LTD B engine upgrade

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01 Jan 2010 12:28 #341507 by davel
Replied by davel on topic LTD B engine upgrade
texaskz1000 wrote:

I think I did 1 full turn on mixture screws and i have the 110's still in bag.


Go down to 1/4 turn on the mixture screws. 115 main jets will get you close on the main circuit.

Needles are very easy to adjust on the RS carbs. Just remove the slide cover, loosen the small allen screw holding the retaining finger and rotate it out of the way. Use a needle nose pliers to remove the needle and adjust the clip position. All 4 needles can be adjusted in a few minutes.

With some minor carb adjustments you should be able to get good throttle response and power with no carbon fouling.

Let us know what happens.

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01 Jan 2010 12:39 #341509 by saxjonz
Replied by saxjonz on topic LTD B engine upgrade
APE Jay wrote:

Put a 1075 kit and cams in it and you will be glad you have those carbs.

I have to second that notion as well because you will really like it especially if you do some nice porting and polishing. Make sure you add a cooler to that mix. My bike runs hot in traffic and I am looking for an oil cooler to put on it to keep the temps down.

79 LTD B3
80 LTD B4 1075 kit JE Pistons .410 cam grind, Bassani, 31 keihin CR Specials...
1980 Z1R, 2002 ZRX1200, 2003 ZRX1200

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  • texaskz1000
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02 Jan 2010 09:51 #341575 by texaskz1000
Replied by texaskz1000 on topic LTD B engine upgrade
What should stock compression be? Mines is showing 220 on each cyclinder but 3 show 225.

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02 Jan 2010 11:29 #341588 by mark1122
Replied by mark1122 on topic LTD B engine upgrade
texaskz1000 wrote:

What should stock compression be? Mines is showing 220 on each cyclinder but 3 show 225.

220psi indicates some 10.25:1 pistons.B)

76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)

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02 Jan 2010 11:37 #341589 by mark1122
Replied by mark1122 on topic LTD B engine upgrade
texaskz1000 wrote:

So I did and the bike ran ok but keeps running through pluggs and now got a brand new set of Mikunis that i can't return because i used them.

I like the throttle response of the 34's. I tried a buddys 29mm and she was kind tame.

I think your answer is staring u in the face.
U like the way the carbs perform ,but they fowl plugs.
Follow davels advice.
once u get them tuned properly they will not fowl plugs.
u are obviously rich on the pilot s.
Learn how to tune them befor u buy new carbs. you will have to tune new ones anyways.
Read all u can an tune away. when your done u will have saved enough for a header, then u can tune it again. lol
Have fun with it. there is lots of help here. probably the worst question u can ask on this forum is, what size carbs. there are many dif opinions here.:silly:

76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)

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21 Jan 2010 16:11 #343777 by texaskz1000
Replied by texaskz1000 on topic LTD B engine upgrade
Ok thanks everyone for your help.

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21 Jan 2010 17:07 #343786 by Old Man Rock
Replied by Old Man Rock on topic LTD B engine upgrade
Whoa.... am I getting this right where the recommendation is for him to re-build his whole engine just so he can use these carbs! :blink: :silly: :woohoo:

1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter

Phoenix, Az

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21 Jan 2010 17:29 #343793 by kawsakiman
Replied by kawsakiman on topic LTD B engine upgrade
it seems like that hu?

you can go bigger or smaller on jets to achieve what you are looking for.

follow the advice already given by davel

someday i will be able to afford my kz habit.

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21 Jan 2010 17:31 #343794 by will61310
Replied by will61310 on topic LTD B engine upgrade
But he really Likes them...:) Sounds like the motor is already somewhat built @ 10,25 compression.

...1980 LTD 1000...

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