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22 Posts
Hello all,
2011 Grizz 450 Stock no mods. 142 ft elevation
Working on the Grizzly for a friend, looking for some help. It sat for a year or more in his shed. Trying to troubleshoot on the cheap since he's on a low budget. Can't for the life of me get her right. Haven't ridden only troubleshooting in garage. Compression seems looow at ~95 I did get a 120psi reading once. Compression didn't go up much when adding oil in cylinder. I modded my Blaster leakdown tester to attempt a leak test but she wouldn't hold. The main issue is when at operating temp, it runs like crap. It will rev high then drop rpms and want to stall. When I hit throttle (quick acceleration) it sputters bad and will not rev.
Symptoms:
Hard start cold. Need choke and throttle but she will fire up no issue.
Will not hold idle until warm but when I blurp throttle rpm's will raise for a bit and then eventually drop and cut out if not on throttle. There is no air filter or guide at the moment I'm ordering parts.
When fully warm/hot it will sputter bad on quick acceleration over 1/4 throttle in neutral also. will not idle.
Also sputter when slow acceleration at higher rpm but before limiter. neutral. There is no air filter
This to me seems like a fuel issue but I've check, triple checked carb jets, float height. Intake boot seems ok, no cracks and sealed. I'm leaning toward top end/valve issue.
Things I've done.
New Plug
Adjusted valves to spec
Flushed tank and cleaned petcock. fuel delivery is good.
New 93 octane
Oil and filter change
Seafoam treatment
Carb clean x5.
New "jet kit" stock - amazon. (but does the same with oem jets.)
A/F screw 2 1/2 out.
Anything else I can try?
Thank you!!
2011 Grizz 450 Stock no mods. 142 ft elevation
Working on the Grizzly for a friend, looking for some help. It sat for a year or more in his shed. Trying to troubleshoot on the cheap since he's on a low budget. Can't for the life of me get her right. Haven't ridden only troubleshooting in garage. Compression seems looow at ~95 I did get a 120psi reading once. Compression didn't go up much when adding oil in cylinder. I modded my Blaster leakdown tester to attempt a leak test but she wouldn't hold. The main issue is when at operating temp, it runs like crap. It will rev high then drop rpms and want to stall. When I hit throttle (quick acceleration) it sputters bad and will not rev.
Symptoms:
Hard start cold. Need choke and throttle but she will fire up no issue.
Will not hold idle until warm but when I blurp throttle rpm's will raise for a bit and then eventually drop and cut out if not on throttle. There is no air filter or guide at the moment I'm ordering parts.
When fully warm/hot it will sputter bad on quick acceleration over 1/4 throttle in neutral also. will not idle.
Also sputter when slow acceleration at higher rpm but before limiter. neutral. There is no air filter
This to me seems like a fuel issue but I've check, triple checked carb jets, float height. Intake boot seems ok, no cracks and sealed. I'm leaning toward top end/valve issue.
Things I've done.
New Plug
Adjusted valves to spec
Flushed tank and cleaned petcock. fuel delivery is good.
New 93 octane
Oil and filter change
Seafoam treatment
Carb clean x5.
New "jet kit" stock - amazon. (but does the same with oem jets.)
A/F screw 2 1/2 out.
Anything else I can try?
Thank you!!