Just swapped engines, was a bitch to get going once everything was hooked up. Exup valve cycles properly. ended up spraying isopropyl alcohol straight down the air intake to get it fire up, warmed it up with revs and rides ok up the street and back. Clutch and gearbox way better than the other engine. All four are firing BUT i can't get it to idle. Screwing the idle screw either way does nothing, starting very easily now that it's warm but once you back off the throttle it's dead. Are these screws easy to snap? Maybe mines broken. Which way should bring the idle UP? I thought it was anti clockwise? I've tried both NOTHING cheers
Have you cleaned the carbs? The pilot jets could be fouled, and are difficult to clean. Have you synced the carbs? Have you set the idle mix screws?
Also check for air leaks around the carby boots. If they suck air between the carbs and the head they don't idle.
Noticed the exup cable didn't full a rotation this morning, Loosened it off and it's good now. Started straight up with the choke on and idles, but doesn't want to idle with no choke. The idle screw isn't snapped, it's completely out of the carby. Guess I'll find out where to screw it back in shortly and hopefully fixes it.
Got another problem. with my previous engine I only got a few hundred K's out of it until I had problems. The carby was completely cleaned and rebuilt. So that should rule that out. I dropped a cylinder and it was coming good sometimes and then going bad again... had low compression on that cylinder. Thought I could unjam the valve if it was that, but it just got worse. This engine has All 4 cylinders going and I got it idling. No trouble starting it since the minor tune up. Took her for a ride, was going fairly well, but felt a little gutless pulling up a majorly steep hill but I just dropped back and kept the throttle open, wasn't TOO bad though. All of a sudden lots more little hills, started dying majorly... like I was lucky to get up them, but if I got it over 10,000rpm BAM felt awesome. Didn't give it a hard time though... Then it started breaking down, a guy in 4x4 through a very busy area pulled out in front of me when I was coasting through a 50 zone making me have to slow right down and I failed to take off again, Bike wouldn't idle, pulled to kerb and bike wouldn't start, pulled over and waited a while, tried and tried again ..no idle. kept trying and had to rev it up majorly to like 10,000RPM to take off after a few failed attempts. Kind of embarrassing with everyone around. This happened a few times AND it started blowing smoke all of a sudden. Kept riding and pulled over again to check it out... it's idling again. Thought OK that problems over... (new fuel filter too) The bike was very warm by now and I was fairly pissed off. Just spent a lot of time doing a complete engine swap and there were 2 minor things I wasn't told about the engine. Cylinder 2 had 1 snapped exhaust thread and right side of engine head (cylinder 4) where the engine has 2 bolts to mount to the frame, 1 was stripped. This DOESN'T really affect anything BUT Anyway I thought hell... I'm going to redline it. I redlined it and it was perfect. No hesitation at all, felt awesome. Then all of a sudden it felt 100x more powerful in every gear down in the low rev range and had no trouble accelerating up hills without having to drop back gears like crazy... I thought HELL YEA! Got the cobwebs out!!! It felt like a new engine all of a sudden. On the way back home a couple of other riders popped out in front of me, so I started riding fairly hard to catch up to them and stay with them. The bike felt so alive and I was pretty much stoked... I figured it may take a little riding to kind of 'run it back in'. I topped it up with fuel on the way through, BP Ultimate 98 octane. The stuff I usually use. So I'm on my way home, and I thought HELL YEAH this feels good.. a decent running engine.. I'll keep riding... went straight past my street which leads down a massive hill. BIKE DIES. Tacho just drops to nil. No response with throttle, obviously it's a hills so I tried to use the momentum I had to roll start it. Major electrical fail? Walked back home.. dammmm I went down to where i parked it just before, it's been there for at least 4 hours. No response. Guessing there's no spark. Any advice? This is 2 engines now... I don't get why they are going good, then bad, then good, then bad!!! I've spent 750 on a mechanic all up The bike was 900 Roadworthy Registration It's adding up and I'm getting frustrated!!! I'd be well into the 2500 mark now with the new engine, oil, filters etc It is no longer a 'cheap 1st bike' <!-- m --><a class="postlink" href="http://fzr250.com/viewtopic.php?f=2&t=3645">http://fzr250.com/viewtopic.php?f=2&t=3645</a><!-- m --> Found that post there, unfortunately came to an end with no resolution but that's what started happening to me basically until complete failure.
Just confirm that it not a battery issue - try starting and if it does not go, then try jump starting of a car battery (in a running car) If it starts then your battery is weak or flat. If that is the case then check the charging circuit <!-- l --><a class="postlink-local" href="http://fzr250.com/viewtopic.php?f=30&t=3420#p25777">viewtopic.php?f=30&t=3420#p25777</a><!-- l -->
it started running perfect just before it died. It cranks over no issues, battery seems fine. I am about to take it apart again and check with multimeter. It's started off a roll start when the battery was too weak to crank the engine previously. I'm sure it's the coil or CDI How do I diagnose which part of the electrical system it is if it's not the battery? 110 bucks worth of fines for breaking down in an 8 hour parking zone~!
the guy who sold me the motor is sending me a pickup coil, coils AND CDI unit for 50 bucks delivered. Not too bad when I see CDI units going for 80 - 160 + postage <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s -->
well it ended up being the pick up coil.. or whatever is in that casing that says 'yamaha' on it. I just unscrewed this one and put the one off the old motor on, 4 screws & spark... the other CDI and coil done nothing so ended up being what was probably least likely to be. bitch to get started but once it was warm... was idling, accelerating properly, pulling up hills, had a good ride <!-- s --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s --> goes insane once you're over 10k! <!-- s:Biker1: --><img src="{SMILIES_PATH}/th_Biker_1.gif" alt=":Biker1:" title="biker_1" /><!-- s:Biker1: -->
Glad you've got it running! You still need to check your EXUP - you should not have such a noticeable step in power at 10k. There are lots of reasons for hard starting, and the EXUP is one of them.
