cjallison Posted May 10, 2015 Report Share Posted May 10, 2015 my 4rt has started " bogging down" when you go for a big handfull of throttle it bogs down ,if i back it off for a split second it picks up and revs fine , if i go steady on the throttle it picks up revs as normal ,but if i open it up and keep it pinned the revs die and will eventually stall ive cleaned out all the usual bits - air filter fuel filter, anyone got any ideas?? Quote Link to comment Share on other sites More sharing options...
lineaway Posted May 10, 2015 Report Share Posted May 10, 2015 Do you have the proper idle set in the first place? Quote Link to comment Share on other sites More sharing options...
cjallison Posted May 10, 2015 Author Report Share Posted May 10, 2015 Been fine up to a run out on tuesday (observing at ssdt) very wet , but bike was fine nothing been altered or messed with . Then on wednesday noticed the problem Quote Link to comment Share on other sites More sharing options...
cjallison Posted May 10, 2015 Author Report Share Posted May 10, 2015 (edited) Also i did 8 miles on the road on tuesday getting back to the van after observing but again the bike was fine running sweet as a nut ,i didnt nail it on the road just nice and steady Edited May 10, 2015 by cjallison Quote Link to comment Share on other sites More sharing options...
turbo Posted May 10, 2015 Report Share Posted May 10, 2015 Mine did this and it turned out to be the throttle body knackered . Quote Link to comment Share on other sites More sharing options...
dadof2 Posted May 10, 2015 Report Share Posted May 10, 2015 My advice is not RT specific, it is just the first things I would look at on an EFI car with these symptoms. Check any fuel filters and fuel pump delivery pressure Check for water or dirt in fuel It could be the potentiometer track on the throttle position sensor. This is incorporated within the throttle body on the 4RT. Suggest you borrow a known good throttle body or have yours checked out by someone with Honda EFI diagnostics kit. I do knot know if the potentiometer outputs are accessible for checking with an oscilloscope or meter. Quote Link to comment Share on other sites More sharing options...
cjallison Posted May 10, 2015 Author Report Share Posted May 10, 2015 (edited) Cheers turbo ,and dadof2, ive got a mate with one ill swap it over and see how it goes Edited May 10, 2015 by cjallison Quote Link to comment Share on other sites More sharing options...
lineaway Posted May 10, 2015 Report Share Posted May 10, 2015 Having a bike to swap parts is the easiest by far on the 4rt`s. We have 4 bikes at work and two complete spare bikes to keep them up. Check all your connections and grease. But once it all dries out it might clear up any way. Quote Link to comment Share on other sites More sharing options...
the addict Posted May 10, 2015 Report Share Posted May 10, 2015 Change the plug, sorted. 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted May 10, 2015 Report Share Posted May 10, 2015 That`s funny, just last week one 4RT would not start. It still had the original plug in it. Ten years old, just had a small metallic feather. 1 Quote Link to comment Share on other sites More sharing options...
mattv6 Posted May 11, 2015 Report Share Posted May 11, 2015 I had this on one of my 4rt's, the only problem I have had in 9 years of 4rt ownership. Turned out to be the throttle position sensor...basically it will read up to 99% but when you go to 100% the sensor will loose its signal and the engien dies. because it looses its signal it will cut off the fuel. when you back it off a fraction it picked up again. You could try another throttle body...or maybe try and insert a stop inside the cover where the throttle cable goes in to stop it at 99% so it cant go to the point off the sensor where it looses it reading. Quote Link to comment Share on other sites More sharing options...
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