Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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WONT START GOOD SPARK SPITS OUT OF CARB

WILL NOT START, SPITS OUT CARB, WE HAVE GOOD SPARK, LEAK DOWN TEST YEILDED POR RESULTS. GOOD COMPRESSION 175 LBS , THINKING ELECTRONC NEEDLE VALVE MAY NOT BE FUNCTIONING CORRECTLY / NEED SOME TYPE OF DIAGNOSTIC MANUAL

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This problem can't be the anti-diesel solenoid in the carb, that only does anything when the engine is shutting down.
Because you got poor results in the leakdown test and get 175 psi of compression (way too much), I suspect that either your intake valve is bad or misadjusted, or the key that holds the flywheel to the crankshaft is sheared off.
Check the valve lash settings and visually inspect the operation ov the valves while you're setting them. If the valves are OK remove the flywheel and check the key.

Carl

Posted on Dec 11, 2008

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1 Answer

2001 Intek 17.5 hp ohv. Does it have a low oil (pressure-ed) cutoff switch?


310000's are bad to blow the head gasket. Time for compression and leak-down tests. Also check you flywheel key.

Jun 14, 2015 | Garden

1 Answer

Model 175. Engine cranks will not start. What are to check out.


Hello David,
Three main things to check out are compression, spark and fuel. I would purchase a compression tester from a local parts store, they are fairly cheap and easy to use. Simply remove spark plug and screw tester into spark plug threads and turn engine over. Observe readings, you should have at least 60 psi. If not problem is internal and needs to be torn town. If compression is good, check spark with a spark tester, (also available from local parts stores). They simply plug inline between spark plug and boot. Turn engine over and observe sight glass in tester, you should see spark in sight glass when turning over. If compression and spark are both good, check fuel line to carburetor too see if its getting fuel, if not clean tank of obstruction, if it is hook line back up. If you are now getting fuel to carb, next remove air cleaner and spray a small amount of starting fluid into carb and attempt to start. If it starts temporarily and bogs down, you know the problem is carburation, because the engine is burning up the starting fluid as fuel, when the starting fluid is burned up, unit dies. Then carb will need to be removed and cleaned. Good luck and happy wrenching!

Sep 30, 2013 | John Deere Garden

1 Answer

I have a SRM2100 trimmer, it will not run unless the choke is full on and of course after it runs in this mode a little while, it fouls the plug and quits. I cleaned the carb, installed new kit, new...


hi there jaybolt

here is a website for parts

http://www.partstree.com/parts/?lc=echo&mn=SRM-2100+Type+1+S%2FN%3A+001001+-+159490

all being well and compression and spark and timming , muffler is clear , carby is clean , and diaphrams are all ok you mention carb rebuilt , fresh mix , and fuel filter and lines are good

does the unit run with 2 stroke mix in the plug hole - then stop ?
if yes assume compression and spark are ok,, if no check compression and spark and muffler

will the unit run with 2 stroke mix sprayed into the carby throat, then stop ?

if it does sounds like you have a air leak somewhere in the intake system

could be at barrel base gasket, c/case joint, manifold boot/ block gasket, carby gasket , impulse hose ,if this unit has one , c/case main seals leaking

2 strokes need air tight c/cases in order to pump fuel / air / oil mixture from c/case to cylinder
and to create a vacuum for entry of fuel/ air / oil mix from carb to c/case

symptoms of air leak are -: hard to start, wont idle, stalling, low power, inconsistant idle, over rev
overheat

pressure and vacuum testing can be done by blocking off intake and exhaust with rubber and metal plates , then fitting adapter to spark plug hole , and placing piston at bdc , pressureise cylinder to 7 to 8 psi of pressure and check areas , base gasket, manifold joint, main seals, , impulse hose ? for leaks with soapy water - if leaking bubbles will be evident

if no leaks and pressure is held at 7 psi for at least 2 minutes with dropping - presure test is good
next do the same test using vaccuum again go to 20 - 30 inch / vaccuum

if vaccuum held unit is ok

suggest take a good look at carby and recheck its rebuilt correctly and setup particularly if P and V test are good and spark coil tests good with a coil load test using a spark gap of 6.00 mm to stress the coil ( simulates spark under compression load)

have a look and let me know what you find

cheers pauly46

Jul 03, 2011 | Echo Garden

1 Answer

Im a small engine tech im working on a echo pb251 it has spark and getting fuel but will not start, even sprayed carb cleaner in cylinder and it will not fire any ideas


have you checked the muffler and ex port for carbon / blockage?


have you checked the timming key ?

does the unit have enough compression ? by enough i mean 100 psi or above is considered
the btm limit

does the machine fire on 2 stroke mix , if you pour some in plug hole ?

will it fire again if you spray into carb throat with the carb on ?

is the spark still there while under compression pressure ( test using spark tester ) connect between h t lead and spark plug, you should see it spark and jump a 6.00 mm gap to pass a spark load test

if the unit does not fire with mix in plug hole suspect compression ?

if the unit does not fire with mix sprayed into carb throat - suspect a induction problem

ie a air leak either around carb, manifold , or intake boot ( if it has one ), base gasket , crank seals or impluse hose or cracked insulator if it has one

either way i think you will need to pressure & vacuum test crankcases for leaks

you will need to block off intake and ex and put in a air adapter inthe plug hole to connect a pressure or vacuum tester

place piston @ bdc and pressurize to 7 -8 psi check around areas as above of leaks with soapy water , you will see bubbles where a leak is , but the pressure remains constant for at least 2 minutes thats good , the use a vaccuum tester and apply 20 - 30 inches vaccuum to c/cases
vaccuum should hold if not use crc or soapy water to find where uit is

a 2 stroke will exhibit symptoms such as ,revs out far too much ( lean ) overspeed -
very hard to start, or no start , run hot , have low power , stall if trying to idle or seem to raise their idle speed up and down , cannot get reliable hi / lo adjustments set on carb

2 strokes need air tight cases to create vacuum and pressure pulses to pump mixture to cylinder and to operate the carb fuel pump diaphrams


remember this F A C T S

F = Fuel

A = Air

C = Compression

T = Timming

S = Spark


cheers pauly 46
hope it helps

Apr 12, 2011 | ECHO, Inc. PB-251C Handheld Blower

2 Answers

Check engine light is on, they say multiple miss fire in cylcinder 6. but no one can find the problem van runs great


first do a cylinder compression test on engine to verify good engine compression this should be around 110psi to 175 psi check for vacuum leak, intake port for #6 cylindermay be leaking air, or also check coil for that cylinder, if wire and spark plug have already been changed, last replace fuel injector for that cylinder.

Jan 24, 2011 | 1996 Dodge Caravan

2 Answers

My tdr 125 has 30 psi compression measured on cold engine with carb. removed. It won't start at all. It has very good spark and fuel. thx


30 PSI IS NOT GOOD AT ALL. YOU NEED TO DO A LEAK DOWN TEST ON THE MACHINE TO DETERMINE WHERE YOU ARE LOSING COMPRESSION. IT COULD BE AS EASY AS A VALVE ADJUSTMENT OR IT COULD BE A BAD RING. YOU WILL BE ABLE TO HEAR WHERE THE LEAK IS BY LISTENING TO THE EXHAUST, CARB AND REMOVE THE OIL FILL PLUG AND YOU CAN FEEL THE AIR LEAKING . THE CARB OR EXHAUST IS MORE THAN LIKELY A VALVE PROBLEM POSSIBLY JUST ADJUSTMENT,. AIR FROM CRANKCASE IS RINGS.

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2 Answers

1982 yamha maxim 650 turns over but wont start battery is charged, turns over fine just wont fire up


you need to do basic diagnoses - 1 compression test,should be better than 130 lb and if in good order around 170 and all cyclinders within 14lb. 2 - check and make sure you have spark at all 4 spark plugs. 3- check and make sure you have fuel in carbies by undoing drain screw in each bowl, if above 3 all ok you probably have stale fuel and will need to remove carbs and clean out jets. this model also suffers from worn butterfly shaft through carbs which creates air leak and the manifolds to the head also leak and **** air.
0

Jul 20, 2010 | 1981 Yamaha XJ 650

3 Answers

Fzr 600 got killer spark pulls fuel valves in check wont start just turns over once in a while it while spit through the carbs or backfire through pipe few and far between carbs are clean plugs are new...


This is not the news you probably want to hear but backfiring thru the carbs when you have good spark can be one of 2 things... either the valves are sticking / not closing properly due to carbon or the cam timing has shifted from the original position.

It would be best to do a compression test. You should have a minimum of 100 PSIG for an engine with major problems and up to 150 for a healthy engine. If you can not get 100 PSIG then it will be time for some serious engine service.

There is a possibility of the kill switch wire in the handle bar grip grounding under the grip to the handlebar but, since you said you have killer spark I doubt this is your problem.

Thanks for using FixYa.

Kelly

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