Projected spark plug

[sr50r]

I'm soon going to have an unneeded, very lightly used CPR8E (+/- 300km) as I've finally recieved the exotic ZMR7AP plugs I had ordered for my Aprilia.

Supposedly, projected plugs offer advantages over standard type, and I quote:

One very useful variation of the standard spark plug has its insulator nose and electrodes extended from its metal shell. The projected-nose configuration moves the spark gap a bit farther into the combustion chamber, which tends to improve efficiency by shortening the distance traveled by the flame front and also making the combustion process more regular. But there is a more important benefit: the projected-nose plug provides, in many engines, what effectively is a broader heat range than you get with the conventional flush-nose type. The projected nose is more directly exposed to the fire in the combustion chamber, and quickly comes up to a temperature high enough to burn away fouling deposits after ignition occurs. Then during the subsequent intake phase this plug's exposed tip is cooled by the swirling air/fuel mixture. In this fashion the higher temperatures existing at full-throttle operating conditions are to some extent compensated by the greater volume of cooling air, and the net effect is to make the projected-nose plug better able to cope with the conflicting demands of traffic and highway travel.

Seems meant for a city dwelling, always-at-WOT scooter right?

Question: Is there a clearance issue in the chamber with a projected plug?

Right now the ruck has a CR8E (as specified) fresh from the start of the season (already has over 1000 km on it tho), so if there are no issues with the smashing the piston into it, I'd love to give it a try.

[chanito]

Yes there is, both the stock and the big bore pistons need a dent in the piston top to clear the stock spark plug, an extended nose spark plug will have a fun time with the top of the piston, ending in disaster

[sr50r]

;_;