gk76 gsxr400 engine problem
Forum rules
Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
-
kasandrich
- Settled in member
- Posts: 6
- Joined: Mon Apr 02, 2012 8:51 pm
gk76 gsxr400 engine problem
Hi all, I am after some help, my Son has bought a GK76a GSXR400 engine and transplanted it into a buggy.
He was told the engine was all good.
It came complete with loom & cdi unit
It starts fine and will tick over for ever. But if you touch the throttle it revs ok but cuts out when you release the throttle, and it has us completely stumped, the carbs have been off and all 3 jets cleaned.
The spark plugs are a little black so its running a liitle rich.
When he got it, there were some resistors soldered into the loom across the ignition pick up, which he foolishly disposed of.
It is the later version with the throttle position sensor, adjusting the throttle position sensor seems to affect the sensitivity to this cutting out when the throttle is released but does not cure it.
When its running it sounds fine and when it cuts out it is like its been switched off, if it were carburation I would expect it to splutter to a halt.
Does anyone have any suggestions what the resistors across the pick up could have been for? is the a bodge to ovrcome the issue of having the wrong pickup for the cdi unit or something? if so does anyone have details of the mod?
Any help or suggestions welcomed. He is at his wits end.
Buggy located in Braintree Essex.
He was told the engine was all good.
It came complete with loom & cdi unit
It starts fine and will tick over for ever. But if you touch the throttle it revs ok but cuts out when you release the throttle, and it has us completely stumped, the carbs have been off and all 3 jets cleaned.
The spark plugs are a little black so its running a liitle rich.
When he got it, there were some resistors soldered into the loom across the ignition pick up, which he foolishly disposed of.
It is the later version with the throttle position sensor, adjusting the throttle position sensor seems to affect the sensitivity to this cutting out when the throttle is released but does not cure it.
When its running it sounds fine and when it cuts out it is like its been switched off, if it were carburation I would expect it to splutter to a halt.
Does anyone have any suggestions what the resistors across the pick up could have been for? is the a bodge to ovrcome the issue of having the wrong pickup for the cdi unit or something? if so does anyone have details of the mod?
Any help or suggestions welcomed. He is at his wits end.
Buggy located in Braintree Essex.
-
Variablevalves suck
- Site Supporter
- Posts: 1922
- Joined: Sat Jan 24, 2009 10:52 am
- Bike owned: GSXR Carb o'ring kits supplied
- Location: Stoke-on-trent
Re: gk76 gsxr400 engine problem
No idea what the resistor was, when you say cross the ignition pickup where do you mean?
Are you running the air box? and if so are all the float bowl pipes connected up as the SP has pressurized floats.
Are you running the air box? and if so are all the float bowl pipes connected up as the SP has pressurized floats.
-
kasandrich
- Settled in member
- Posts: 6
- Joined: Mon Apr 02, 2012 8:51 pm
Re: gk76 gsxr400 engine problem
Yes he has the carb bowl pipes connected up.
By across the pickup, I mean between the two contacts, ie across or in parallel to the pickup.
Does anyone have any more information on the throttle position sensor? How can he test it? is there ar setup proceedure, what symptoms does a faulty sensor cause?
By across the pickup, I mean between the two contacts, ie across or in parallel to the pickup.
Does anyone have any more information on the throttle position sensor? How can he test it? is there ar setup proceedure, what symptoms does a faulty sensor cause?