Jetting Hitachi Carb at altitude
I just got a 88.5 Sammi. 1300 cc
It has only 38000 on it with 31's and a Calmini 3" spring under lift kit. I had to remove the ft. bumper and mounts. It is a one owner and was owned by an old couple who towed it behind the RV. It is such an awesome rig. Looks like new except for some stitching rot on the rear seat.
Anyway I live in Denver area and go up to 10000' or higher. It runs very rich all the time and secondary operation is useless. I did 100 miles full throttle going to Neb. and it got 14 mpg. No power at all. Gets 23 mpg on primary cruising at 55 mph. I believe it has stock gearing so that is the next project. Going with a transfer case gear swap from Spidertrax who are 15 miles away from me.
Smells like rotten eggs and rich condition.
I had no exploded view of parts breakdown for this at the time I took the top off. I did now find one on Autozone.com. I think there are some hidden jets under jets that I didn't see until I got the exploded view.
Has Hitachi carb. I took the top off and wrote down all the jets that I could see including the mains. Not sure what I'm looking at though.
One in the middle and the two on the sides of the ports. 3 jets in the top, 70 secondary side, 140 primary side and 65 middle.
3 on the top of the base. 70 secondary, 100 primary and 60 middle.
Mains are 85 primary and 140 secondary.
Starts fine when cold and slow to start when hot. It has a rich start when hot.
I would like to keep this carb for now. It is like new but a bit confusing with all the electrics and vacuum lines. I will replace it later for more power, but I'm up for the challenge first. I don't believe this has been driven hardly at all. The miles on it are mostly tow miles. Not rust spot on it except minor discoloration under bra.
Are these stock jets? It seams a bit off to me. I was a tune-up tech in my youth but not on this carb. I had many VW bugs, some with dual Webers for the drags and most with Zenith carbs for my baja's. What I'm saying is that I'm familiar with fiddling to make things work.
Can you give me a jet configuration for this altitude?
I know I should go FI with these altitude changes being so extreme. Is there a kit for that swap so I can research that option?
Thanks so much for any help.
Last edited by geckocycles; 08-06-2007 at 08:37 AM.