What a royal kick in the ass T350

[Vintageman]

What sucks is either the 1969 service manual is wrong or Suz Spec-11 for 1969

As I said my guess is Spec-11 for 1969 is wrong. Thus DP2 needle equivalent you have belongs with Q0 sized needle jet not P6 (5DL13 needle)

The DP2 is fatter (leaner) soon as you get a way from using the very end (not sure how far needle is out for WOT and may never use)

Check out the eye chart... I think it has both jet needle to compare size profile ->

http://esvc000237.wic050u.server-web.com/MIKUNIjn.HTM" onclick="window.open(this.href);return false;

[jabcb]

The Alpha Sports online parts manual has Q-0 & 5DP2.
Lists 2nd pilot jet as .7
http://www.alpha-sports.com/suzuki_part ... 350/01.htm

My original printed parts manual doesn't have remarks for the needle jet or jet needle.
Lists 2nd pilot jet as .6

[Vintageman]

Keyster and others get a bad rap sometimes when it’s really the factory documentation that is confusing (still they have reputation for having poor quality control /machining finish at times compared to OEM and no excuse for that).

So 2 to 1 say use Q0 size needle jet with DP2 jet needle. I excluded my opinion from the vote count: already stated previously

0.7 second pilot works better than a 0.6 in both T305 and T350 with chambers IMO. Allows more fuel to flow in that circuit and may only be of value when you want to climb higher into RPMs using mainly just the pilot circuit (i.e. very little throttle applied). Sizing is the same as air jet. That part is obsolete too

[rocc99]

Some really complex stuff at work here, huh? Pretty interesting none the less. I guess I'm going to try the DP2 needle with my current P6 needle jet and see how it shakes out. Hopefully I'll be able to come to some happy medium using the clip adjustment...

Either way, it seems like I'm pretty SOL on the 5DL13 needle...a handful of google searches and browsing the usual suspects hasn't produced anything. Any thoughts on where else I might be able to look?

[tz375]

DP2 is the same at closed throttle to mid range as a DL13 but at the top end (sharp end of teh needle) it is thicker and therefore leaner.

Using a larger needle jet will get the wide throttle openings back in spec but will now be rich at low to mid throttle. If it doesn't fall on its face, that extra fuel should help to keep it cool on the street where we rarely use much more than 1/2 throttle.

[rocc99]

Thanks for the insight...would the larger needle jet be the Q-0? I was able to locate a pair of those for $11.22 each.

http://archwayintl.com/e-store/index.ph ... ts_id=7446" onclick="window.open(this.href);return false;

Was really hoping to reassemble tonight with my new, larger mains and current P6/DP2 combo, but it sounds like you recommend bumping up needle jet size...especially considering that I was running quite lean prior to this...

[tz375]

This was probably covered earlier, but I don't have time to check. What type of needle jet is in there now? Is it a 188? If so just change it to a 159 in whatever size you need, and fit hex main jets of an equivalent flow rate.

If that seller has that jet in stock I will be most surprised. ost vendors say it's out of stock and not available. You could see if they have them and grab a couple

[rocc99]

Currently a 188 P6. The part number I referenced, 09494-00047, should be a 188 Q-0, correct? If so, that vendor does have them in stock.
They have a ton of NOS Suzuki parts...especially really hard to find parts. I've ordered from them multiple times for N/A items and they have always been exact OEM.

[tz375]

If they have them, grab a pair and if they don't, get a pair of #159 series Q-0 which is just a touch richer at low to midrange than the older P-6 and is probably a safer bet.

[Vintageman]

The Q0 oem was a 159 series. The #170 main specificied for stock bike with Q0 is a Hex not Round main: Because 159 is intended for use with Hex main and 188 was intended for round main Mikuni jets. 159 sereis are available from vaious Mikuni suppliers for they are not obsolete.

[rocc99]

Sorry to make things so confusing, but the part number I referenced should be a 188 Q-0, correct? ...which is why they are out of stock everywhere? I just purchased a whole bunch of new mikuni large rounds and if I bought the 159 Q-0 I'd have to get all new hex jets, unless I cross threaded my rounds, which I hear is not the best idea.

I guess my question is...if it were you, would you try the 188 Q-0, or would you forget about the new round mains, buy the 159-Q0 and buy all new hex jets? If the latter, what would be the size equivalents for the following in hex (I assume 4/042 style, yes?):

112.5, 115, 117.5

My stock is set at 112.5, but I am planning on running 117.5 to start due to pods and expansion chambers.

Man, these little buggers add up quick, don't they?

[tz375]

That's easy. I F you can get a 188 series Q-0 to match the Large round main jet selection, that would be the way to go.

Else, go 159 series and large hex in equivalent flow sizes.

[rocc99]

Very good, I'll give the shop a call tomorrow to verify which exact needle jets they are.

Thanks very much for the help...I'd be in a whole lot of trouble without this forum!

[Vintageman]

rocc99

The 159-Q0 series is what came stock on early series 1969 T350 (2 out of 3 dentist recommend) and T305 for 100% sure and they had 170 hex main stock. Hex mains are easy to get too. I would use 170 Hex main if had stock air box... but you want to run pods ...

[tz375]

170 Hex is the same as a 120 Large round. As Vintageman points out, If you have to start buying jets, you might as well go with hex and 159 series, but if you have say 115 through 125 in Large round you will probably be OK.