Comet GT250 OwnerShip Thread.

[vijith.unnithan]

Go tthe Sparks replaced and the front pads... teh bike is better but still feel the engine coughing up at 7-8k RPM.. going to get the carb checked as i feel taht is teh culprit. will keep posted...

@Push.. i have done 140+ with Pillion months back .. but now it struggles to touch 100.. not sure why .. as said by Mach.. getting the list of things checked...

[maverhick]

Go tthe Sparks replaced and the front pads... teh bike is better but still feel the engine coughing up at 7-8k RPM.. going to get the carb checked as i feel taht is teh culprit. will keep posted...

@Push.. i have done 140+ with Pillion months back .. but now it struggles to touch 100.. not sure why .. as said by Mach.. getting the list of things checked...

Coughing up or dropping power completely? If its dropping power then its a CDI issue. Coughing up, dont know

[vijith.unnithan]

Coughing up or dropping power completely? If its dropping power then its a CDI issue. Coughing up, dont know

hahah.. i really don know how to explain this better but when i start the bike and raise the accelerator to 7k RPM, the bike kinda drops down in power struggling to go further and then i have to change the gear... again the same happens in each gear...

[maverhick]

hahah.. i really don know how to explain this better but when i start the bike and raise the accelerator to 7k RPM, the bike kinda drops down in power struggling to go further and then i have to change the gear... again the same happens in each gear...

Yep, thats the CDI issue. There is no known solution except replacing the CDI unit.

[vijith.unnithan]

Yep, thats the CDI issue. There is no known solution except replacing the CDI unit.

oh that doesnt sound good. i will check with my mech to see if he can do anything.. could it be a electrical wiring issue

[maverhick]

I hope he can, I have had to change 2 CDI units over 3 years just for this one issue. if you want more info, check a forum called alternative cruisers, this issue is fairly well documented there including a cable patch solution that might just work.

oh that doesnt sound good. i will check with my mech to see if he can do anything.. could it be a electrical wiring issue

[Brat]

Guys, i need some help sourcing aftermarket parts, i understand that you mostly rely on online sources to ship in aftermarket/OEM parts? Can anyone who's had good/reliable experiences with such PM me with your recommendations?

[vijith.unnithan]

I hope he can, I have had to change 2 CDI units over 3 years just for this one issue. if you want more info, check a forum called alternative cruisers, this issue is fairly well documented there including a cable patch solution that might just work.

Thanks, mav.. checking the forum now

[vijith.unnithan]

Guys, i need some help sourcing aftermarket parts, i understand that you mostly rely on online sources to ship in aftermarket/OEM parts? Can anyone who's had good/reliable experiences with such PM me with your recommendations?

sent you a PM

[MACH50]

There is no known solution except replacing the CDI unit.

Hiccups in upper power band do not mean, that it has to be a CDI related issue,a problematic CDI won't start up the engine at all, since every charge from battery goes to the motor via this box.

I would stick to my check list, from a real experience of this kind of problem from carbed bikes.

@Vijith.unnithan:If the spark plugs is making it better, it means that the engine is suffering from loss of compression at high rpms and it requiring a lot of spark power to make a small difference.

Next check is definitely the carburettor and a fuel tank flush out and wash.

The Carburettor should be checked for Main Jet clogging and over all cleaning.
The water drainage pipe of the fuel tank should be flushed out and tank internals should be checked for possible rust debris and sand.

I already have mentioned a change to the ignition cable which delivers charge to the spark plugs.

Trust me, this kind of hiccup-ish problem is hardly present on FI bikes.

even my comet won't go above 125, as in, it goes smooth till 125, but it just dies after that, going for a service this monday, lets see if it gets resolved

This would be a decaying CDI issue, coz it is possible that the cdi is providing too much of a resistance to free flow of charge to spark plug at high rpms, when it is edging close to the limiter.

Also I would recommend to go for synthetic engine oil on ur bike and have a check if the piston rings have worn out or not.

The Comet version of GT250 bikes is highly capable, I have seen and want to share with u people the kind of performance it can impart from videos documented in other countries like Brazil:

http://www.youtube.com/watch?v=lk1pQoBgUbQ&feature=related

[vijith.unnithan]

Hiccups in upper power band do not mean, that it has to be a CDI related issue,a problematic CDI won't start up the engine at all, since every charge from battery goes to the motor via this box.

I would stick to my check list, from a real experience of this kind of problem from carbed bikes.

@Vijith.unnithan:If the spark plugs is making it better, it means that the engine is suffering from loss of compression at high rpms and it requiring a lot of spark power to make a small difference.

Next check is definitely the carburettor and a fuel tank flush out and wash.

The Carburettor should be checked for Main Jet clogging and over all cleaning.
The water drainage pipe of the fuel tank should be flushed out and tank internals should be checked for possible rust debris and sand.

I already have mentioned a change to the ignition cable which delivers charge to the spark plugs.

Trust me, this kind of hiccup-ish problem is hardly present on FI bikes.

Thanks, Mach... i hav ethat in my list already.. going tomorrow to get teh carb cleaned and the fuel tank flushed..

[pushprajpradhan]

@Mach, thanks for a valuable reply bro, i have been using Mobil 1 Oil (have mentioned this few pages back, when i had my bike redone)

and yes, i have seen those vids on youtube and bookmarked them, and all of that speed on just stock bike, man i want to do that baby

[MACH50]

@Mach, thanks for a valuable reply bro, i have been using Mobil 1 Oil (have mentioned this few pages back, when i had my bike redone)

If possible, try for once using Motul 300V.

[pushprajpradhan]

will do it next time when the oil change is due.

[vijith.unnithan]

@ mach/ all....


Me back again... i finally got teh bike serviced.. the carb was taken off to the last part cleaned and fit back.. oil change.. sparks replaced.. but the bike still is in the same state.. the bike wont go past 80kmph and chokes.. with a pillion it wont go beyond 60 and the worst part it just chokes bad on inclined roads.. the bike was at its best 2 months back and now i am really running out of options of why the bike is struggling...

the mech told that the issue is to do with the burning of the spark plugs.. i am not sure what he meant but he told me that the problem will be fixed in another 2000km with oil changes at 1000km.. is this true... i really would need any advise here that will help.. the bike used to run at 140-150kmph but now.. it wont even cross 80kmph ...

The one thing i noticed when the mech removed the card was rust particles from the tank.. i told him to do the flush which he did but he told there is nothign much we can do to avoid the rust since its an old bike... any advise on how we can avoid rust deposits... also as MACH mentioned, this could be an issue with teh ignition cable.. but i just want to be sure if there is anything else i should do befor ei replace teh ignition cables.

Please advise....