188 Location: Québec |
| JohnyH wrote: |
Thanks for all the advice Guys,
The bike has standard carbs, filter and box and is currently using NGK BR9HS, I have run 8's but changed to 9's in an attempt to cure this problem. It tends to happen on start up, I've done a couple of trackdays and it didn't miss a beat.
John |
9 will fool sooner than 8....
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Posted: Thu Jul 10, 2008 12:00 am
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| p51bombay Joined: 23 Jan 2004 Total posts: 9869 |
| KX3 wrote: |
| JohnyH wrote: |
Thanks for all the advice Guys,
The bike has standard carbs, filter and box and is currently using NGK BR9HS, I have run 8's but changed to 9's in an attempt to cure this problem. It tends to happen on start up, I've done a couple of trackdays and it didn't miss a beat.
John |
9 will fool sooner than 8.... |
Fool?.................you may be right, I thought 500's were designed to eat plugs
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Posted: Thu Jul 10, 2008 1:34 am
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KX3Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1188 Location: Québec |
o or u, the result is the same 
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Posted: Thu Jul 10, 2008 3:38 am
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z1100rAce of Spades Joined: 05 Aug 2003 Total posts: 4745 Location: Coventry |
BR8's(road use)...lightly oiled filter...nodders removed..160 mains...oil pump set right...floats set right...should fly...and never foul a plug
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Posted: Thu Jul 10, 2008 10:43 am
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second of three Daily Burner Joined: 13 Aug 2003 Total posts: 150 |
| z1100r wrote: |
| BR8's(road use)...lightly oiled filter...nodders removed..160 mains...oil pump set right...floats set right...should fly...and never foul a plug |
wots a nodder????????
and..... eleflump ears...... has the world gone mad..(wibble)
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Posted: Fri Jul 11, 2008 4:38 pm
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