Plug caps

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speedy
TRX-Enthusiast
Posts: 32
Joined: Sat Jan 15, 2011 9:48 pm
Location: Norfolk UK

Plug caps

Post by speedy » Sat May 30, 2026 6:33 pm

Hi all! Anyone in UK replaced their plug caps lately? I have one that's open cct so tried my local Yamaha dealer The alleged original one at about £60 each and they appear different to mine They couldn't find a likely replacement after going through all the catalogues, I got some on approval but found them too short They are advertised on ebay but dubious about fit BTW its not the resistor, oc measured without resistor and spring etc
Regards
Speedy

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Snod Blatter
TRX-Enthusiast
Posts: 413
Joined: Sun Sep 16, 2012 8:40 am
Location: Worksop, UK

Re: Plug caps

Post by Snod Blatter » Sun May 31, 2026 1:14 pm

They look a lot like standard NGK XD05F caps to me, but with slightly different rubber bits that could surely be transplanted to the new ones. Strangely I can't find any confirmation on this, I would've expected it to be a fairly common question with all the TDMs sold over the years. My only worry from the pictures is that the elbow has too much of a bend so the lead rubs or won't quite bend enough, you might have to be the guinea pig on this.

If you get desperate I remember some coil-on-plug/stick coils from an R6 would fit but of course it comes with some hackery.
'95 4NX with K&N filter, Motad Venom cans, YSS PD valves, Ohlins fork springs, 530 C+S, Green CDI, 11/16 radial master cylinder, +30mm jack up dog bones. Enjoyable money pit.

speedy
TRX-Enthusiast
Posts: 32
Joined: Sat Jan 15, 2011 9:48 pm
Location: Norfolk UK

Re: Plug caps

Post by speedy » Sun May 31, 2026 8:14 pm

The shop gave me some XD05F-R to check out but they are slightly too short Anyway I had one dodgy one so cut it in half, fixed the connection and araldited it back together...so far so good! Wonder if anyone has 3d printed these things
Speedy

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