I have no bottom end power!

Y

YamahaGirl42

New Member
Apr 6, 2012
6
0
1
Indiana
So here's my problem; I just recently bought a 2001 Blaster from a friend of mine who hasn't had it that long himself. I have installed a carb. rebuild kit, new plug, air filter was fairly new and new reeds. I had a small leak in the carb. but since the rebuild kit was installed that has ceased. My problem is I have NO bottom end what so ever! :( I have to really pump the throttle and feather the clutch to get it to take off. If I don't keep the RPM's high when attempting to do so, I bog out an it dies, especially if I'm upward on a hill, there's no way I'm getting up it. It does however run GREAT on top end! When the air screw is at stock settings of 1.5, it won't run. It only runs if it's at a 1/2 turn or 3/4. Any suggestions? Am I not getting enough compression? Do I need an entire overhaul? Bad carb? Any help or idea's would be absolutely appreciative :)
 
First off, WELCOME!

Now, did you clean your carb out really well? Could be some crude stuck in you pilot jet.

What mods are done to this bike?
 
did u install a new different sized carb if so it could be that. larger diamater carbs will take bottem end power and give abit top end. the stock carb is still very good to run. if all thats good u may be low on compression. is the rebuild kit for the topend or carb?
 
Wow, you guys are fast! :) Yes, I do believe I cleaned it out pretty well, but I will def. go though it again this evening and check to see if I did well enough. And pay special attn to the pilot jet (I believe I cleaned that quite well though). The bike is entirely stock also. (but not for long!:) I really want to do a lot to it in the future.

And no, the new carb. rebuild I put in it was OEM(stock). And it's for the carb, not the top end. My dad suggested that it may be low on compression which is why I asked also, but also that it could just be the carb. Any help on diagnosing I will try.
 
If you cleaned out the carb really well then that might not be your problem. I agree that checking compression is a good place to start.
 
If your running a stock pipe with that setup, then that's most likely your issue. Stock pipes are restrictive for anything over a stock engine setup. Those reeds, carb, and air filter increases the "flow", and you'll need to upgrade your exhaust in order to compensate that. I think an FMF Fatty pipe will fit your engine perfectly.
 
Make sure you get all the little holes in the side of the pilot jet cleaned out. I use the metal wire in the middle of a bread tie to ream the holes clean.
 
Ok, I will check the compression on it this weekend. Blasterdemon, I like the idea of using the bread tie wire, that I can take care of this evening! An I don't think it would be the exhaust pipe unless I was using an aftermarket cab. an performance reeds? Everything is stock. Do you really think? I was talking with a guy I work with today also and he told me to take the air box out and run it, or to take the air filter out and see what kind of flow I have. He tunes his motorcycle that way he said. Good idea or no? Any suggestions is good, I'm learning here :)
 
YamahaGirl42 said:
It does however run GREAT on top end! When the air screw is at stock settings of 1.5, it won't run. It only runs if it's at a 1/2 turn or 3/4. Any suggestions? Am I not getting enough compression? Do I need an entire overhaul? Bad carb? Any help or idea's would be absolutely appreciative :)
Click to expand...

Might be an air leak, if you need to turn your air screw in so much to get it to run right. I would do a leakdown test and then try to trouble shoot carb problems.
 
YamahaGirl42 said:
I was talking with a guy I work with today also and he told me to take the air box out and run it, or to take the air filter out and see what kind of flow I have. He tunes his motorcycle that way he said. Good idea or no? Any suggestions is good, I'm learning here :)
Click to expand...

This guy knows nothing about two strokes, he must be a Piano tuner, you take the lid off to get at the tuning pegs.

If you take the filter or tamper with the air flow by removing the air box, you are gonna run way too lean.

Do a Compression test.

I see no mention of you doing a leakdown test, might pay to do one.
 
it is common practise to remove the airbox lid, however you have to compensate by putting a bigger main jet in.

Your problem sounds very much like a pilot jet issue. Check it again. I would also strongly recommend a leak test and a compression test be done to see where you are at. when doing a comp test, remember to keep the throttle wide open.
 
Blaner said:
it is common practise to remove the airbox lid, however you have to compensate by putting a bigger main jet in.
Click to expand...

Thanks for picking me up on that Bro, removing the air box lid and jetting to compensate, is a great way to extract more power.

I was mainly responding to the comment, "take the air filter out and see what kind of flow I have. He tunes his motorcycle that way he said".

It was my lame attempt at humor to brighten up my day!
 
Blaaster said:
It was my lame attempt at humor to brighten up my day!
Click to expand...

here i'll help ya with that................

sir-mix-alot says red beans and rice will give girls tons of "bottom end" !!!!I:I

but seriously, these guys are on it....
clean carb, pilot circut and jet again, thoroughly with carb cleaner and blow out with compressed air all passages and jets

was the brass washer re-installed under the main jet ?

check your reeds for chips/cracks and laying flat on the cage.
try a new plug, even new plugs can foul instantly

inspect inside the plug boot and the wire itself, and your black ground wire at the coil for good connection, electrical problems sometimes seem like jetting problems

check that compression and get back to us

are you getting good fuel flow from the tank, pull the fuel line and check it into a cup
did you check/set the float level while in the carb ?
check it while your in there again, it should be 20-21.5mm, measured like this

4785-float-height.jpg


heres my full troubleshooting rundown .............

http://www.blasterforum.com/engine-13/my-general-troubleshooting-maintenance-30347/
 
Late to the party so what can I add ????? :-[ 8-|

Oh ya, Welcome to BF !! I:I

Did you remove pilot jet and air screw when you cleaned it? Air filter clean?

As to tuning it has to be just as it will be ran. Lid/no lid, stock, uni, K&N filter, outer wares or no.

You can tune a piano, but you can't tuna fish :D I:I
 
You must log in or register to reply here.

Similar threads

Dragonslayer
Blaster idles, but revs up slowly in neutral and has no power in gear
Replies
1
Views
214
Engine
Dragonslayer
Dragonslayer
C
Stick to 240s BigBore
Replies
0
Views
158
Engine
chasejleveck
C
95f150
Top end rebuild advice
Replies
0
Views
175
Engine
95f150
95f150
lightwylin19
05 blaster has no power at all
Replies
1
Views
113
Engine
YZ Otis
YZ Otis
C
Are my cases still good?
Replies
0
Views
77
Engine
Chaotic
C
Top Bottom
Back