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72 T500 J - Carb Needles and Needle Jets
Posted: Wed Aug 28, 2013 12:17 pm
by Syd
Does anyone know where I could get these parts as not much luck in Ebay so far.
2 x Jet needles (5FP8-3) 13383-15600
1 x Needle jet P-4 (09494-00051)
1 x Needle jet P-5 (09494-00056)
Re: 72 T500 J - Carb Needles and Needle Jets
Posted: Wed Aug 28, 2013 1:14 pm
by argo1974
GTReiner in Germany has those parts on stock.
Re: 72 T500 J - Carb Needles and Needle Jets
Posted: Wed Aug 28, 2013 2:49 pm
by oldjapanesebikes
argo1974 wrote:GTReiner in Germany has those parts on stock.
His email is
GTReiner1@aol.com, and the other two sources are Manfred (also in Germany at
schoenherr.kelkheim@t-online.de), or give Paul a call - contact info is at
http://www.reproductiondecals.com/paulmiller.html" onclick="window.open(this.href);return false;.

Re: 72 T500 J - Carb Needles and Needle Jets
Posted: Sat Aug 31, 2013 8:19 pm
by Syd
Thanks for the info - Reiner has confirmed he has some Jet needles # 13383-15600 and the following
- Needle jets P-4 (09494-00051) - no more available
- Needle jets P-5 (09494-00056) - in stock
You could use two P-5 jets instead of one P-5 plus one P-4.
I do not know anything about the P-4 & P-5 needle jets, therefore is he correct saying you can use two P-5 needle jets instead?
Re: 72 T500 J - Carb Needles and Needle Jets
Posted: Sat Aug 31, 2013 11:23 pm
by oldjapanesebikes
P-5 should run slightly richer than P-4, but I think they are still available as Mikuni parts. Just do a Google search for a P-4. I also suspect that unless there is physical damage, you should be able to clean the old ones and re-use them, but there are better qualified folks on the board who can confirm that. The needle itself is worth replacing if it is at all pitted or notched - for the other jets, a good clean will often do wonders.

Re: 72 T500 J - Carb Needles and Needle Jets
Posted: Mon Sep 02, 2013 8:57 am
by tz375
Check whether the existing jets are 188 or 159 series. They are probably 188. If so there are not a lot of them around, but check all the on-line stores for Mikuni 188 P-4
P-5 will, as Ian mentioned, be slightly richer in the midrange but I suspect that you won't notice it.