<HTML>I own a '79 Batavus Regency, First of all is NOT FOR SALE. I normally use a NGK 7534, with a tight gap. I'm looking for possible opinions on using a more powerful plug, to increase potential in the bike's performance, Different Plugs, Special Features, etc. Thank You!</HTML>
<HTML>It's very easy to see if you're using the right plug:
If is it brownish, maybe with a hint of grey and without any deposits on it, than you've got the right plug, other plugs will get damped or cracked because of wrong heatvalues. The only kind of plug that improves performance is a threespike, the improvement is marginal and the price is astronomic (for a plug), so you're best off just using the plug with the right heatvalue.
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<HTML>I really hate those NGK plugs....
Try matching up with Champion Plugs, see if there is a cross reference from an NGK to a standard Champion plug, then cross-ref that number to a platinum plug, if one exists.
I did this with an 89 Tomos TT Golden Bullet, and the Tomos Trike and it did wonders for the performance, when you only use one plug, get the best out of it.
FYI - The champion index number for the Tomos plug is J82C, for those Tomos owners wishing to ditch those crappy NGK's
Also, try to avoid the Candian-Made Champion plugs, if you can, they do not seem to last nearly as long.
Ree.</HTML>
<HTML>Splitfire Also Carries them....SF-Series, they have 14 listed for Batavus, but didn't see Regency listed in there, you could check by motor style, however.
The Splitfire for Tomos A3/A35 - FYI - is SF409C, with a Gap of 0.50
Ree.</HTML>
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