Yamaha RX 100 Carburator Problem???? - xBhp.com : The Global Indian Biking Community

deserteagle · 12-14-2010, 02:17 PM

Hi guys,
I have this Yamaha RX 100 (1996), which i bought few months back. But problems started to develop recently after having serviced it with a local mechanic

. When i bough the bike, it was giving me good mileage of 30+ km/Ltr and the smoke level was normal for an RX. After the day i serviced the bike i road it for an hour or so, crossed 80 once. Suddenly the engine started to die and later i realized the engine was started without checking whether the oil pump is pumping oil in the carb! so i went to another mech and make it sure the oil pump is providing oil to the curb. After that everything seemed fine for a while. But i started to notice the mileage has dropped to 20 km/L and more than usual smoke is coming out of the silencer, and recently fuel is coming out of the carbu's overflow pipe often, when engine is off but the carburatore's fuel key is on

. Some info regarding my bike: spark plug's color closely matches the one with a healthy 2 stork spark plugs, which is brown. Top speed at different gears are as follows: 1st - 20, 2nd - 40, 3rd - 70, 4th - 100+ km/h. Carburatore make is Mikcarb made in India. Piston barrel is a G3. What's there for me to do at this point, i want to change the Carb with the 135's carb. is that OK? and how will i recognize if i'm getting a genuine carb from Yamaha?

Pardon my English guys.

MG · 12-14-2010, 04:15 PM

Topic Approved

deserteagle · 12-14-2010, 04:32 PM

thank you moderator for approving this thread so quickly.

SriramEfunds · 12-14-2010, 05:11 PM

Hello Deserteagle:- I could pressume there could be two issues. First, the carburetor's packing:- float, packing(gasket) etc that is for the fuel leakage. Second, to check if the AF mixture is set correct, that is something you'll need to fiddle with the air screw to get the right position. Though you have mentioned the plug color is brown, however, without seeing the picture of plug would be difficult to assume if it is right.

You can fit the RX135 carburetor on to your bike, however, first go check the above to understand the issue.

Btw, Do you get Mikuni carb from Yamaha showroom there?

There are two variants of carb you get for RX135 - 4 speed and 5 speed.

The OEM Carb assembly for RX135 is Mikuni / UCAL Mikuni. The Carb assembly are different for both 4-Speed & 5-Speed versions.

4-Speed: '4TL 01' with Main Jet = 165 & Pilot Jet = 17.5
5-Speed: '4TL4 20' with Main Jet = 135 & Pilot Jet = 15.0

Note: The type code is mentioned just above the 2-T oil Inlet in the carb, with that the originality can be confirmed. There is already a thread for RX which details all the above mentioned information.

Seniors please share your thoughts.

deserteagle · 12-14-2010, 05:21 PM

thank you SriramEfunds for the suggestions. I'll look into the threads shortly.

deserteagle · 12-14-2010, 06:53 PM

as i know very little of carburatore, and it seems i have to choose between carburatores of two different specifications. so i'm stating my requirements, can anyone suggest me, which variant (4s/5s) will serve my purpose best. what i want is my byke to be able to cruise at 80+km/h speed for a longer duration (e.g. 1-2 hours flat) without being stressed. based upon this which variant will be best for my 4 speed Yamaha rx 100? Later i'll upgrade the bore kit to 135's, but i dont' want to change the gear box to 5 speed. Please advise.

aargee · 12-14-2010, 07:14 PM

You can cruise in 80 Kmph in Rx100 no issues; fix the carbs for now. Take your Rx to a competent mechanic & check the entire carb. The fuel seems to be overflowing through the float, but get that confirmed through a COMPETENT mechanic or Y.A.S.S.

jd666 · 12-14-2010, 08:09 PM

i think the float is cracked on damaged. thats why the fuel is overflowing. had the issue on my bullet carb. A new float and needle fixed it.

SriramEfunds · 12-14-2010, 08:23 PM

Quote:

Originally Posted by deserteagle

Later i'll upgrade the bore kit to 135's

You get RX135 bore kits from Yamaha showroom? I'm curious.

deserteagle · 12-15-2010, 09:22 AM

thanks jd666 and aargee. I also think the culprit is the carb, just last week i cleaned the carb hopping that would improve my situation but it has only made matter worse. I'm thinking of fitting my byke with a RX 135 carb (4 speed).

@SriramEfunds: as I'm from Bangladesh we don't have RX 135 here, i only was able to spot one in the last 7 years. I have to buy it from India. as i know a guy, who runs a motorcycle parts business said he can provide one though it will take some time. I also have to source the carb from India. The only Yamaha dealer available here, charges three times for the same parts and everything!

.

12-14-2010, 02:17 PM	#1 (permalink)
deserteagle Junior Member Join Date: Sep 2010 Location: Dhaka, Bangladesh Posts: 23	Yamaha RX 100 Carburator Problem???? Hi guys, I have this Yamaha RX 100 (1996), which i bought few months back. But problems started to develop recently after having serviced it with a local mechanic . When i bough the bike, it was giving me good mileage of 30+ km/Ltr and the smoke level was normal for an RX. After the day i serviced the bike i road it for an hour or so, crossed 80 once. Suddenly the engine started to die and later i realized the engine was started without checking whether the oil pump is pumping oil in the carb! so i went to another mech and make it sure the oil pump is providing oil to the curb. After that everything seemed fine for a while. But i started to notice the mileage has dropped to 20 km/L and more than usual smoke is coming out of the silencer, and recently fuel is coming out of the carbu's overflow pipe often, when engine is off but the carburatore's fuel key is on. Some info regarding my bike: spark plug's color closely matches the one with a healthy 2 stork spark plugs, which is brown. Top speed at different gears are as follows: 1st - 20, 2nd - 40, 3rd - 70, 4th - 100+ km/h. Carburatore make is Mikcarb made in India. Piston barrel is a G3. What's there for me to do at this point, i want to change the Carb with the 135's carb. is that OK? and how will i recognize if i'm getting a genuine carb from Yamaha? Pardon my English guys. Attached Thumbnails __________________ Destination is an excuse for my being on the road! Ride with patience and respect for others, that just might save you one day.

12-14-2010, 04:15 PM	#2 (permalink)
MG Super Moderator Join Date: Mar 2006 Location: Maharashtra,India Posts: 5,900	Topic Approved __________________ Join xBhp On My photography page: Gourab Das Photography

12-14-2010, 04:32 PM	#3 (permalink)
deserteagle Junior Member Join Date: Sep 2010 Location: Dhaka, Bangladesh Posts: 23	thank you moderator for approving this thread so quickly. __________________ Destination is an excuse for my being on the road! Ride with patience and respect for others, that just might save you one day.

12-14-2010, 05:11 PM	#4 (permalink)
SriramEfunds Senior Member Join Date: Aug 2009 Location: Heart of Chennai Posts: 2,418	Hello Deserteagle:- I could pressume there could be two issues. First, the carburetor's packing:- float, packing(gasket) etc that is for the fuel leakage. Second, to check if the AF mixture is set correct, that is something you'll need to fiddle with the air screw to get the right position. Though you have mentioned the plug color is brown, however, without seeing the picture of plug would be difficult to assume if it is right. You can fit the RX135 carburetor on to your bike, however, first go check the above to understand the issue. Btw, Do you get Mikuni carb from Yamaha showroom there? There are two variants of carb you get for RX135 - 4 speed and 5 speed. The OEM Carb assembly for RX135 is Mikuni / UCAL Mikuni. The Carb assembly are different for both 4-Speed & 5-Speed versions. 4-Speed: '4TL 01' with Main Jet = 165 & Pilot Jet = 17.5 5-Speed: '4TL4 20' with Main Jet = 135 & Pilot Jet = 15.0 Note: The type code is mentioned just above the 2-T oil Inlet in the carb, with that the originality can be confirmed. There is already a thread for RX which details all the above mentioned information. Seniors please share your thoughts. __________________ 'Get your motor runnin, head out on the highway' ZMA-R 2011 \| RX 135 1998 \| RX100 1993 \| Unicorn 2005 - 2011 SOL Helmet Review October 2011 Ooty Ride \| March 2011 - Munnar Tri-state Meet \| October 2010 - Point Calimere \| August 2010 - Horsley Hills \| June 2010 - Yercaud - Tri-State Meet

12-14-2010, 05:21 PM	#5 (permalink)
deserteagle Junior Member Join Date: Sep 2010 Location: Dhaka, Bangladesh Posts: 23	thank you SriramEfunds for the suggestions. I'll look into the threads shortly. __________________ Destination is an excuse for my being on the road! Ride with patience and respect for others, that just might save you one day.

12-14-2010, 06:53 PM	#6 (permalink)
deserteagle Junior Member Join Date: Sep 2010 Location: Dhaka, Bangladesh Posts: 23	as i know very little of carburatore, and it seems i have to choose between carburatores of two different specifications. so i'm stating my requirements, can anyone suggest me, which variant (4s/5s) will serve my purpose best. what i want is my byke to be able to cruise at 80+km/h speed for a longer duration (e.g. 1-2 hours flat) without being stressed. based upon this which variant will be best for my 4 speed Yamaha rx 100? Later i'll upgrade the bore kit to 135's, but i dont' want to change the gear box to 5 speed. Please advise. __________________ Destination is an excuse for my being on the road! Ride with patience and respect for others, that just might save you one day.

12-14-2010, 07:14 PM	#7 (permalink)
aargee My world changed from smoke & 2T to ECM & 4 joke!! Join Date: Jan 2010 Location: Chennai Posts: 8,006	You can cruise in 80 Kmph in Rx100 no issues; fix the carbs for now. Take your Rx to a competent mechanic & check the entire carb. The fuel seems to be overflowing through the float, but get that confirmed through a COMPETENT mechanic or Y.A.S.S. __________________ Patience pays...The Vulture's virtue is patience and the bird always get it's food - Wise man saying This is not a bakery. I don't sugar coat anything. If you ask for my opinion...then that's what you'll get. Don't be mad when it's not what you want to hear

12-14-2010, 08:09 PM	#8 (permalink)
jd666 Senior Member Join Date: Sep 2009 Location: Gurgaon/Faridabad Posts: 3,390	i think the float is cracked on damaged. thats why the fuel is overflowing. had the issue on my bullet carb. A new float and needle fixed it. __________________ My offerings to the gods of speed - - KTM Duke 200 - Yamaha RXZ 5 speed

12-15-2010, 09:22 AM	#10 (permalink)
deserteagle Junior Member Join Date: Sep 2010 Location: Dhaka, Bangladesh Posts: 23	thanks jd666 and aargee. I also think the culprit is the carb, just last week i cleaned the carb hopping that would improve my situation but it has only made matter worse. I'm thinking of fitting my byke with a RX 135 carb (4 speed). @SriramEfunds: as I'm from Bangladesh we don't have RX 135 here, i only was able to spot one in the last 7 years. I have to buy it from India. as i know a guy, who runs a motorcycle parts business said he can provide one though it will take some time. I also have to source the carb from India. The only Yamaha dealer available here, charges three times for the same parts and everything! . __________________ Destination is an excuse for my being on the road! Ride with patience and respect for others, that just might save you one day.

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