tri z Keihin 38 mm carb throttle cable triz 86

[brewy]

Hi All, i have not posted for a while,been busy over the pond here in the uk,started to work on the tri z again just got her a keihin 38mm pwk carb very nice as well,just got a few questions on fitting it,i have noticed on some other threads that pro motion offer a special throttle cable to fit the atc r ,so you dont have to change the thumb throttle is there such an option avaiable for the tri z,Also it is currantly running a 168 main jet, bike is standard apart from boysen reeds and +1 over size just had a full rebuid, any pointers on jet size or any thing else i should be aware of thanks in advance Brewy




fittinghttp://i863.photobucket.com/albums/ab199/brewy_2010/EC6CC17E-7E16-4E06-A5BC-35A8193D797B-1273-0000019CC4D84C2B.jpg (http://s863.photobucket.com/user/brewy_2010/media/EC6CC17E-7E16-4E06-A5BC-35A8193D797B-1273-0000019CC4D84C2B.jpg.html)

[zmpolaristech]

50-52 pilot, 165-170 main, cel needle. PROBLEM IS...if you are still running the fuel pump, you will probably run into flooding issues with this carb at idle, because it is not ment for a fuel pump. it has a large inlet needle to allow gravity to fill the bowl in a reasonable time, but when you hook a fuel pump to it, the pressure will overcome the inlet needle becasue it has a large surface area....causing flooding. I run 39pwks from snowmobiles, cause they are the only PWKs you can buy with a small inlet needle made to be run with a fuel pump. hope this helps, JON

[zmpolaristech]

this thread has lots of good info, read through it, and you'll have a good idea how to fix an issue you haven't had yet.lol.

http://www.3wheelerworld.com/showthread.php/143132-TRI-Z-Fuel-Pumps

[El Camexican]

this thread has lots of good info, read through it, and you'll have a good idea how to fix an issue you haven't had yet.lol.

http://www.3wheelerworld.com/showthread.php/143132-TRI-Z-Fuel-Pumps

I have an update for that thread that may help, or just give you a good laugh.

As posted earlier my fix was to put a smaller hose (1/8”I.D.) between the petcock and the fuel pump to increase resistance to that line and send the fuel back to the tank. Well it worked… for a bit, then I noticed a few drops of fuel one day (Keep in mind I don’t use my trike all that much). So I decided to try and bore out the 3/8” side of the T-fitting and then buy the aluminum unit sold on this site if I failed (it takes a 3/8” hose, but is internally restricted for some reason).

Now before I get to the punch line I need to point out the irony in this story. When I rebuilt my trike I dissembled, rebuilt and replaced EVERYTHING, except for the 3/8” return line to the tank as it has a special bent and I couldn’t figure out a better way to route a new hose, plus it looked to be in great shape, so I used it and never pulled it off the T-fitting during the rebuild.

Ok, so here is where you guys get to laugh your asses off: When I pulled the hose to modify the Tee there was a #168 Keihin main jet screwed into the fitting and then covered by the return hose! Some $%^&(*&^$# must have been having issues with a weak pump and decided that restricting the return line was the fix. I felt so effing stupid when I found this I didn’t post it. However, with this topic back on the board I figure I better confess in case it helps someone else. I still have my restrictor hose in place and don’t have any over fueling issues, but I plan to remove it soon and report back.

PS. What zmpolaristech says about the inlet size is 100% true as verified by a Keihin rep in the States. They don’t make carbs with that orifice size anymore and would need at least a 200 unit order to consider making a run and they can’t be modified.

[brewy]

Thanks for the info Jon much appreciated!,any ideas on the cable set up? do I need to buy another thumb throttle from a another bike to make it work, or is there a cable that will fit the striker and connect to the tri z thumb throttle
Thanks again
Brewy

[brewy]

funny:lol: its always the thing that you think is ok and could not be a problem ends up smacking your ass

[Tri-Zecha]

Just go to Motion Pro's website and spec out a custom cable. I'm sure they'll ship to you. It cost me about $35 and took less than 2 weeks to get fabbed up. It's been working great for me.

[El Camexican]

funny:lol: its always the thing that you think is ok and could not be a problem ends up smacking your ass

Exactly! If you bring every tool and spare part you have to the race nothing ever brakes, but leave a spare part in the garage just one weekend and watch what happens:cry:

[zmpolaristech]

banshee throttle, with a banshee 2into1 throttle cable (for banshees with single PWK carb). The Z thumb throttle won't open the big carb all the way, but the banshee throttle will. Realy, read through that thread....ALL this info is in there.

[brewy]

banshee throttle, with a banshee 2into1 throttle cable (for banshees with single PWK carb). The Z thumb throttle won't open the big carb all the way, but the banshee throttle will. Realy, read through that thread....ALL this info is in there.

ok had a nice enjoyable read there, great thread!! ,mine was leaking fuel today, so just ordered some new fuel line 1/4 i.d,...cant find a single carb banshee through the suppliers I use, they are all listing twin carbs, for the thumb throttle, what year was the single carb model made,got the bit between my teeth now.

[zmpolaristech]

the 2into1 banshee carb system is an aftermarket set-up, but pretty common. Here is a link to a cable on ebay. http://www.ebay.com/itm/YAMAHA-BANSHEE-THUMB-THROTTLE-CABLE-FOR-SINGLE-CARBURETOR-SYSTEM-/300941567014?pt=Motors_ATV_Parts_Accessories&hash=item461183e426&vxp=mtr

[brewy]

the 2into1 banshee carb system is an aftermarket set-up, but pretty common. Here is a link to a cable on ebay. http://www.ebay.com/itm/YAMAHA-BANSHEE-THUMB-THROTTLE-CABLE-FOR-SINGLE-CARBURETOR-SYSTEM-/300941567014?pt=Motors_ATV_Parts_Accessories&hash=item461183e426&vxp=mtr

Just ordered one Jon thanks for your help with it

[brewy]

Hi All ,got the Tri z running today,put the banshee thumb throttle on her with the 2 into 1 cable,changed the fuel lines and bored out the tee on tank return which cured the over fueling problem so big thanks for the advice much appreciated !,the bike ticked over and didn't stall, but on the test run when I was coming into the last 10% of revs it was making the noise but not giving any more speed sounded hollow I'm running the 38mm air striker with a 165 main right now cel needle set in the middle,would I need to adjust the timing to accommodate the bigger carb it's at 1.66 btdc, it's quick up to the point of the last 10-15 % it doesn't bog down ,it keeps revving but the power just doesn't seem to be there in that any ideas any one thanks in advance

[badass350x]

I would jet up on your main!

[3Z with Fangs!]

banshee throttle, with a banshee 2into1 throttle cable (for banshees with single PWK carb). The Z thumb throttle won't open the big carb all the way, but the banshee throttle will. Realy, read through that thread....ALL this info is in there.
For us guys wanting to do it now it's no longer there. Invalid thread.

[El Camexican]

Try this

http://www.3wheelerworld.com/showthread.php/143905-Triz-mod-carb?highlight=polaris+38mm

[3Z with Fangs!]

I meant to thank you for this publicly a few days ago!

[El Camexican]

No problem. What are you planning to use for a manifold with the larger carb?

[6spdls1z28]

I'm curious too.

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[3Z with Fangs!]

No problem. What are you planning to use for a manifold with the larger carb?

Heat the stock one, everyone says it'll work.

[6spdls1z28]

Heat the stock one, everyone says it'll work.That's what I did just wondering if you went a different route.

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[3Z with Fangs!]

That's what I did just wondering if you went a different route.

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I haven't yet because I honestly don't have it all in hand. I ordered the carb, cable, choke pull and the nut and o ring for the bowl because I ordered a sled carb and they're a little different. I'm curious what I'll need to do for Jets but did order through CEL needle recommended in another thread.

[Just-Tri-It]

Is this true for the Keihin 38 Quad Air Striker too or just the Standard Keihin 38 about the pump issue.?.
I was thinking of using the Quad Airstriker.
But if it floods, then I may go a different route.
Thanks

[El Camexican]

Is this true for the Keihin 38 Quad Air Striker too or just the Standard Keihin 38 about the pump issue.?.
I was thinking of using the Quad Airstriker.
But if it floods, then I may go a different route.
Thanks

I had flooding with a PJ and an AS, it’s the orifice size of the float valve that’s the issue, so unless you have a sled carb your going to have to deal with the issue of excessive pressure.

[3Z with Fangs!]

Which is why I chose a sled carb!

[6spdls1z28]

Just drill the t fitting out a little I haven't had a drip out of my 38mm airstriker in like 4 months even went to glamis never had an issue.

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