bull8042
Active Member
- Messages
- 73
- Location
- Fort Mill, SC
I took my 5.9 XL out this morning for its initial break-in. The temp outside was about 43*F and overcast. The first 1/2 tank was HPI 30% Nitro before switching to Byron's 30% Nitro. The mill would not idle worth a crap regardless of what I tweaked. If I idled it up a lot, I could keep it running until the temp went over 200*. It would then idle decently for a moment then surge and scream, sputter, drop back to idling smooth, repeat ad naseum. Think of a 2 or 3 cylinder engine that was having a cylinder dropping out. That is what is was running like.
I finally pulled the carb, removed every needle and lubed the o-rings, reset everything to factory and re-installed. Whatcha know? It fixed the idle problem and all seemed normal. However, one thing didn't improve. The high temps. Even at the factory settings, I never got above mid-throttle and the temps would climb to 340*+!!!!! I richened the high speed and low speed needles to the point it was 4-cycling and would hardly run. No help. The pinch in that engine is unbelievable compared to the 4.6 I broke-in last weekend. So I am sure that is contributing to the temps.
I don't know what to do now. I was afraid to begin tuning since leaning it is not going to make the temps any lower, but the performance as it is sucks. So, what say you experts? Ignore the temps and go by smoke and performance? If I tune regarding temps, I am going to have to add a freakin' wet crankcase and an oil cooler......or a radiator! :dunno:
I finally pulled the carb, removed every needle and lubed the o-rings, reset everything to factory and re-installed. Whatcha know? It fixed the idle problem and all seemed normal. However, one thing didn't improve. The high temps. Even at the factory settings, I never got above mid-throttle and the temps would climb to 340*+!!!!! I richened the high speed and low speed needles to the point it was 4-cycling and would hardly run. No help. The pinch in that engine is unbelievable compared to the 4.6 I broke-in last weekend. So I am sure that is contributing to the temps.
I don't know what to do now. I was afraid to begin tuning since leaning it is not going to make the temps any lower, but the performance as it is sucks. So, what say you experts? Ignore the temps and go by smoke and performance? If I tune regarding temps, I am going to have to add a freakin' wet crankcase and an oil cooler......or a radiator! :dunno: