Jump to content

pojan

Montesa dies with full throttle

Recommended Posts

Hi´  

When i turn the throttle very fast to "full" speed, the engine take some RPM, but then it dies, sounds like "drowning" it simple stops if i keep holding the throttle on full. If i loose before it stops, it comes again. I changed the sparkplug, cleaned some electrial parts, and cleaned the air-filter, but it didn´t help.

Any good advice is welcome :-) 

Poja. 

 

 

Share this post


Link to post
Share on other sites
 

 

I'm assuming you have a 4rt.

Why are you turning the throttle very fast to "full" speed?

What happens if you turn the throttle very slowly to "full" speed?

Share this post


Link to post
Share on other sites
 
8 hours ago, pojan said:

Hi´  

When i turn the throttle very fast to "full" speed, the engine take some RPM, but then it dies, sounds like "drowning" it simple stops if i keep holding the throttle on full. If i loose before it stops, it comes again. I changed the sparkplug, cleaned some electrial parts, and cleaned the air-filter, but it didn´t help.

Any good advice is welcome ?

Poja. 

 

 

One possible cause could be that the throttle position sensor thinks your going past 100%.  Try using some superglue to fix a thin washer or something to the stop to see if it will stop doing that, if so its a position sensor issue.

Another possible cause might be that your t-bag filter is plugged, though that seems a bit less likely based on what you indicate is happening. 

  • Like 1

Share this post


Link to post
Share on other sites
 
 
11 hours ago, kurtas said:

I'm assuming you have a 4rt.

Why are you turning the throttle very fast to "full" speed?

What happens if you turn the throttle very slowly to "full" speed?

If i turn it slow, there is no problem (seems) 

Share this post


Link to post
Share on other sites
 
6 hours ago, jonnyc21 said:

One possible cause could be that the throttle position sensor thinks your going past 100%.  Try using some superglue to fix a thin washer or something to the stop to see if it will stop doing that, if so its a position sensor issue.

Another possible cause might be that your t-bag filter is plugged, though that seems a bit less likely based on what you indicate is happening. 

Thanks´i will try, Where do i place that washer, under the gas cable, or ? 

Share this post


Link to post
Share on other sites
 

you need to take the black cover off the throttle body and stick a bit of shim to the casing that the cable pulley wheel would stop against at full throttle.

best of luck

PS think there maybe photos if you search the forum 

Edited by jimmyl
  • Like 1

Share this post


Link to post
Share on other sites
 

Before taking the time to change the TPS stop, what happens if you twist the throttle quickly to high throttle -- maybe 7/8 full throttle? If it does the same thing, I doubt adding a shim for the last 1/32 of opening will make any difference.

Edited by sportsawyer
  • Like 1

Share this post


Link to post
Share on other sites
 

Yes, it'll be tps going to 101% and the ecu says NO. As described above, put something in the stop in the throttle body to limit the travel. 

  • Like 1

Share this post


Link to post
Share on other sites
 
17 hours ago, pojan said:

Thanks´i will try, Where do i place that washer, under the gas cable, or ? 

As jimmyl indicated its under the black cover and add a shim against the casting. 

Share this post


Link to post
Share on other sites
 

Sounds to me like you’re experiencing the four stroke cough, basically every four stroke will die if you wrap the throttle on to full really quickly from idle.

Share this post


Link to post
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...

×
×
  • Create New...