• To ALL forum users - As of late I have been getting quite a few private messages with questions about build ups here on the forum, or tech questions about your personal project. While I appreciate the interest, sending me a private message about these topics distracts from, and undermines the purpose of having a forum here. During the day I wear many hats as a small business owner-operator and I work tirelessly to provide the absolute best service possible to you, our valued customer. When I created this forum I rounded up some of the best minds I knew so that any tech question you might have could be asked and answered by either myself or one of my highly experienced moderators, this way the next time this same question is asked the answer can be easily found and utilized by the next IH enthusiast having the same question. This allows me the freedom to run the day to day operations of the business and minimize the impact to shipments and shop activities that these distractions can cause. It is of the up most importance for me to complete the daily tasks in order to best take care of you our customer, all the while providing you a forum to get the level advice and input you have come to expect and deserve from the premier IH shop in the country.

    So with that I ask that anyone with a question about one of our build ups or a general tech question to please use the forum as it was intended. I am absolutely available by telephone to answer your questions as well but at times may direct you back to our website to better field your question or questions. Most other private messages I will be glad to answer for you.

    Thank you for your understanding.

    Jeff Ismail

do I need a rebuild ?

My 67 800 has not run in over a year (maybe 2) I started it up and ran it a couple of miles ran great- then as I pulled up to the driveway the 800 acted like it was out of gas I say the fuel filter was really dirty- changed it and nothing I can see and hear the (Electric)pump pumping It'll start but I have to have it run at 2,000rpm or it will NOT stay running at idle- The carb is a Summit Racing 4bbl carb(600CFM) - and it has been a great carb for me-
The last time I rebuilt the carb was about 3-4 years ago- any ideas? Thanks in advance


The dirty fuel filter is your most telling clue. The fuel supply went stale from sitting so long. Gas just doesn't keep that long. More than likely, some junk made it past the filter and found its way into the tiny idle circuit passages in the carb. That's why it won't idle, but you can keep it running by adding throttle. You might have some luck by removing the idle mixture screws, blasting a jet of carb cleaner spray into the hole followed by compressed air. Then reset the mixture screws. You probably ought to purge that fuel supply and clean out as much of your fuel delivery plumbing, even the tank itself. Replace filters and start with a fresh fuel supply.


Not only is that old gas hard on the fuel lines and carb, but burning it through the engine can actually cause damage. And you can't refresh it by mixing new with old. All that does is taint the new fuel. You can add Marine Stabyl to fresh fuel and that will help preserve it for awhile longer, but even that has its limits.