bogging down

[chase707]

Hello I have a 2005 yamaha blaster and it has been bored over by 48 and when I go to open it up it starts bogging down anyone have any advice of what might cause this. I cleaned the carborator new airfilter and I run 91 octange gas in it I put fresh oil and tranny fluid in it and tried adjusting the carb screw it has me puzzled

 

[Blaaster]

Did you use the same type of air filter?

Was the float level set correctly?

Did you adjust the idle as per specs?

Idle adjusting.

Set float level, make sure that all jets are clean and fuel flows freely from the float bowl drain when the screw is cracked open.

Start with air screw 1.5 turns out.

Set idle screw so that it has some sort of idle. With TORS it is the big screw under seat on top of unit. With no TORS is is the brass screw midway down carb body.

Warm up motor and then set idle screw for a faster idle, 2000rpm+

Adjust air screw either way to get the fastest idle.

Adjust air screw a little at a time leaving 10 secs or until the motor responds.

Re adjust idle screw for desired idle .

 

[chase707]

Did you use the same type of air filter?

Was the float level set correctly?

Did you adjust the idle as per specs?

Idle adjusting.

Set float level, make sure that all jets are clean and fuel flows freely from the float bowl drain when the screw is cracked open.

Start with air screw 1.5 turns out.

Set idle screw so that it has some sort of idle. With TORS it is the big screw under seat on top of unit. With no TORS is is the brass screw midway down carb body.

Warm up motor and then set idle screw for a faster idle, 2000rpm+

Adjust air screw either way to get the fastest idle.

Adjust air screw a little at a time leaving 10 secs or until the motor responds.

Re adjust idle screw for desired idle .[/QUOTE
I will check into it thanks for the tips I hope it works I just bought it a couple months ago and I havent been able to enjoy it completly

 

[chase707]

so I used the same type of filter re adjusted the air and carb screw and cheked my gas flow and still bogging down

 

[tbrooks]

Was the float level set correctly? These things are very picky about the float level and it can get thrown off

 

[chase707]

Was the float level set correctly? These things are very picky about the float level and it can get thrown off

How would you check the float level I bought it bored over

 

[tbrooks]

http://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/

 

[chase707]

http://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/

Thanks gotta check it out tomorrow

 

[bummer981]

How would you check the float level I bought it bored over

Being bored over means nothing.
It has barely increased the size of your engine.

 

[chase707]

Being bored over means nothing.
It has barely increased the size of your engine.

Ok so I took apart the carburetor and the needle came out I have already put it back together and now it seems the first 2 gears are holding back what should I check

 

[chase707]

Hello I have a 2005 yamaha blaster and it has been bored over by 48. I recently adjusted the carburetor and the throttle needle came out and I put it back in and now the first couple gears seems to be holding back what should I check out and how many notches should be the clip for the throttle needle

 

[Blaaster]

Needle should be on the middle clip!

I presume by the previous posts that by now you would have adjusted the float level.

Time to set the idle, then plug chop to confirm the jetting.

 

[chase707]

Thanks for the help yes I have played with the floaters and have adjusted the idle screw and I have the needle set appropriate then . So the jetting how would I check/adjust that?

 

[Blaaster]

You can check the jetting by doing the following.

Before you make the plug chop run it is important that the float level is correct, the idle is set correctly and there are no air leaks in the system, otherwise the smoke ring may lie about the AFR.


WHEN ALL OF THE ABOVE ARE CORRECT PROCEED WITH THE FOLLOWING.


Warm up motor to operating temp.

Fit new B8ES plug, ride WOT through the gears and hold WOT in 5th or 6th gear for 10 seconds, or as long as you can safely.

Switch off the motor and pull in the clutch, apply brakes to come to a stop quickly.

Take the plug out and replace the old one for the ride home.

Carefully cut the threaded end off the plug to expose the insulator.

There should be a smoke ring of a cardboard or biscuit colour around the insulator.

If it is non existant or a very light colour, you are lean and require a larger main jet.

If it is a lot darker you are rich and may go down a size in main.

I prefer to run a little on the darker side, I may loose a little power but it is worth it for the peace of mind that I won't need a rebuild so soon.


You have to get up a reasonable speed so that you can get the motor to pull strongly.


Then hold it Wide Open Throttle (WOT) for 10 secs or as long as you can.


The idea is not to get speed but to make it pull strong at full throttle to get onto the main jet circuit.


I find I can safely do it on a short run by applying the brakes some.


If you have not enough room you can use 4th or 5th gear with good results.

 

[speedyslyder]

what pipe is that on there?
it has to be jetted for that pipe,what size main jet is in there?

 

[chase707]

what pipe is that on there?
it has to be jetted for that pipe,what size main jet is in there?

I dont know its a fmf all way around when I bought it they just bored it up by 48 and had it rejetted so I assume the had the main port enlarged

 

[chase707]

When it is running right it very snappy. But recently the first couple gears seem to be holding back now

 

[speedyslyder]

time to get your hands dirty,check main jet size...fmf should be around 280main..but plug chop to comfirm
do a compression test also
dont worry about the bore/worry aboiut condition of cylinder walls and piston/rings.this 48 you are talking about is soooooo small of a number it is silly lol

 

[Blaaster]

Methinks it is time to remove the float bowl and check the jet size.

Then post up your full mods and advice will be forthcoming.

 

[chase707]

So its a gold series fmf fatty