Question about Crosman (4032)

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Lack of air power

I have an american classic 1377 and hope to fix it myself. It is the most accurate and powerful I have ever run across. Lately When I go to pump it up it has no resistence at all as I pump the handle, it dosen't pressurize at all. Can I get a repair kit, what do you call this part kit and where do I get it.

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  • 231 Answers

Check out the manual and parts diagrams on this site. They do carry some parts.

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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1 Answer

Settings for mixture screws


Most Chain Saw Engines Have Three Carburetor Adjusting Screws:
1. Idle Speed/Throttle Stop - This is the adjustment that controls how much the throttle valve (butterfly) stays open when the throttle trigger is released. If this adjustment is set too low, the engine will die when the throttle trigger is released. The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. This is a dangerous condition and should never be allowed.
2. Low Speed Fuel Adjustment (marked L on carb, this is the low speed jet)- This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at idle speed. An adjustment that is set too rich will cause the engine to load up and die at idle speed. A mixture that is too lean will starve the engine and cause it to race or surge. An extremely lean adjustment will cause the engine to die, too.
3. High Speed Fuel Adjustment (marked H on carb, this is the high speed jet) - This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at cutting speed. It would not be accurate to say that this is the most important setting, because all of these adjustments need to be accurate for a saw to perform its best, but this is the adjustment that determines how the saw runs in the cut. An adjustment that is set too rich will not allow the saw to reach the RPM level necessary to build maximum power. Throttle response may also be sluggish and the engine would smoke and perform poorly. A mixture that is too lean will allow the engine to reach an RPM level where bearing failure and cylinder seizure are likely. It will also lack power in the cut and tend to run very hot.
The preceding information briefly explains rich and lean running conditions. It also identifies the three adjustment screws and their function. It should be noted that some chain saws lack the high speed adjustment needle. These saws have what is called a "fixed jet" which is set from the factory. "Fixed jet" carburetors are used to prohibit the saw operator from setting the adjustment too lean and damaging the saw. Unfortunately, they also often prohibit the saw from achieving maximum performance.

Apr 11, 2016 | Garden

1 Answer

I have a crossman 1377 (177) cal pellet pistol. Is it ok to shoot BB'S in this gun? Does it damage the rifling in the barrel? Thanks, Gary


yes it safe to shoot bb,s in the 1377 pump pistol,i have 3 of them they actually shoot true'er and with more vilocity

Sep 19, 2011 | Crosman 1377 177 Single Shot Air Pistol

1 Answer

Older Crosman 1377 Air Pistol. Believed to be bad seals. I'm told I can buys the seals from plumbing supply store and fix is easy to do myself with no experience. True?


Yes. This is as simple as replacing O-rings and seal bushings. you may get out for less than $5 worth of supplies. Just be sure to label everything as you take it out of the gun and lay out the parts in the order you removed them. this will make reassembly MUCH less painful. Oh yeah.... remember to clean and oil the parts as you put them back in.

Apr 11, 2011 | Crosman 1377 177 Single Shot Air Pistol

2 Answers

I have a 1992 yz125 runs good but when riding its like it has no power


Lack of power is usually bad valves. Clean the air cleaner and do a compression check. Could you take a moment and rate my answer? Thanks!

Sep 20, 2009 | 2003 Yamaha YZ 125

1 Answer

2001 elantra lack of power


Confirm ur fuel pump is working. Ensure ur pickup tube is not blocked. Then ensure u did not leave a rag or parts in the manifold tubes. Not laughing it happens. Is the distributor in the right spot. Etc etc. Did u rehook the alt up if removed . Is tje battery fully charged. And lastly is the fuel flowing and freash. Then recheck your work did u replace all parts right. Any air in the head gasket will make the fuel /air mixture off.
Good luck

Jul 16, 2017 | 2001 Hyundai Elantra

1 Answer

Stage 1 jets didnt work


pull the breather cover off and see how it does it sounds like you need more air going in when you go up on jet size it will change the air fuel ratio thus making it lack power or just run absolutely funny

Jan 14, 2009 | 2004 Yamaha V Star Classic

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