084/880 Fixed Jet

[jmester]

Does any one know if part number 1124 121 5604 fixed jet 1.04 is press in or threaded. I want to put it in a ht5 that's has a press in fixed jet that is going to go on my 880. The ht 5 has a .94 fixed jet that maybe enough jet for an 880. I would think the morefuel the better.

 

[Definitive Dave]

@Jimmy in NC

 

[jmester]

I think based on some internet searching and pictures that tillotson switched from a press in fixed jet to a screw in fixed jet. There maybe a bigger press in fixed jet but tillotsons part description are about worthless to try and figure anything out.

 

[drf256]

Can you just drill it and sneak up to the tune you want?

 

[Moparmyway]

Jets: (not all are available in all countries)
.46 = 1121 121 5601
.52 = 1121 121 5602
.56 = 1120 121 5600
.61 = 1123 121 5601
.62 = 1122 121 5603
.64 = 1122 121 5604
.66 = 1128 121 5605
.68 = 1128 121 5603
.70 = 1128 121 5602
.72 = 1122 121 5602
.74 = 1122 121 5607
.76 = 1128 121 5604
.88 = 1124 121 5609
1.04 = 1124 121 5604

Carburetors with fully adjustable fuel mixture screws:
044/046/MS440/MS460 = 1128 120 0624 with .70 jet
064/066/MS650/MS660 = 1122 120 0621 with .64 jet

Dual port muffler covers:
044/046/MS440/MS460 = 1128 140 0801
064/066/MS650/MS660 = 1122 140 0800

Does any one know if part number 1124 121 5604 fixed jet 1.04 is press in or threaded. I want to put it in a ht5 that's has a press in fixed jet that is going to go on my 880. The ht 5 has a .94 fixed jet that maybe enough jet for an 880. I would think the morefuel the better.

Looks like they're threaded, but I'm guessing
@Mastermind ??

 

[jmester]

Can you just drill it and sneak up to the tune you want?

I was just thinking about that last night. That maybe what has to be done.

 

[Jimmy in NC]

Does any one know if part number 1124 121 5604 fixed jet 1.04 is press in or threaded. I want to put it in a ht5 that's has a press in fixed jet that is going to go on my 880. The ht 5 has a .94 fixed jet that maybe enough jet for an 880. I would think the morefuel the better.

Let me get to my IPL and notes today. The 088 carb [Tilly] is a screw in jet. I put an 088 carb and intake on an 880. I ground the floor out of the intake leaving timing alone. It got a 361 coil. Opened the stainless muffler up. With a stock 1.04mm jet it is pig rich and miserable. Swapped to a 1.0mm high altitude and its still rich but better. High side 1/8 out.

If you 880 is otherwise stock or close to it..be weary of changing to a bigger jet as it may not net you what you want.

 

[Mastermind]

Looks like they're threaded, but I'm guessing
@Mastermind ??

Yes sir.

 

[jmester]

Ok thanks for the help. Found out from Tillotson that .94 is the biggest for a ht5. They also told me that with a press in jet you can usually only change them once before they leak around the bore of the jet. I went ahead and ordered a HT 12 because you have more flexibility with set sizes.

 

[Moparmyway]

Great timing with this ................. where did you source the HT12 from ?

 

[blsnelling]

Are you not able to tune it with the jet that's in it?

 

[jmester]

I am getting the HT 12 from @fordf150 . They are pretty expensive. I have not tried the carb out yet. I got it years ago as a spare for for my 084. I want to use it now on my 880 . I have found that the jets installed from the factory are not always the best. Sometimes you need to go bigger and sometimes smaller.

 

[jmester]

Also got some more information on the jets available for the ht-12 or any HT carb with screw in jet. Tillotson has jets that range from 0.50mm to 1.07mm. I got part numbers from 0.90 to 1.00.

Jet Size. Number.



0.90mm 49-B26

0.92mm 49-B27

0.94mm 49-B28

0.96mm 49-B29

0.98mm 49-B30

1.00mm 49-B31

These go up in steps of 0.02.

 

[Moparmyway]

I am getting the HT 12 from @fordf150 . They are pretty expensive. I have not tried the carb out yet. I got it years ago as a spare for for my 084. I want to use it now on my 880 . I have found that the jets installed from the factory are not always the best. Sometimes you need to go bigger and sometimes smaller.

I got my HT-12 from M&D, $183.00 delivered

 

[Definitive Dave]

https://www.ebay.com/itm/323730473695
148.39 shipped
more in stock late this week

https://www.ebay.com/itm/323899479402
1.00 jet

 

[Jimmy in NC]

Also got some more information on the jets available for the ht-12 or any HT carb with screw in jet. Tillotson has jets that range from 0.50mm to 1.07mm. I got part numbers from 0.90 to 1.00.

Jet Size. Number.



0.90mm 49-B26

0.92mm 49-B27

0.94mm 49-B28

0.96mm 49-B29

0.98mm 49-B30

1.00mm 49-B31

These go up in steps of 0.02.

Part numbers are only half the battle. Its damn near impossible to order them. I would take an 0.96 if I could get one. 1.04 was huge... 1.00 starting to be able to tune the high but still fat...1/8 turn out is where it is set.

 

[Moparmyway]

https://www.ebay.com/itm/323730473695
148.39 shipped
more in stock late this week

https://www.ebay.com/itm/323899479402
1.00 jet

I should have asked you a few months ago !!

 

[jmester]

I am going to order some tomorrow. I will grab a .96 for you if they can be had. My guess it is just like everything else you will have to wait for it a month or 2.

 

[jmester]

Got some jets coming. Got 2 -.96 and 1 of .98 and 1 1.00. should be here in about 2 weeks from Tillotson. @Jimmy in NC got you one.

 

[jmester]

Tillotson came through. I would have to say they are very willing to help. Jets are here.