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I have a 17.5 &s engine 274826 hard starting has compression…

i have a 17.5 b&s...
i have a 17.5 b&s engine 274826 hard starting has compression preventing the engine from turning over i adjusted valves to ,003 tdc on compression stroke, read about compression release on intec engine pulled engine split case no release and no bump on cam. re assembled re set valves still no turn engine starts and runs good of i cover intake of carb to get it to turn over. what do you think? thanks, Pete
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Answered in 8 minutes by:
11/21/2017
JON
JON, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1,851
Experience: Certified Small Engine Technician
Verified

Hi, my name is***** me review the issue, and I will be more than happy to help resolve it as quickly as possible. I will return in under 5 minutes

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va​lves should be set at 0.005. If you cover the intake on carb, the engine turns over, but will not even turn over without it covered ?

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Customer reply replied 7 months ago
No of course have to remove my hand to let it run

will it start without putting your hand over the intake

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Customer reply replied 7 months ago
No because the compression is too high
Customer reply replied 7 months ago
The engine rotates till it gets to the compression stroke then stops

sounds like the valves are out of adjustment, which at 0.003 they would be too tight. are both the intake and exhaust valves moving if you rotate the engine by hand

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Customer reply replied 7 months ago
valves are moving when turned by hand. If the valves are too tight wouldn’t it be easier to turn over?
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 31,407
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
Verified

What is full model number? The number you have does not show. It will be example(###) ###-####B1 . This is not intex OHV engine? Single cyinder?

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Customer reply replied 7 months ago
Ybsxs.5012vb

That is a family number, not the model, See example.

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I see the question is still open???

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Customer reply replied 7 months ago
3g777.0165e1. Code 0z6za is on the valve cover is this the one

31G777-0165-E1 is the model, it is an Intex engine. See parts list in the link below.

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What is the compression? If it is over 100 psi, the internal compression release, which is on the back side of the camshaft gear is broken. This causes the engine to be too hard to crank, and the only repair is to replace the camshaft. !!!

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Customer reply replied 7 months ago
I’ve read on the compression release on the cam and split the case it just a regular cam two lobes and no compression assembly.

Then it is missing, see link of the camshaft. This is your number.

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Ask Your Own Small Engine Question

793880

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Customer reply replied 7 months ago
Ordered new cam will info in about a week. I received this mower from a questionable mechanic which would explain he slow turnover when starting

I think the new cam will take care of it. It has to have the weight!

Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 31,407
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
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