May 10, 201511 yr 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??
May 10, 201511 yr Author 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
May 10, 201511 yr Author 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, 201511 yr by cjallison
May 10, 201511 yr 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.
May 10, 201511 yr Author Cheers turbo ,and dadof2, ive got a mate with one ill swap it over and see how it goes Edited May 10, 201511 yr by cjallison
May 10, 201511 yr 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.
May 10, 201511 yr 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.
May 11, 201511 yr 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.
January 11, 20251 yr Hi did this issue ever get sorted as I have this problem exactly the same today ran sweet all day then started like this
January 13, 20251 yr You need to give more info. You have a 2024 or a hammered 20 year old bike. Is the 4rt new to you. What actually happened!
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