So I brought myself a '00 ZZR-250 last week and it feels like a cylinder is dropping in and out after about 10 minutes at cruising speed (100 ish km/h at about 7,500 - 8,000 rpm). It feels fine when I'm sitting around 80 km/h (roughly 6,500 rpm)
Check your plugs and see if they are fouling up with fuel. My cbr was doing the exact same thing while holding speed, it turned out to be a carb balance issue. 1 butterfly valve stayed closed while the others were open at low throttle and that made the plug of that cylinder foul constantly. Hope this gives you some ideas
What sort of filter (if any) is in the fuel line? What happens at that speed if you open the throttle more, does it die or pick up revs? What happens if you pull the choke on, does it go better or die? Is the vent in the tank clear?
Idk if it has an in line filter, I can't see much behind the fairings. If I twist the throttle more it picks up again. I haven't tried riding with the choke on. I'm assuming the fuel tank vent line is clear because I've done over 200km with this problem. I'm going take the bike to the mechanic asap to get the carbys balanced and new spark plugs put in
The problem is that if you take it along asking for the carbys to be balanced and new plugs fitted.. that is all they will do and you could well have the same issue... depending on the mechanic. Ideally you take it along and tell them the problem and have them fault find it for you if you are unable or unwilling to do it. Where are you?
Idk if it has an in line filter, I can't see much behind the fairings. Take the fairings off ?? If I twist the throttle more it picks up again. I haven't tried riding with the choke on. Then try it with the choke on?? I'm assuming the fuel tank vent line is clear because I've done over 200km with this problem. That makes no sense at all I'm going take the bike to the mechanic asap to get the carbys balanced and new spark plugs put in ... and that will acheive what?? Theres no use asking for advice here if your arnt willing or cant even take the fairings off to help locate a problem ... we cant obviously fix your bike over the interwebs but if you are just going to ignore whats posted and just take it to a mechanic as a solution straight up then whats the point of asking here? ..... theres people here that could take apart and rebuild your entire bike with their eyes closed .... and if you follow their advice and guidance you may find the same skills over time. Mechanics and old bikes ... good luck with that.
Look mate. It's not that I don't want to try to fix my bikes myself, it's more that I just don't have the time. And I don't have my car licence (still need about 50 hours). Most days , I'm out looking for some sort of a job, and I don't usually get home until after dark My bikes are my only source of transportation, so if I make an irreversible mistake while in the process of trying to fix my bikes, I'll have no way to get anywhere. I currently live about half an hour away from the nearest motorbike mechanic that I trust. And money has never been a thing that I have ever had much of, so I want to get it all fixed on the first try. So please don't try to accuse me of being lazy and not willing to do anything to at least try to fix my bikes.
I'm asking here because I can't find anything anywhere about the issues that I've been having. I spend a good hour at least every night going through these forums and Facebook and any other websites that I can find to try to find an answer so I can tell the mechanic what to do and how to fix the issue
Jeez you are in the boonies lol. The issue is, as I said before. If you ask a mechanic to do X that is what they will do, even if it isn’t what is needed. If you are going to take it to him, tell him what it is doing and tell him to let you know before he does much work. It doesn’t sound like a balance issue and it is doubtful it is plugs. It is more likely the carbides need cleaning setting which is so much more than just balancing. Sent from my iPhone using Tapatalk Pro
You should really check the plugs they will tell you whats going on inside the cylinders. Sounds like a carby balance problem. Check my post from when i had my issues. It sounds like youre having the same drama https://2fiftycc.com/index.php?thre...tting-plugs-cbr250rr.10467/page-2#post-122859
The mechanic said fuel is pooling on the top of the engine because a couple of fittings for the carbs are trucked. They've ordered some new parts. So now I'm waiting on a call saying that my bike is ready to go
Just got my bike back 2 days ago. The mechanic said that a fuel line connector had split, causing a slow fuel leak all over the top of the engine. They had to order the part directly from Japan. The mechanic said that I was lucky that they could still get the part. Hence the 3 week wait.
