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Post subject: Spluttering 350lc
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Gillybobs  Suburban Commuter Joined: 25 Oct 2007 Total posts: 60 Location: Sheffield,South Yorkshire |
Having problems with my 350 lc running. Got the bike back on the road a couple of weeks ago and have done about 300 miles on it. Think before i owned the bike it had been stood a while and wasn't running when i bought it . I got the bike running, The problem was that the exciter had corroded and was not earthing to the stator. I cleaned this up and the bike run perfectly.
The problem i have got now is the bike starts up and runs perfectly while it is cold, Once i 've rode the bike for about 5 mile it start to miss fire and splutter. If i carry on riding it get progressively until the bike losers all power and wont pull at all. So limp the bike home and leave it till the next day and it starts up straight away again 
Anyone any ideas what i should start looking at on the bike? Anyone had similar problems??
Also the bike seems to be blowing gearbox oil from the breather at the back of the engine. Any ideas why it is doing this??
Cheers Gillybobs
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Posted: Mon Jun 02, 2008 8:22 pm
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Vindaloobeast Rear-wheel Steering! Joined: 25 Aug 2005 Total posts: 2623 Location: Gloucester |
Crank seal gone pressurising gearbox/casings..just a thought..! Whats the right side plug look like..?
Beast.
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Posted: Mon Jun 02, 2008 8:30 pm
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GillybobsSuburban Commuter Joined: 25 Oct 2007 Total posts: 60 Location: Sheffield,South Yorkshire |
The right plug looks good to me . Just looks brown. Another thing i forgot to mention is the bike has strong smell. Maybe burnt oil  Did wonder about the crank seals. Just wondered if these are the symptoms of blown cranks seals. Dont want to strip the bike to replace something thats ok and do work on it for nothing.
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Posted: Mon Jun 02, 2008 10:00 pm
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gary-rd-robbo![[RD/RZ Blood Donor]](../img/pipsvip.jpg "RD/RZ Blood Donor")
RD/RZ Blood Donor One-handed Stoppie! Joined: 07 Oct 2007 Total posts: 2311 |
had similar problem to you when warm on a ypvs.
turned out seals were gone but looked ok when inspected..watch for "grooves " in l/h shaft though and on r/h spacer.
oil from back could be oil over fill but going with beasts theory seal pressurising gearbox up.
did you also check the stator was in good condition??
had a ypvs one that made bike splutter like mad then coil went o/c on the source coil...hope this helps.
in wakefield if you need a hand.
gaz
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Posted: Tue Jun 03, 2008 2:56 am
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GillybobsSuburban Commuter Joined: 25 Oct 2007 Total posts: 60 Location: Sheffield,South Yorkshire |
The stator and ignition coil all checked out ok as per the haynes manual. Might spend an hour going through them again though just to make sure. If there all ok think i ll have a look at the crank seals.
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Posted: Tue Jun 03, 2008 6:46 am
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cb250g5 Mmm, Fully Synthetic! Joined: 03 Dec 2005 Total posts: 1139 |
Might be fuel starvation. Once it starts playing up, try opening the fuel filler, let some air back in. Could be the breather blocked. Easier to try than an engine strip anyway, and would explain why it's OK again later.
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Posted: Tue Jun 03, 2008 8:01 am
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GillybobsSuburban Commuter Joined: 25 Oct 2007 Total posts: 60 Location: Sheffield,South Yorkshire |
I did pull the pipes off the petrol tap and loads of fuel did come out. Might give it a go though, Im all for the easy options first 
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Posted: Tue Jun 03, 2008 8:09 am
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VindaloobeastRear-wheel Steering! Joined: 25 Aug 2005 Total posts: 2623 Location: Gloucester |
| cb250g5 wrote: |
| Might be fuel starvation. Once it starts playing up, try opening the fuel filler, let some air back in. Could be the breather blocked. Easier to try than an engine strip anyway, and would explain why it's OK again later. |
Fuel starvation wont pressurise the engine.
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Posted: Tue Jun 03, 2008 4:03 pm
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cb250g5Mmm, Fully Synthetic! Joined: 03 Dec 2005 Total posts: 1139 |
| Vindaloobeast wrote: |
| cb250g5 wrote: |
| Might be fuel starvation. Once it starts playing up, try opening the fuel filler, let some air back in. Could be the breather blocked. Easier to try than an engine strip anyway, and would explain why it's OK again later. |
Fuel starvation wont pressurise the engine.
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May be 2 unconnected faults.
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Posted: Tue Jun 03, 2008 10:07 pm
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VindaloobeastRear-wheel Steering! Joined: 25 Aug 2005 Total posts: 2623 Location: Gloucester |
Listen , you dont have to tell me mate..a twisted crank, blocked carb, faulty needle valves and 200 hours of blood sweat and tears and three years...!
Patience triumphs over 2-strokes..
Beast.
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Posted: Tue Jun 03, 2008 10:54 pm
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GillybobsSuburban Commuter Joined: 25 Oct 2007 Total posts: 60 Location: Sheffield,South Yorkshire |
Well I ve had the bike back running spot on tonight. done about 30 miles with out a problem. Feel a bit of a plonker after finding the problem. After doing a few miles on the bike the other weekend i had a check round the bike. Was a bit worried about the little screw in the exciter coil coming loose so i loctited it in. Loctite must not conduct electricity very well as when checked the exciter coil again it had a high resistance . Anyway clean the coil all back up again and got rid of the loctite and the bike ran quite well again so fingers crossed thats it.
As for the oil at the back of the engine while id got the tank off noticed one of the petrol pipe had perished and was weeping petrol. Think this was running down the back of the engine and all the muck and crud was sticking to that. Have to see when I ve clean the bike up again the give it a run again.
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Posted: Wed Jun 04, 2008 8:36 pm
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