71 T350 pilot jet #2 issue

[roostking]

Hi

Well I had one real badly corroded carb and had to drill and use an easy out to remove the top pilot jet. It's the 0.7 spec I think it's called pilot #2 in the parts fiche. The other pilot came out like nothing #35.
Find out that it's no longer available. Grrrr
Any one have an idea if these are out there some where. I haven't located them anywhere.
I suspect it's a 0.7 but can find a marking on the good one from the other carb. Any idea on where to look to find it?

As found jetting: main 112.5, pilot #35, pilot #2 0.7, needle 5d03 , cutaway 2.5

Thanks

JB

[Vintageman]

I had a very hard time finding them but someone here had just one they could spare:

If I could not have gotten one I was going to use a Mikuni - BS30/97-0.7 - Air Jets, 0.7.

But the outer thread too small for cab body. The thread in the carb body is the same as the pilot air screw if I recall.

I was going to use one of them (have many of those) drill it and fit (press may be enough) the air jet into it... not much extra dia to work with.

Or, ???

Just found this one

http://www.jetsrus.com/a_jets_by_carbur ... 5_air.html" onclick="window.open(this.href);return false;

Maybe right outer thread??? Not sure how to cross 0.7 flow to this series

I think Suz said #2 prevents stalling when you let off throttle or something (Check T305 or T350 service manual?). Never tried without them on my T305 or T350. The gent who gave me his spare (Ivan’s Performance) said it makes a difference and should be used: Don't recall why

You did not list Needle Jet size. I am all but sure yours is pitted inside the barrel where the metering occurs.

It’s a 182 series for 70-72 T350 and think it obsolete at least in that size. You can use a 159 series, what I did on both my bikes. You are suppose to convert from round main jet ( what 182 is designed for) to hex (what 159 series is designed for) . But I'll tell you, the round will cross thread into just fine You won’t even know that it did. Holds perfectly. You can do the cross of course. done it both ways... don't really believe the round to Hex cross table... well, never seams to work when I did and always a need couple steps richer when I used Hex (lean otherwise if I am right). When you use the round you know its correct for stock bike

[Alan H]

What about using early GT550 carbs?
They must be similar guts as the bikes use the same pistons.
They do come up on ebay from time to time.
Just a thought.

[tz375]

Do you have a picture and dimensions of the good jet so we can see what you are looking for.

182 series are still available and take Hex main jets. 172 are the same needle jet to take round main jets as far as I can determine. 172 do not appear to be available as an aftermarket jet, but I have not looked very hard. They were replaced by 169 series, but the spigot is 1.0mm thinner so the needle jet will sit slightly lower in the carb body and that will have a minor impact on high RPM/WOT fueling.

[Vintageman]

182 series are still available and take Hex main jets.

Almost sure 182 is round and 159 series is hex.

182 may be avaible but not in that size. If I could have have found a 182 for the T350 or T500 would have used it?

T305 had the 159 series with Hex... first T350s did too

I run 159s and use hex as designed or round as not designed.

I suppose if I am wrong again someone will correct me

The T350 is a larger carb than GT550 (32 vs 28). The 32 mm carb on the T305/T350 is to me what makes that bike unique.

It also responds well to a little more intake port timing- area with that carb on. And, it's or perfectly fine just as is! Back then Suz bragged about how well that worked and balance that design between a fast little 315cc twin with great streat manners.

I would try to fit the air jet somehow, next I would try it without pilot #2 before I gave up on it. If I was to repalce it I would use another 32mm VM series and copy jetting. You won't have a pilot #2 then either

Fun Stuff

[roostking]

No idea on the needle jet as of yet as they are still stuck in the carbs. Hope to get them out soon.
I will get a pic of the good jet.

I was thinking of just eliminating the thing all together but was wondering if the chamber in between the 2 jets was an emulsion chamber of sorts and might affect the pilot cct if removed.

I might have a lead on a parts bike in my area. I think I will have to follow that as I have a few other hard to find parts I need to get.

I usually have good luck with gunked up carbs but this one was a real bugger. When I finally got it removed there was a thread stuck in the jet's threads that caused the problem.

[Vintageman]

but was wondering if the chamber in between the 2 jets was an emulsion chamber of sorts and might affect the pilot cct if removed.

I don't think so... I have some spare carbs (somewhere) and will look again, but thought it was just to prevent engine from stalling if you quickly close throttle... That would not have been a good thing in city traffic and may have been a safety concern for Suz. It's explained somewhere buy Suz (service manual?). Ivan though it was for some other reason too, but could not recall (contact him?)

But please check everything I say for yourself too, but just an FYI for have messed with three of these old girls in my life and still have two now (or least their) top ends running. But all mine had that #2 installed. And yes it does not stall if I let off

[tz375]

I just checked and 182 is hex for sure. Round does not screw in. 159 is alos hex and they look similar but there are subtle differences.

188 is the round jet equivalent of a 159 series IIRC.

This secondary pilot jet thing is interesting though.

[Vintageman]

My mistake I am mixing my series 182 with 188 - sorry. What every the T350 (later) and T500 came with is round (188 - check when you pull it out)). Could not get it (188) in size needed and thus used 159 series with round or hex as stated. 159 is designed for hex, but again round fits well (I think H2Rick has a paper on that as well when he compares jets). MyT305 and T350 using 159 with rounds sized per Suz and My T500 using 159s with Hex (few step larger than what the cross said it would be... maybe just the way I like it tuned.... no pinging ).

Being able to use 159 is wonderful... fresh shinny jet


The 169 is 1mm shorted than 172 as stated (the 172 is used by later GT550 and GT250 with 28mm). It is best to use the 169 as is and drop needle leaner one clip (which is 1mm as well). If you shim up the 169, 1mm, the air hole may not line up well with air intake from bell mouth.

Again being able to use 169 in place of 172 is a nice shinny option

The bikes that are tough to find new needle jets are for example GT380 (Ivan Performance), early GT550...