[Discussion] Carburetor

[Au5h]

Yo peeps.

 

I'm facing this problem recently; my bike (version S) can start and engine will rev as per normal. Then about 1 min later or so, the engine gradually dies down and stall. As if it ran out of petrol. So since then, I pull throttle when it's dying down, or use the choke to start and let the engine continue running.

 

Last time, I was able to start engine without the choke, even if the engine was cold (for instance, one week of not warming up my bike).

 

I suspect it's the caburetor, which needs tuning, I think. But is it possible that the air filter could be the issue?

 

Carburretor service is ex man. Especially when there are parts that needs replacement.

[thrasher]

Ver s? I think its abt time for major servicing already? Thus u need to spend more. Like the saying goes, u pay peanuts u get monkeys

[MonsterJufri]

Guys.. izit true that spec 3 main jets theres 2 different size in carb..its like 2 jets 0.5 and another 2 1.0???

[MonsterJufri]

bro, u serious? so how about the riding style?

 

if u play pick up, it will suck more. if u open vtec it will suck more..throttle control is important if u wanna get the best FC.

my spec 3 hits 400km too.

[warrior.c.o.n.p]

mine was 320km. i prefer shell 98 or twice a mth i go for vpower. nvr had a cab service or tuning since i bought the bike. 5 1/2 yrs & still counting

[rowdy_rahz]

CB400 superfour version s carburetor fix on Superfour VTEC 1?

[singkiwi]

Hi All,

 

What are the options we have for Carbs. i have a 1998 SuperFour CB400F3V, I am going to be fitting pod filters and exhaust, I know I need to rejet but what are the options for differents carbs?

 

I have been able to find

MIKUNI TMR-MJN32 (Yoshimura website)

MIKUNI TMR32 (Yoshimura website)

I also understand we can use GSXR400 carbs, any ideas which ones?

 

do anyone advise which is the best way to go?

 

Cheers

[Metal_Heart]

It's possible but don't do that. VTEC 1 has vtec. Has an extra hose if im not wrong. Ver S carbs doesnt have this.

[singkiwi]

I got a GSXR400 carb today, supposedly it'll give me more horse power but they're a real dog to keep tuned. I've also got a problem that there's 5mm difference in the diameter so I either need to modify the carb or the rubbers?

[samson]

hi guys do u noe roughly how much to change the diaphragm inside the carburetor cost?

[SparkerS1]

I got a GSXR400 carb today, supposedly it'll give me more horse power but they're a real dog to keep tuned. I've also got a problem that there's 5mm difference in the diameter so I either need to modify the carb or the rubbers?

 

i am not sure of a gsxr400 carb but based on ur problem, u might have to modify the air intake manifold

[shazwanmchaggis]

hello people.

 

anybody knows how often i needa service my carb and change the EO, coolant and etc.?

 

TY.

[holdurhead]

hello people.

 

anybody knows how often i needa service my carb and change the EO, coolant and etc.?

 

TY.

 

Once every 3 months

[holdurhead]

hello people.

 

anybody knows how often i needa service my carb and change the EO, coolant and etc.?

 

TY.

 

Once every 3 months

[jokerdefar]

hello people.

 

anybody knows how often i needa service my carb and change the EO, coolant and etc.?

 

TY.

 

I ride a spec 3... Recommended service for carb(provided the carb does not out of sync) and coolant(of cox if empty need to top up la) only once yearly. EO change once every 5000KM or 3 months which ever come 1st.

[Dino Bravo]

Whats the milage per litre of gas you guys are getting for a spec 2?

Edited July 1, 2012 by Dino Bravo

[Dino Bravo]

Im using 105 for main jet.

Is that the stock size?

Edited July 4, 2012 by Dino Bravo

[exwhyzee]

anyone got any idea wat is the stock size for the needles, pins and the main jets?

[thrasher]

If u go the previous pages, you'll get the answer

[exwhyzee]

well i did read all 3 pages of this thread b4 posting my qn as i only found the following posts which comes closest to the ans im seeking for or did i miss sumting out?

in the end replaced 4 needle and 2 main jet things. not sure what are they. 1 of the needle is already br[MENTION][/MENTION]oken. and apparently previous owner changed them before. 2 needle was "35" and the other 2 was "38". the mechanic changed all 4 needles to "38". and the 2 main jet was changed from "102" to "105". Also replaced some torn o-rings, and did a cleaning and tuning of carb. Total cost $230

 

i think its normal for 2 needle - "35" and the other 2 - "38". mine are of those sizes too.

Guys.. izit true that spec 3 main jets theres 2 different size in carb..its like 2 jets 0.5 and another 2 1.0???

none of the figures above was confirmed as stock sizes so hence my qn

[micheal84]

u serious? the fuel consumption drops?

[syeDsTp]

Guys, my spec1 has mini backfires when engine braking. Is it good? And when my bike almost hits reserve, it will lose power at a certain point of time. Meaning to say that when i pull the throttle, its as though like u off the engine while moving and even the exhaust sound change. Any idea whats the prob?

 

 

 

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[byon]

Guys, my spec1 has mini backfires when engine braking. Is it good? And when my bike almost hits reserve, it will lose power at a certain point of time. Meaning to say that when i pull the throttle, its as though like u off the engine while moving and even the exhaust sound change. Any idea whats the prob?

 

 

send it to your workshop good heaven.

check your exhaust headers! quickly weld the hole or change the exhaust round ring gaskets! it's fine to hear the sound as i've been riding with it for the longest time until i welded it back one month back.

[syeDsTp]

I dont think theres a hole bcoz all the problems arises when my petrol is on reserve bro..

 

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[LXY]

Guys, my spec1 has mini backfires when engine braking. Is it good? And when my bike almost hits reserve, it will lose power at a certain point of time. Meaning to say that when i pull the throttle, its as though like u off the engine while moving and even the exhaust sound change. Any idea whats the prob?

 

 

Sent from my GT-N7000 using Tapatalk

 

backfire might be due to air/fuel ratio incorrect..