Author Topic: 3xv carbs  (Read 406 times)

Ivor2Stroke

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3xv carbs
« on: January 30, 2018, 07:51:59 PM »
hi,just rebuilt tzr with new seals,bearings and pistons fully standard bike but it doesnt run great on bottom cylinder the one with the silly carb,would it need re-jetting or is it some other problem,thanks

mellorp

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Re: 3xv carbs
« Reply #1 on: January 30, 2018, 08:15:59 PM »
Have you got the correct float bowl on ? Front cylinder has the Power Jet blanked off IIRC
Mellion say If it ain't broke thrash it until it breaks

Ivor2Stroke

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Re: 3xv carbs
« Reply #2 on: January 30, 2018, 08:26:44 PM »
whats the difference with the bowls?
i think both of my carbs have a blank in the pilot jet

yanw

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Re: 3xv carbs
« Reply #3 on: January 30, 2018, 09:43:55 PM »
Warwick and others were mentioning there are passageways in the float bowl that get blocked up and need cleaning out and gives poor running which reminds me of a job I have to do soon.....

Ivor2Stroke

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Re: 3xv carbs
« Reply #4 on: February 01, 2018, 12:20:32 AM »
do i need to blank the pilot jets off,thanks

mellorp

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Re: 3xv carbs
« Reply #5 on: February 01, 2018, 01:44:32 AM »
Are you confusing power jets with pilot jets
Mellion say If it ain't broke thrash it until it breaks

peterbike

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Re: 3xv carbs
« Reply #6 on: February 01, 2018, 10:37:32 AM »
is your bike an R ?     If so , the feed to power jets in the bowl is blocked off . leave it that way.
 you need your pilot jets - pull them out check for blockage . it is a tiny hole, too small for a sewing needle to pass thru.
 are your pilots a 15 ?
air screws set ?
what revs are your problem ?

Ivor2Stroke

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Re: 3xv carbs
« Reply #7 on: February 09, 2018, 12:08:46 AM »
well the bikes been on the dyno ran like crap

15hp to start was juddering under acceleration,took filters out upto 30hp still juddering,couldnt pinpoint wat was wrong,said maybe electrical?
wat you guys think

ybk

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Re: 3xv carbs
« Reply #8 on: February 09, 2018, 12:15:12 AM »
Probably still your carbs. How did it run before the rebuild? The carbs have to be spot on, ie, even slight blockages will cause bad running. Post up some pics of the carbs as you disassemble them, maybe we can spot something out of place.

A bath in an ultrasonic cleaner can help as well.

mellorp

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Re: 3xv carbs
« Reply #9 on: February 09, 2018, 07:33:13 AM »

A bath in an ultrasonic cleaner can help as well.

Personal hygiene is very important
Mellion say If it ain't broke thrash it until it breaks

ybk

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Re: 3xv carbs
« Reply #10 on: February 09, 2018, 09:33:28 AM »
 Haha a 3xv knows when its owner is dirty and will run like crap until said owner takes a bath  ;D C:-)

Warwick

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Re: 3xv carbs
« Reply #11 on: February 10, 2018, 11:57:09 AM »
Are you confident that the problem is with the carbs? What I mean is: was the motor running fine before you rebuilt it? If so, what else might you have disturbed or changed while the bike/motor was in bits?

Have you checked for basic ignition faults too - plugs, plug caps, coils, LT wiring etc.?

The poor running could ultimately be caused by many things, so you'll probably just have to work through components and systems systematically eliminating possible causes as you go to find the root cause. Which will probably turn out to be something so simple that it will be among the last things you actually get round to testing...  :-[ ;D   
« Last Edit: February 10, 2018, 03:22:06 PM by Warwick »
Still Smoking...

Ivor2Stroke

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Re: 3xv carbs
« Reply #12 on: April 14, 2018, 02:36:11 PM »
hi folks i tried a few things cans where blocked,swapped for cleaner ones and changed fuel tap to rgv one,messed with air jets now runs a bit better but still judders when opening to full throttle if you ease off to 3/4 seems to run ok any more ideas would be appreciated,thanks

ybk

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Re: 3xv carbs
« Reply #13 on: April 14, 2018, 11:04:17 PM »
Needle position maybe? I would drop the needle a notch?

Theres a stock carb internals table in the resources section, confirm that all the carb internals are what they should be, mains, emulsion, pilot etc