|
|
Post by jjwalsh on Apr 13, 2020 20:51:59 GMT 1
Hi All, Ive had my 1982,unmolested, RD350 LC 4lo since 1987.... Wheeled it into the garage in 2001 where it stayed untill 2016 when i set about recommissioning it.Work done as follows
Complete new crank fitted...new genuine Yamaha crank seals..rebored...new pistons and piston rings...4lo01 carbs completely stripped down,ultrasoniced and blown clear with air compressor....brass balls removed and jetted clear... new 220 mains...new 22.5 pilots...new float needles...new emulsion tubes....new reeds...carbs balanced..needle at middle clip and air screw at 1.5 turns out. Timing is at 1.8mm BTDC.
Checked Stator resistance and its 89 for pulse coil,232 for low speed windings and 5.5 for high speed windings...no leakage to ground.
I had been having problems with fouled/wet plugs every 20/30 miles.. It would initally run on two cylinders but after 6/7 miles it would stop running on one side,usually the right side. When i recently fitted the new emulsion tubes the plugs now have good tan/normal colour. Cant check if its running properly on both cylinders because of below....
Heres my problem/s.... tried to take it for a spin...doesnt want to pull away in 1st or 2nd gears...had to get up to 3500/4000 rpms in order to move off...any less and she stalls....it feels like fuel starvation but then i was thinking it could be the stator but ive read on the forum that some feel theres a typo in the Haynes Yamaha stats for the low windings...
Any help would be more than welcome as im pulling out the little hair i have left in my head.....
|
|
|
|
Post by shaunthe2nd on Apr 13, 2020 21:13:47 GMT 1
Sounds like you have set your carbs up per normal settings.
A few things to think about:
-what plugs are you running? ideally B8ES and need to be genuine (lots of copies out there)
-did you buy the pilot jets (and main) from a reliable source? Ideally genuine Mikuni type
-have you tried other settings on air screw, and maybe needle position to see if improves?
-is the carb cross tube fitted nice and snug.
-did you de-coke the exhausts
It could be lots of things, including electrical.
You didn't say if the bike runs ok once you get it revving?
|
|
|
|
Post by LC_BOTT on Apr 13, 2020 21:27:55 GMT 1
Sounds like you've checked, but what float height did you set them to, as I think there's a discrepancy in the haynes manual?
|
|
|
|
Post by 4l04ever on Apr 13, 2020 21:41:25 GMT 1
Fuel starvation could be caused by filler cap breather not working. Check fuel flow from both tap outlets are okay.
|
|
|
|
Post by jjwalsh on Apr 14, 2020 0:48:19 GMT 1
Sounds like you have set your carbs up per normal settings. A few things to think about: -what plugs are you running? ideally B8ES and need to be genuine (lots of copies out there) -did you buy the pilot jets (and main) from a reliable source? Ideally genuine Mikuni type -have you tried other settings on air screw, and maybe needle position to see if improves? -is the carb cross tube fitted nice and snug. -did you de-coke the exhausts It could be lots of things, including electrical. You didn't say if the bike runs ok once you get it revving? Running NGKB8ES plugs pilots and mains along with emulsion tube are from Yambits...{but still have original ones....their probably ok..might but them back in to see what happens }. New carb cross over pipe fitted, nice and tight.. Exhausts de-coked... I havent played around too much with air screw or needle positions yet....probably the easier thing to try over the next few days. Will take it for a spin to see how it drives in the higher rev range and post... Thanks for the feedback |
|
|
|
Post by jjwalsh on Apr 14, 2020 0:53:06 GMT 1
Sounds like you've checked, but what float height did you set them to, as I think there's a discrepancy in the haynes manual? Thats interesting.....i went with whats in the Haynes manual....do you have a link or do you know what it should be,Tks |
|
|
|
Post by jjwalsh on Apr 14, 2020 1:00:02 GMT 1
Fuel starvation could be caused by filler cap breather not working. Check fuel flow from both tap outlets are okay. I think the breather is built into the key hole of the lockable filler cap....no hissing or suction noise when cap is opened.....fuel coming out of both pipes when cap is locked, Tks for replying.... |
|
|
|
Post by midlifecrisisrd on Apr 14, 2020 8:09:09 GMT 1
Choke link pipe fitted between carbs?
If Yambits supplied carb parts hopefully they ain't keyster as they are crap
Steve
|
|
|
|
Post by rigga on Apr 14, 2020 8:45:26 GMT 1
Struggling pulling away is normally blocked pilots, but you say you've cleaned all the Carb out ....take the yambits pilots out and fit cleaned originals, and give that a whirl.
|
|
|
|
Post by shaunthe2nd on Apr 14, 2020 9:18:17 GMT 1
Sounds like you have set your carbs up per normal settings. A few things to think about: -what plugs are you running? ideally B8ES and need to be genuine (lots of copies out there) -did you buy the pilot jets (and main) from a reliable source? Ideally genuine Mikuni type -have you tried other settings on air screw, and maybe needle position to see if improves? -is the carb cross tube fitted nice and snug. -did you de-coke the exhausts It could be lots of things, including electrical. You didn't say if the bike runs ok once you get it revving? Running NGKB8ES plugs pilots and mains along with emulsion tube are from Yambits...{but still have original ones....their probably ok..might but them back in to see what happens }. New carb cross over pipe fitted, nice and tight.. Exhausts de-coked... I havent played around too much with air screw or needle positions yet....probably the easier thing to try over the next few days. Will take it for a spin to see how it drives in the higher rev range and post... Thanks for the feedback Before you open the carbs up, try a few different settings on air screw as you can do that easily and see if that helps. Start at say 1/2 turn out to 2.5 turns out in half increments and make a note how it runs at each setting. I agree with what has been said above if this doesn't improve it, switch out the pilots for the originals and see what happens. |
|
|
|
Post by muttsnuts on Apr 14, 2020 10:17:12 GMT 1
which carbs are fitted ? - you have 3 possible options, 4L0-00 unmodified, 4L0-00 modified, 4L0-01 need to know that before you do anything
|
|
|
|
Post by shaunthe2nd on Apr 14, 2020 16:04:44 GMT 1
which carbs are fitted ? - you have 3 possible options, 4L0-00 unmodified, 4L0-00 modified, 4L0-01 need to know that before you do anything Dave he indicates 4L0-01 in first message so seems to be the later type. |
|
|
|
Post by jjwalsh on Apr 14, 2020 18:17:01 GMT 1
Thanks lads,i didnt get a chance to do anything today but i will over the next few days...ive taken all comments onboard and will work through them... will post results...
|
|
|
|
Post by muttsnuts on Apr 14, 2020 19:53:54 GMT 1
which carbs are fitted ? - you have 3 possible options, 4L0-00 unmodified, 4L0-00 modified, 4L0-01 need to know that before you do anything Dave he indicates 4L0-01 in first message so seems to be the later type. haha, old age catching me up, didn't see that buried in the text, no that then, unless they have been restamped, seen that a good few times ! |
|
|
|
Post by jjwalsh on Apr 18, 2020 23:11:54 GMT 1
Running NGKB8ES plugs pilots and mains along with emulsion tube are from Yambits...{but still have original ones....their probably ok..might but them back in to see what happens }. New carb cross over pipe fitted, nice and tight.. Exhausts de-coked... I havent played around too much with air screw or needle positions yet....probably the easier thing to try over the next few days. Will take it for a spin to see how it drives in the higher rev range and post... Thanks for the feedback Before you open the carbs up, try a few different settings on air screw as you can do that easily and see if that helps. Start at say 1/2 turn out to 2.5 turns out in half increments and make a note how it runs at each setting. I agree with what has been said above if this doesn't improve it, switch out the pilots for the originals and see what happens. |
|
|
|
Post by jjwalsh on Apr 18, 2020 23:38:56 GMT 1
Hi All,
Heres the update,
A. I left the Yambits carb parts in place.. Started with air screws out half a turn from closed...needle clip in position 3 { mid way } Pulling away from static was slightly better...From 2.5/3000 rpms upwards to 5000/55000 she was running lovely,crisp and responsive....reluctant to push further as im still running her in. Did 10 mile run and tempature dial third way up the green section...took sparplugs out and all looked good.
B. Yambits carb parts still in place.Turned air screws out another half a turn { one full turn out from closed }..needle still in position 3...Pulling away seemed similar to A. above....over 2500/3000rpms upwards to 5000/55000 running same as above with temp dial and spark plugs same...Did 10 mile run
C. Yambits carb parts still in place.. Left air screws at one full turn out from closed but raised the needle one notch { lowered clip to position 4 from top } Instant result... pulling as you would expect from 1500rpms....no stalling or having to slip clutch...running brilliant up to 5000/5500....will push it further when properly run in...Did same 10 mile route
Im very happy as it stands now...might move air screws out another half turn and see what happens....
Many thanks to all who commented and advised....i really appreceiate it...hope my hair can start to grow back now
JJ
|
|
|
|
Post by shaunthe2nd on Apr 19, 2020 10:09:03 GMT 1
Good news. Sometimes the minor tweaks make some difference. Glad you have got it running well.
|
|
|
|
Post by muttsnuts on Apr 19, 2020 11:28:37 GMT 1
yambits air screws are shorter than original Yamaha ones, so they need to be in further than normal, the taper is all wrong as well, that is why you have had to lift the needle, to compensate for all of the extra air that is going in
the fix is go up on the pilot by one, and set your needle correctly, but if your happy with it, then leave well alone
|
|
|
|
Post by stusco on Apr 19, 2020 11:34:11 GMT 1
If your like the rest of us it won’t grow back 🤠unless you have Elton John money
|
|
|
|
Post by jjwalsh on Apr 22, 2020 21:01:22 GMT 1
🤔... no offence to Elton but maybe ill stay bald.....Thanks again to all....a wealth of information readily available...much appreciated.
|
|
|
|
Post by veg on Apr 22, 2020 21:15:03 GMT 1
If your like the rest of us it won’t grow back 🤠unless you have Elton John money He just wears wigs. Me I do arse hair reverse comb over 🤙 |
|
