i went to the cycle shop yesterday to pick up my 128 , guy behind the counter says these carbs suck and i should go with a pumper, i just have the basic mods full sys BG, kn air with the lid on, is this guy trying to make money?

 

Go with the pumper if you have the extra resources to do so. With stock displacement, I would recommend the Mikuni TM33-8012 (pumper) bored out to a 34. Bill Blue, a member of this forum can provide the carb along with mods to the intake flanges to make them fit our bikes. Do a search on his name and you find more info. If you have a big bore, then a TM36-68 might be considered. Some members have reported good success with this carb, but I haven't gotten mine jetted quite right yet.

The pumper will give you much better throttle response over the CV carb.

 

How much are we talking in "extra resources?"

 

dollar to gain in power/response isnt worth it IMO... i have ridden our bike with and without it..... its not worth that much money, id rather spend it on a 300 kit before a pumper.... gotta use this one here...... no replacement for displacement.

 

+10.....no replacement for displacement. Much better than 'more cubes = more herbs'

 

I disagree! If you are a tight woods rider and are looking for instant low end snap not the lag the cv has this is the ticket after the 1/3 of throttle rotation then both carbs are pretty close.

 

Everything that's been said so far is correct. You need to sit down and plan out all of the mods you want to do to your bike before you plunk down any cash. You also need to determine what your budget is. If you want to keep your bike at 250cc's, then go ahead and get a TM33 pumper now. If you want to do any kind of big-bore, get that kit first. Also, decide how much of a big-bore you want. A TM33 pumper would work great for 250-300cc's. Some guys have evenreported good results with a TM33 /331 kit combo. On my 340, I was running out of carb with the TM33, so I went with a TM36. Both the TM33-8012 and the TM36-68 can be had for around $300, give or take.

All that being said, the stock carb can be jetted to workwith any of these combinations. I'm just of the mindset that if you're going to spend the time and money to get the most out of your bike, then goall the way.The throttle response and the extra low-end snap of a pumper carb is worth the price of admission, in my opinion.

 

I have a KLX 300 with an FCR 35 andIMO it has been the one of the best mods, along with suspension, that I have done. The instantaneous hit you get with a pumper completely changes the manner of the bike, for the better whenriding off road.I can twist the throttle and know it's going to react. I would definitely spend the money againon anFCR for the type of riding that I do. However, If I was mostlycruising around on the streetor non technical off road riding like fire roads etc. I would probably stay withthejetted stock CVK.

 

I think AgoosSS summed it up very well, What type of riding do you do loudoo76?

 

basicly i ride the road till we get to the trails we are getting too, but the guys i ride with 4 of them have 650s, klrs and drz so trail riding stock was fine