pojan Posted February 20, 2020 Report Share Posted February 20, 2020 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. Quote Link to comment Share on other sites More sharing options...
misscrabstick Posted February 20, 2020 Report Share Posted February 20, 2020 Clean out the carburettor jets. Make sure a good supply of fuel is reaching the carburettor. Quote Link to comment Share on other sites More sharing options...
kurtas Posted February 20, 2020 Report Share Posted February 20, 2020 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? Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted February 21, 2020 Report Share Posted February 21, 2020 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. 1 Quote Link to comment Share on other sites More sharing options...
jimmyl Posted February 21, 2020 Report Share Posted February 21, 2020 Sounds like the throttle stop. quick fix as described above Quote Link to comment Share on other sites More sharing options...
pojan Posted February 21, 2020 Author Report Share Posted February 21, 2020 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) Quote Link to comment Share on other sites More sharing options...
pojan Posted February 21, 2020 Author Report Share Posted February 21, 2020 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 ? Quote Link to comment Share on other sites More sharing options...
jimmyl Posted February 21, 2020 Report Share Posted February 21, 2020 (edited) 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 February 21, 2020 by jimmyl 1 Quote Link to comment Share on other sites More sharing options...
sportsawyer Posted February 21, 2020 Report Share Posted February 21, 2020 (edited) 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 February 21, 2020 by sportsawyer 1 Quote Link to comment Share on other sites More sharing options...
mattv6 Posted February 21, 2020 Report Share Posted February 21, 2020 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. 1 Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted February 22, 2020 Report Share Posted February 22, 2020 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. Quote Link to comment Share on other sites More sharing options...
kurtas Posted February 22, 2020 Report Share Posted February 22, 2020 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. Quote Link to comment Share on other sites More sharing options...
jrsunt Posted February 22, 2020 Report Share Posted February 22, 2020 The Mont doesn't, it picks up quicker than a well set up carb on a 2 stroke!! 2 Quote Link to comment Share on other sites More sharing options...
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