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Old 10-10-2017, 03:12 AM   #61
1975IH200
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Default Re: international loadstar 1600 carb problems

Trevor, he has only been working this for 2 1/2 years, what's the rush? LOL
But seriously....

To the OP: Check the stickies in the Ignition Tech Forum.
There are a few threads there that have this info.
It has been there all along.
Help yourself to the knowledge base that already exists.

It is simple engine timing, not rocket science.
If you do not understand the operation of a 4 stroke cycle internal combustion engine, then study up on how they operate.

Then you will understand better.

There is nothing special or magical about the IH SV-8 engines.
Only attach timing light to #8, instead of #1 as on most other mfr's engines.

Need further assistance???, just ask.
We are all trying to help you here.

Let's get this engine running !!!!!
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Old 10-10-2017, 07:01 AM   #62
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Default Re: international loadstar 1600 carb problems

Troof.
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Old 10-20-2017, 02:21 PM   #63
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Default Re: international loadstar 1600 carb problems

So i finally got the truck running and am working on timing it but i have hit a small snag. In order to turn the distributor far enough to get the engine to the correct timing i am going to have to un hook the vacuum governor line (the bottom of the two vacuum lines i am assuming is the governor line). Can i simply unhook the line and plug the vacuum ports?
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Old 10-20-2017, 06:57 PM   #64
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Default Re: international loadstar 1600 carb problems

I assume you're rotating the dist in a CCW direction to advance the timing, correct? What initial timing number are you trying to hit and where are you at now? If a hard line or other obstruction is preventing you from rotating the dist any further in that direction, your distributor stab was off by a tooth. Its easy to do, even for an experienced wrench.
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Old 10-21-2017, 05:25 PM   #65
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Default Re: international loadstar 1600 carb problems

I don't know how all that governor stuff works, so I'd lean toward keeping things connected.
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Old 10-24-2017, 03:48 PM   #66
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Default Re: international loadstar 1600 carb problems

So i re routed the vacuum line and can now adjust the distributor through the full range of timing marks. I have the dis set at about 5 degrees advance if the 0 to 25 degree marks are the advance side. The trouble i am having now is it doesn't seem to matter what i set the dis to the engine will start and idle but when i give it any gas it will back fire like crazy any ideas?
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Old 10-24-2017, 06:03 PM   #67
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Default Re: international loadstar 1600 carb problems

The largest side of the scale with the most tick marks and numbers visible is the advance side. Is the popping back through the carb or out the exhaust?
First thought is two or more spark plug wires are out of order. Second thought is the engine is starved for fuel at higher rpms.
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Old 10-29-2017, 01:37 PM   #68
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Default Re: international loadstar 1600 carb problems

Quote:
Originally Posted by Scoutboy74 View Post
The largest side of the scale with the most tick marks and numbers visible is the advance side. Is the popping back through the carb or out the exhaust?
First thought is two or more spark plug wires are out of order. Second thought is the engine is starved for fuel at higher rpms.
I have checked and rechecked the firing order and am sure the wires are correct. The backfiring is coming out the carb and the exhaust at times. i put the oil bath filter on and that seemed to help the backfiring a little also under load driving around doesnt seem to do it as much. Also when the truck is just sitting and you pull the choke and rev the engine it doesnt backfire. So im guessing it must be a fuel issue. Any idea where to start?
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Old 10-29-2017, 06:20 PM   #69
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Default Re: international loadstar 1600 carb problems

All the things you're saying are pointing to problem with the air/fuel ratio. Too much air and not enough fuel. Its most likely somewhere in the carb. If you've got a vacuum gauge, it would be good to connect it to a manifold source and get a vacuum reading of your engine at hot idle. If you don't have a gauge, I suggest getting one. You might have an external vacuum leak somewhere. If there's no external leak, then the leak is internal, is inside your carb.
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Old 10-30-2017, 08:26 AM   #70
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Default Re: international loadstar 1600 carb problems

I agree with most of what Scoutboy says. But if you can idle smoothly then there is probably not an external vacuum leak. What you are describing sounds like lean main jets

My Loadstar is very cold blooded and backfires out the carb, when cold, because it is jetted really lean. Does the backfiring go away when it's given some choke? My '71 Travelette was jetted lean too. Going up 2 jet sizes made it run great. Have you run a wire through the main jets to see if they are fully open?
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Old 10-30-2017, 05:11 PM   #71
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Default Re: international loadstar 1600 carb problems

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Originally Posted by FDChappie View Post
I agree with most of what Scoutboy says. But if you can idle smoothly then there is probably not an external vacuum leak. What you are describing sounds like lean main jets

My Loadstar is very cold blooded and backfires out the carb, when cold, because it is jetted really lean. Does the backfiring go away when it's given some choke? My '71 Travelette was jetted lean too. Going up 2 jet sizes made it run great. Have you run a wire through the main jets to see if they are fully open?
Yes it stops when the choke is pulled but it dies when you try to drive it. Ill check the jets as soon as i can.
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Old 10-30-2017, 05:52 PM   #72
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Default Re: international loadstar 1600 carb problems

Is there any egr valve on this engine? My guess is you will find 51 jets. Please describe the choke position and how the engine sounds as it dies. Also have you looked for moisture under the distributor cap when it dies?
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Old 10-31-2017, 07:58 AM   #73
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Default Re: international loadstar 1600 carb problems

Quote:
Originally Posted by FDChappie View Post
I agree with most of what Scoutboy says. But if you can idle smoothly then there is probably not an external vacuum leak. What you are describing sounds like lean main jets

My Loadstar is very cold blooded and backfires out the carb, when cold, because it is jetted really lean. Does the backfiring go away when it's given some choke? My '71 Travelette was jetted lean too. Going up 2 jet sizes made it run great. Have you run a wire through the main jets to see if they are fully open?
The jets are a 58 size. Is that to big? I think i found a small vacume leak on the carb as well which is now fixed. There is no moisture under the cap that i have ever seen. I dont think it has an egr.
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Old 10-31-2017, 08:26 AM   #74
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Default Re: international loadstar 1600 carb problems

I wouldn't think those would be too big at all considering the weight of the vehicle/cargo and the fact that corn-shucked alkygazz wasn't what we had to try and make these pigs burn back in the day. You probably need to step up to #60's. Your carb is a Holley model 2300g (governed). That 2980 is the list number, not the model. There are elevendy-thousand list number variations of the model 2300. Some were governed, but most were not.

Are you sure you got your point gap set correctly? Do you have a dwell meter? No offense meant, but you're clearly a novice at this stuff, that's why I'm questioning your work. Its important to eliminate as many variables as possible. We still don't know for certain if this popping back through the carb is a fuel, ignition or mix of both.
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Old 10-31-2017, 08:53 AM   #75
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Default Re: international loadstar 1600 carb problems

That sounds reasonable with the 60 jets. ScoutBoy has prompted another idea I've seen bad condenser's have similar issues to what you describe.
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