Jump to content

Lean Gasgas 280


deanogasgas
 Share

Recommended Posts

Hi all.

         280 gassa 2011 clunk noise with a quick hand full of throttle, spoke to a few people at the trials and the overall was the bike is running lean / engine clunk...The fuel screw is 3.5 turns out, the bike idles sweet & runs very well.

Could anyone point me in the right direction- Main jet / pilot jet correct setting or factory settings, or how to get rid of the light clunk...

Thanks Deano.

Link to comment
Share on other sites

 

 
 

Standard if think is 118 main, 36 pilot. Sounds more a low end knock, so maybe try your mixture screw out a half or full turn (dellorto mixture screws control fuel). And maybe check your needle clip. I think running a 38 pilot is relatively common

 

Its gonna run richer in the summer, so id maybe give the carb a good clean before playing with jets. A drop of water in the floatbowl can block the pilot somewhat and make them run weak.

Edited by faussy
  • Like 1
Link to comment
Share on other sites

 
 
 
 

" with a quick hand full of throttle"?

What are you doing? Sitting there wacking it off? Do you ride that way?

Lean throttle chop ping(knock) may be caused because you just shut off the fuel to a revving motor!

The pilot(low speed) jet is the one that helps here, providing you are using good fuel of proper octane.

36/38 or possibly even 40 is not out of the question. Finding the sweet spot while maintaining good running is the key, and you will likely have to come way off the 3.5 turn thing and down into the 2-3 turn range with the larger jet installed.

  • Like 1
Link to comment
Share on other sites

 

" with a quick hand full of throttle"?

What are you doing? Sitting there wacking it off? Do you ride that way?

Lean throttle chop ping(knock) may be caused because you just shut off the fuel to a revving motor!

The pilot(low speed) jet is the one that helps here, providing you are using good fuel of proper octane.

36/38 or possibly even 40 is not out of the question. Finding the sweet spot while maintaining good running is the key, and you will likely have to come way off the 3.5 turn thing and down into the 2-3 turn range with the larger jet installed.

 

Agree with all of this. 

Link to comment
Share on other sites

 

OK, Lost my back brake on the last two sections of the last trial. bled it got it back and there is a very slight, mind very slight weep out of the gap in the reservoir cap.

Brake is very good and I did get a few air bubbles out, could this just be over-fill ?

OH, stripping car tomorrow so will let you all know the both jet sizes.

Thanks Deano.

Link to comment
Share on other sites

 
 
 
 

Hi Guys Deano here,

                                  Main jet = 120

                                  Pilot jet = 35

Just moved the needle up onto its last notch...OH by the way found out why I have no back brake :angry: hose has cracked right at the banjo going into the reservoir.. looks like I need a new complete hose, any ideas where to go for this thanks Deano.

Link to comment
Share on other sites

 
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...