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Old 28-07-2020, 09:41 PM   #1
Davy
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94 M900 spark plugs

I’m going to start to try and figure out why my monster is backfiring. So I’ll start with some new plugs as I don’t know how old they are. Is there a certain plug you guys recommend.
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Old 28-07-2020, 10:32 PM   #2
Mr Gazza
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NGK every time.

I use NGK DCPR8E (type 4339).

Type 4339 simple means that the nipple is detachable from the threaded end. It depends upon the type of plug cap that you are using as to whether you need the nipple on or off.
My caps go on the bare thread, hence why I need the detachable nipples. I destroyed one trying to get it off when I ordered the wrong type once!

I usually change mine every 6000 miles as the manual states but the current pair have gone way beyond that with no problems.
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Old 29-07-2020, 09:57 AM   #3
the lodger
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Just be careful if you buy cheap NGKs off ebay as there are lots of fake NGKs around. There are videos on youtube on how to spot a fake but if you buy from somewhere with a good reputation you'll be fine
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Old 29-07-2020, 02:05 PM   #4
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Quote:
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NGK every time.

I use NGK DCPR8E
Seconded, I usually get NGK plugs from ASC, they're over in Newtownards, NI but are on ebay etc. Genuine articles at good price and delivery.
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Old 29-07-2020, 04:15 PM   #5
Mr Gazza
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I buy them a little cheaper in sets of 4 for cars.. Not like I'm ever going to not need them..
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Old 29-07-2020, 04:57 PM   #6
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Thanks lads I’ll phone ASC and get some ordered. And good point about the fake jobs.
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Old 11-10-2020, 04:57 PM   #7
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Just to update on this. After reading about the fake plugs I just ordered them from my local bike shop knowing they would be good, So I fitted the new plugs put some fresh juice in the tank. And no more backfiring and she’s running sweet as a nut. Now I’m not sure if it was the old fuel or the old plugs. But I don’t care. She’s running sweet. Thanks for all the advice lads.
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Old 11-10-2020, 07:36 PM   #8
uncle duke
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I'm back to plain old DCPR8E ones again after my brief (very brief) change to NGK Iridium it just didn't run well with them..
On a different note managed a 100mile + adventure today dodged the odd shower but great fun after the previous few washed out w/e's
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Old 11-10-2020, 09:00 PM   #9
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I'm back to plain old DCPR8E ones again after my brief (very brief) change to NGK Iridium it just didn't run well with them...
Did you run them with larger, 1.00 mm gaps or with the standard gap for OE plugs? The centre electrodes of iridium plugs are too thin to create a fat enough spark with the smaller gap. I've been running them on my Evo with a 1mm gap for over 10k miles now with no problems.
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