- Posts: 1
- Thank you received: 0
KZ250A missfires on high revs then dies when hot??
- Nightwar
- Topic Author
- Offline
- User
- KZ250A
Less
More
25 May 2016 03:47 #728375
by Nightwar
KZ250A missfires on high revs then dies when hot?? was created by Nightwar
Hi! Im a new member on here, and this is my first post and question.
I just baught a old 1981 KZ250A (twin), and i hav the problem thatI cant get it to run clean on higher revs,
and as soon it gets a bit warm it looses power more and more, finnaly I have to give it full throttle just to keep it alive and get only low rpm untill it dies completly. If I let it cool down, it fires up just fine again, but still vit the high rev issue.
Anyone have any ideas?
I baught anothe 1979 KZ250A for parts, and I changed the whole engine, exept ignition coils, carb and stator. It has to be in one of them i guss?
I aprechiate all help i can get!
Greatings from Sweden!
I just baught a old 1981 KZ250A (twin), and i hav the problem thatI cant get it to run clean on higher revs,
and as soon it gets a bit warm it looses power more and more, finnaly I have to give it full throttle just to keep it alive and get only low rpm untill it dies completly. If I let it cool down, it fires up just fine again, but still vit the high rev issue.
Anyone have any ideas?
I baught anothe 1979 KZ250A for parts, and I changed the whole engine, exept ignition coils, carb and stator. It has to be in one of them i guss?
I aprechiate all help i can get!
Greatings from Sweden!
Please Log in or Create an account to join the conversation.
- martin_csr
- Offline
- User
Less
More
- Posts: 8068
- Thank you received: 1656
25 May 2016 04:34 - 25 May 2016 05:08 #728376
by martin_csr
Replied by martin_csr on topic KZ250A missfires on high revs then dies when hot??
It could be the battery or the ignition coils. The bike needs a good fully charged battery to run right.
high beam load test: engine off, high beam on, battery charged --- a good battery will drop from 12.6+ to about 12.2 VDC.
A simple check for the coils is to ride the bike at high speed, then stop & feel them, press hard with your fingers --- they should be warm, not hot. Or do the ignition coil tests outlined in the manual --- check them cold & hot.
high beam load test: engine off, high beam on, battery charged --- a good battery will drop from 12.6+ to about 12.2 VDC.
A simple check for the coils is to ride the bike at high speed, then stop & feel them, press hard with your fingers --- they should be warm, not hot. Or do the ignition coil tests outlined in the manual --- check them cold & hot.
Last edit: 25 May 2016 05:08 by martin_csr.
The following user(s) said Thank You: Nightwar
Please Log in or Create an account to join the conversation.
- TexasKZ
- Offline
- Platinum Member
Less
More
- Posts: 7566
- Thank you received: 2234
25 May 2016 05:39 #728389
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic KZ250A missfires on high revs then dies when hot??
Have you checked valve lash? If they have not been checked and adjusted in many miles, there may be little or no lash, which can cause the symptoms you describe.
Might also be a kinked fuel line or a clogged or improper fuel filter.
Might also be a kinked fuel line or a clogged or improper fuel filter.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Please Log in or Create an account to join the conversation.