|
|
Post by crm on Aug 21, 2018 13:24:57 GMT 1
Hi guys, its been a while since i rode my 125 much over the years, the odd run around the block and back, and it has always gone fairly well until the stator failed.
While mine was rewound, the top end was refreshed and its just never felt quick or even dare i say run well.
Anyway its a Mk3 1989 1GU with powervalve and a Gibson pipe.
Symptoms, its a bitch to start, smokes like hell and 4 strokes for a good 5 mins and once it does make it to the power band its very flat and barely quicker than my KSR80 when it used to be much quicker.
It tops out around 70 when it used to see 85+ but more worryingly it gets pretty hot and on something a like a dual carriageway feels like it seizing however i suspect it more fuel related and perhaps low fuel level in the carb maybe.
So if anyone has a good working spare carb i would like to start there if possible and some base settings jet wise (is it a 190 for the full power bike)
Half tempted to lift the top end as a matter of course to satisfy myself the cylinder and piston are all good and there was no seizures. I am quite used to strokers running a CR250 supermoto on track and it felt more like fuel starvation and the difficulty starting and un willingness to rev again points to carb and possibly crank seals too perhaps.
|
|
|
|
Post by jorjasfather on Aug 23, 2018 19:25:30 GMT 1
I’d try the crank seal on both sides they dry out over time then start to pass
|
|
|
|
Post by markhoopy on Aug 24, 2018 10:19:03 GMT 1
+1 on the crank seals.
|
|
|
|
Post by crm on Aug 26, 2018 14:56:46 GMT 1
I thought as much, can these be done in situ like some bikes or is it a full strip ?
I know they were only done around 4 years ago and not many miles ago - i do wonder if they were genuine seals or cheapo ones ?
Am i correct in assuming genuine every time ?
|
|
|
|
Post by museumman on Sept 17, 2018 10:22:47 GMT 1
Don't rule out the CDi playing up and the stator not being rewound properly. I've been selling these for 15 years and they've all started to go now. I no longer sell used CDis or Stators, as customers also discovered troubles,. They do sometiems feel like fueling problems. The DT YPVS as several people on this forum know are b*****ds. There are 3 companies making CDis now for the DT one of them bypassing the priamry coil under flywheel and using the battery instead with new electronics. Very expensive though. I need to get around taking one of my bikes to a specialist and having them reproduced.
|
|
|
|
Post by crm on Sept 17, 2018 21:01:32 GMT 1
Don't rule out the CDi playing up and the stator not being rewound properly. I've been selling these for 15 years and they've all started to go now. I no longer sell used CDis or Stators, as customers also discovered troubles,. They do sometiems feel like fueling problems. The DT YPVS as several people on this forum know are b*****ds. There are 3 companies making CDis now for the DT one of them bypassing the priamry coil under flywheel and using the battery instead with new electronics. Very expensive though. I need to get around taking one of my bikes to a specialist and having them reproduced. Soooo the next question would be - care to sell me a CDI so i can do a back to back test and either rule it out or get lucky ? |
|
|
|
Post by museumman on Sept 17, 2018 23:07:09 GMT 1
Don't rule out the CDi playing up and the stator not being rewound properly. I've been selling these for 15 years and they've all started to go now. I no longer sell used CDis or Stators, as customers also discovered troubles,. They do sometiems feel like fueling problems. The DT YPVS as several people on this forum know are b*****ds. There are 3 companies making CDis now for the DT one of them bypassing the priamry coil under flywheel and using the battery instead with new electronics. Very expensive though. I need to get around taking one of my bikes to a specialist and having them reproduced. Soooo the next question would be - care to sell me a CDI so i can do a back to back test and either rule it out or get lucky ? I can only lend you one, or better still send me yours to test on my best running bike to eliminate it. |
|
|
|
Post by crm on Sept 18, 2018 7:50:25 GMT 1
Soooo the next question would be - care to sell me a CDI so i can do a back to back test and either rule it out or get lucky ? I can only lend you one, or better still send me yours to test on my best running bike to eliminate it. That sounds like a plan. Can you PM me some details please - and i will get that in the post to you. The bike as you know was perfect, around 6 years ago it suddenly went very flat and it turned out to be the stator it seemed - so was repaired. Its never exactly felt "alive" since, It was rebuilt and freshened up and never seemed to be as good as it originally was - so perhaps it is the CDI then after all. Anyway i am sure you can put that theory to the test - appreciate that |
|
|
|
Post by simon998 on Sept 18, 2018 13:19:18 GMT 1
Sounds exactly how my 125 is performing after a rebuild and gasket/seal refresh.
I've just bought some OEM crank seals from norbo and need to get them fitted. I brought the stator to a local rewind place and they tested it and it came back 100%.
The barrel gets very hot, struggles to get into the powerband and occasionally backfires. It's spitting a good bit of fuel out the carb too I noticed.
|
|
|
|
Post by reedpete on Sept 19, 2018 18:20:46 GMT 1
Have you checked the reeds are ok? Spitting fuel from the carb is very strange .
|
|
|
|
Post by 125lc1dt on Sept 24, 2018 9:21:39 GMT 1
Most unusual spitting fuel from carb. Best check the reeds as they should seal any back flow into the carb.
|
|
|
|
Post by reedpete on Sept 24, 2018 9:46:18 GMT 1
it’s monday morning so it’s understandabke ...but there’s a bit of an echo !
|
|
|
|
Post by 125lc1dt on Sept 27, 2018 9:06:30 GMT 1
Over time Have seen several posts regarding worse engine performance after engine rebuilds. Friend of mine RD 400 never ran 100 % after engine rebuild. Turned out company fitted wrong pistons which changed porting charactristics etc. Possible ?
|
|
