I just built up a new short block, broke it in well and ran one 30 lap race on the motor, it ran well. This past weekend it was running well for about 5-6 laps and then slowed down , (Sr. 206) would only turn 4900 rpm, I pulled in and check throttle linkage etc. went back out and it ran well for 2 laps then went back to slow and after another lap it started making a ticking noise internally, I pulled the valve cover and check the lash and all was good. Would a unconnected ez start clip cause this and if so will it require another short block?
Lo206 ez start
- Thread starter John Cobb
- Start date
Gab507
Member
IF your compression release has failed you will know it. It will be so hard to pull you will probably need shoulder surgery. These are things either I check or walk customers through. Is there anything unusual in the oil? If there is a noise check these,
Check to make sure it has compression by pulling the rope to TDC.
Make sure the coil hasn't slipped and rubbing the flywheel and that the plug wire is firmly connected to the coil and plug (push both in very hard)
Check the entire valve train to make sure the cylinder plate bolts are tight and rocker studs are tight.
Double check the lash.
Low rpm is usually carb
Clean the carb especially the pilot jet (very easy to get plugged
Change the plug.
Check to make sure it has compression by pulling the rope to TDC.
Make sure the coil hasn't slipped and rubbing the flywheel and that the plug wire is firmly connected to the coil and plug (push both in very hard)
Check the entire valve train to make sure the cylinder plate bolts are tight and rocker studs are tight.
Double check the lash.
Low rpm is usually carb
Clean the carb especially the pilot jet (very easy to get plugged
Change the plug.
CarlsonMotorsports
Site Supporter
^ All good checks.
Also, what did you torque the head gasket to?
Any changes in your oil routine? The "clicking" sound concerns me, especially if it's more than just some valve train clatter.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
www.youtube.com
34 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com
Also, what did you torque the head gasket to?
Any changes in your oil routine? The "clicking" sound concerns me, especially if it's more than just some valve train clatter.
-----
Thanks and God bless,Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
www.youtube.com
34 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com
CarlsonMotorsports
Site Supporter
...and agree, it's not the compression release causing low rpm.
It would not be the compression relief. It would only effect the engine when pulling it over.
The cam issue has been solved for some time, the new cams have a much better hardening process. Have not seen much wear in several years.
The intermittent nature of the problem tends to indicate carb issues. I would start there. Make sure the choke lever is not coming up while on the track. It will cause an intermittent problem like you are describing.
I am not sure about the "ticking" sound as these engines make a lot of noise and you may be hearing it now just because your looking and listening for something. That said, check to make sure the coil has not slipped and making contact with the flywheel. Check head bolt torque and the rocker plate between the head and the rockers.
The cam issue has been solved for some time, the new cams have a much better hardening process. Have not seen much wear in several years.
The intermittent nature of the problem tends to indicate carb issues. I would start there. Make sure the choke lever is not coming up while on the track. It will cause an intermittent problem like you are describing.
I am not sure about the "ticking" sound as these engines make a lot of noise and you may be hearing it now just because your looking and listening for something. That said, check to make sure the coil has not slipped and making contact with the flywheel. Check head bolt torque and the rocker plate between the head and the rockers.