No acceleration after bike fall By scootro (Read 1,261 times)

[scootro]

After receiving a free TGB 150cc I've spent much time getting running really nicely. The racing CDI really let me scream up steep hills with ease, almost felt too good for a 150.

Anyway after a the bike took a hard fall it's running but simply wont rev high (recently the rev meter died so not sure exactly). It did hit 8000 easily before. I'm guessing it wont go past 4000 now.

It sounds good starts good and even gets to 90km's but slooowly.

I cannot work out what the fall did. Please help me as I need this bike and i mean really need this bike for at least to June.

[justbuggin]

check your intake for cracks and the connections for the airbox to the carb for coming lose sound like you are getting to much air for the feul getting to the motor

[scootro]

Great thank you. think we're onto something here with the fuel intake. one of the bolts were bent and now broken when trying to remove in the intake. Can I replace these two long bolts without opening up the head? Really hope so as i've not been ever able to open the head thanks to damaged nuts.

[Alleyoop]

Check your Variator weights they probably came out of the ramps and are sitting sideways and holding up the revs.
Alleyoop

[Alleyoop]

As for the bent Stud are you talking about the Exhaust studs that hold your Flange for your header pipe and muffler or the INTAKE Studs on top of the head where the Carb Clamps onto?
Alleyoop

[scootro]

Is there a link you could provide to show me what you mean? Because come to think of it the intake manifold was bent when i got the bike but did not seem to affect performance.

I opened the the 'cover' to expose the variator yesterday and belt to look for damage and all looked clean (no obvious damage) but could not see the rollers i've read about before?

[scootro]

Feb 4, 2013 18:56:10 GMT -6 Alleyoop said:

As for the bent Stud are you talking about the Exhaust studs that hold your Flange for your header pipe and muffler or the INTAKE Studs on top of the head where the Carb Clamps onto?
Alleyoop

the intake studs where the carb sends fuel ontop of the head.

thank you sir(s) btw.

[scootro]

Update:

Have located a large crack where the stock air box meets the tube for air into carby. This makes sense as it fell to the left where the box almost certainly took some impact. It's a 28mm CVK carb with a 40mm diameter intake. before going out and getting ripped off to tune of $90 for a k&n filter any advise or tricks waiting for me?

thanks a bunch fellas (from Sydney, Australia btw)

[Alleyoop]

Use JB weld to seal it up that stuff works great, you can drill it sand it paint it.
Alleyoop

[scootro]

well that sounds perfect as been wanting to remove the dodgy choke too. So JB weld ok on the rubbery material? i've read it's good for blocking holes in carbys.

[justbuggin]

use some duct tape to cover the crack if the stud broke off pull the intake of an see if there is alittle bit of the bolt sticking out if so try a pair of vise grip to spin it out ccw

[Alleyoop]

Do not plug up the ENRICHER do this and leave the ENRICHER in. Take the the Whole thing off just two screws and you will see THREE holes make a gasket to cover all three holes and screw the enricher system back on. So if you later decide you want to use the ENRICHER just take the gasket covering the three holes out and WHOLA you again have a working ENRICHER.
Alleyoop

[jct842]

I once used metal out of a coke can, pop rivets, and some silicon to cover a hole in the air intake I cut as an experiment that did not work. It was around 2" in dia. In the end just about any thing can be used to plug her up.

[scootro]

Ok I've cut away the stock air box leaving the curved tubed where i have attached an after market filter. I figured taping up and cracked air box was just too prone to fault again. I'm sure its running a little better but still no acceleration. top speed is good but really slow getting there.

It's as if the throttle wont go above 3/4. Again the carb is clean and needles/jets look perfect to my eye.

notably with the the bike on the stand it revs like anything albeit with a hesitation. apply torque by putting tyres on the road and back to slow sally.

[Alleyoop]

How are you rpms at Wide Open Throttle, Did you ever look at your weights in the Variator?
Put it on the stand and Take the CVT cover off and rev the motor up and watch your variator and clutch see if the belt is moving up and down smoothly.

Or when you twist the throttle the RPMS do not climb fast but slow.

It could be your carb needs to be adjusted to now match the extra air using the Free Flow Filter.

Maybe you can take a video of it on the center stand as you open the throttle so we can hear the motor and see how the belt is climbing up the variator.
Alleyoop