trevbul1 Posted December 8, 2022 Report Share Posted December 8, 2022 2007 standard 4RT 250 was running fine but first, suddenly would cut out when the throttle was touched and now won't start at all. Checked the air fllter, plug, fuel feed from tank (fresh 99 fuel); the plug is wet and it has a spark; doesn't make sense that it won't run. No changes made to idle speed, always used to start on a dead throttle and throttle is fully closed. Any thoughts please? I can't find anybody local with a diagnostic tool that won't charge me about as much as the bike is worth and reading the manual on diagnostics is gobbledegook to me, I barely understand one word in three... Bring back carbs and points! Any thoughts gratefully received, cheers. Quote Link to comment Share on other sites More sharing options...
lineaway Posted December 8, 2022 Report Share Posted December 8, 2022 How long have you owned it? Quote Link to comment Share on other sites More sharing options...
jrsunt Posted December 8, 2022 Report Share Posted December 8, 2022 Make sure the throttle cable isn’t snagged anywhere and properly seated. Fuel pump wire under the tank connected? The little grey pipe that connects to the injector hasn’t come off? Can you get hold of another throttle body to try on your bike? 1 Quote Link to comment Share on other sites More sharing options...
trevbul1 Posted December 8, 2022 Author Report Share Posted December 8, 2022 1 hour ago, lineaway said: How long have you owned it? Only had it 5 months. looked v clean when we bought it (suspension, brakes etc excellent), not so great under the tank we discovered, lots of dust and grime on the wiring Quote Link to comment Share on other sites More sharing options...
trevbul1 Posted December 8, 2022 Author Report Share Posted December 8, 2022 14 minutes ago, jrsunt said: Make sure the throttle cable isn’t snagged anywhere and properly seated. Fuel pump wire under the tank connected? The little grey pipe that connects to the injector hasn’t come off? Can you get hold of another throttle body to try on your bike? Cable OK, no snags and throttle fully closing. wires reconnected after flushing tank with fresh 99 grade fuel. regret we don't know any other owners Quote Link to comment Share on other sites More sharing options...
lineaway Posted December 9, 2022 Report Share Posted December 9, 2022 Do a reset first. Hold throttle all the way open, without releasing kick it twice. Close throttle and start the bike. No throttle and let it run for a whole minute before you twist the throttle. If that does not work adjust the throttle body one full turn counter clockwise. Try again, no throttle. Good Luck. 1 Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted December 9, 2022 Report Share Posted December 9, 2022 FYI the Idle setting on the 4RT's are quite high 1800 + or - 100 and can be affected by altitude so even if you haven't adjusted it you may still find it is needed. Quote Link to comment Share on other sites More sharing options...
on it Posted December 9, 2022 Report Share Posted December 9, 2022 10 hours ago, lineaway said: Do a reset first. Hold throttle all the way open, without releasing kick it twice. Close throttle and start the bike. No throttle and let it run for a whole minute before you twist the throttle. If that does not work adjust the throttle body one full turn counter clockwise. Try again, no throttle. Good Luck. reset what ? throttle open no fuel = need free play in cable, so all your doing is clearing the bore out with air so hardly a reset is it as, ive been on them 12 yr and have not found what it resets please tell me Quote Link to comment Share on other sites More sharing options...
Cookiemonster Posted December 9, 2022 Report Share Posted December 9, 2022 Resets the ECU when mines been running a few hours & is difficult to restart you follow the above procedure & bingo Quote Link to comment Share on other sites More sharing options...
on it Posted December 9, 2022 Report Share Posted December 9, 2022 (edited) 17 minutes ago, Cookiemonster said: Resets the ECU when mines been running a few hours & is difficult to restart you follow the above procedure & bingo i ask again resets what in the ecu ? as i say all that is doing is clearing out the bore of fuel and air mix Edited December 9, 2022 by on it add Quote Link to comment Share on other sites More sharing options...
Cookiemonster Posted December 9, 2022 Report Share Posted December 9, 2022 Someone more technically gifted than me may be able to help all I know is it works for me Quote Link to comment Share on other sites More sharing options...
lineaway Posted December 9, 2022 Report Share Posted December 9, 2022 Yep, the 4rt is very picky if you start it and just ride off cold before the ECU does its thing. It does not happen often, but it sure sucks in the middle of a section. Quote Link to comment Share on other sites More sharing options...
jrsunt Posted December 9, 2022 Report Share Posted December 9, 2022 As jonnyc says, could be as simple as the idle been too low.They won’t start or even attempt too if too low. I think it’s anti-clockwise to increase (someone will correct me if it’s clockwise) 2 Quote Link to comment Share on other sites More sharing options...
yzee 48 Posted December 9, 2022 Report Share Posted December 9, 2022 Mines the same, when hot if you hold the throttle wide open then push kickstart slowly 3 times, then close throttle kick over & fires into life, I bought mine used, the man I bought it of had it from new, he told me this procedure & it works. Quote Link to comment Share on other sites More sharing options...
lineaway Posted December 9, 2022 Report Share Posted December 9, 2022 There is alot of things that has gone wrong with an older 4rt as alot of parts. Start with the simple and work ghrough it. I thought thefe was a thread on the TPS. Also disconnect the kill switch and also a thread on the angle bank sensor. The list goes on and on. Quote Link to comment Share on other sites More sharing options...
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