Problem with full speed

[Matus]

Hello, I would like to know, what could be problem on my KAWI SXR 800 /factory wet pipe, flame arrestors/
When I'm run full speed for maybe 15-20 sec, the engine slow down and turn off. After that, I start normally, repeat it and had same issue.
Petrol is 2 weeks old, half of tank.
Today it was the first time, what it happends.
Does anyone have experience with this?
Thanx for answer

 

[vomitspot]

sounds like piston siezure

 

[SUPERJET-113]

Did you re-jet for the dry pipe?

 

[Matus]

Did you re-jet for the dry pipe?

No I didn't rejetting, got wet pipe.

 

[Matus]

sounds like piston siezure

Tomorrow try to measure the preassure on engine. I hope I will fix it, because I dont remember how much of gas I had today in tank when it happend. Try preassure, and if they be good fill up tank and full gas

 

[SUPERJET-113]

@Matus
Sorry, i meant wet pipe. When you put on a after market pipe you have to re jet the carbs. The pipe make much more power than the stock OEM exhaust pipe, yhus needing more fuel... You are having lean seizures and probably having some scoring now on your cylinder walls. Do not run it any more until re jet.

 

[Matus]

@Matus
Sorry, i meant wet pipe. When you put on a after market pipe you have to re jet the carbs. The pipe make much more power than the stock OEM exhaust pipe, yhus needing more fuel... You are having lean seizures and probably having some scoring now on your cylinder walls. Do not run it any more until re jet.

Thanx, maybe it was done, but I'm the second owner and don't know, what have been done.
Ok, how can I check it?

 

[Big Kahuna]

Did your replace the water fitting on the pump? If you bought the Factory Pipe new it would have come with a new 1/4 x 3/8 fitting. If you did not replace it then the motor can run hot and the over heat sensor would put you in limp mode until it cooled off..

 

[Matus]

Did your replace the water fitting on the pump? If you bought the Factory Pipe new it would have come with a new 1/4 x 3/8 fitting. If you did not replace it then the motor can run hot and the over heat sensor would put you in limp mode until it cooled off..

Yes I did. Must try preassure first, but here in Slovakia is 23:00 now, and can't go to try it now ;-)
And thanx

 

[Matus]

Hello,
Today I measured preasure. Both have 95 PSi, insert new NGK BR8ES spark plugs, check fuel tank if there is no some dirt, or stuff.
Ask the first owner if was rejet carbs - he said yes, they was modified.
Tomorrow wanna try on water with fresh water. Hope everything will be fine, and my problem, was only low fuel in tank.
Is anything what can I do or check?
Thanks friends

 

[Matus]

Thanx, maybe it was done, but I'm the second owner and don't know, what have been done.
Ok, how can I check it?

Thanx, maybe it was done, but I'm the second owner and don't know, what have been done.
Ok, how can I check it?

Hello,
Today I measured preasure. Both have 95 PSi, insert new NGK BR8ES spark plugs, check fuel tank if there is no some dirt, or stuff.
Ask the first owner if was rejet carbs - he said yes, they was modified.
Tomorrow wanna try on water with fresh water. Hopeeverything will be fine, and my problem, was only low fuel in tank.
Is anything what can I do or check?
Thanks friends

 

[Kohldanielzimmer]

If your compression is really 95 PSI, that is far too low. The consistency between the two cylinders may suggest a faulty gauge. Recheck with another gauge for good measure.

 

[Matus]

If your compression is really 95 PSI, that is far too low. The consistency between the two cylinders may suggest a faulty gauge. Recheck with another gauge for good measure.

Did you mean one more check with another gauge? Other type or so?

I found some vids and on one have spark in and than meassure, in other both sparks are out. I was measuring With spark plug in...

Thanx for help

 

[Big Kahuna]

You should test with plugs out. You should be around 175 lbs +/-

 

[Matus]

You should test with plugs out. You should be around 175 lbs +/-

OK, my preassure is low... I understand. What procedure should I choose next?

 

[Matus]

Have question, if I want to remove head - to check pistons etc, and after check everything looks fine, it is just to take it together again, or is necesary to change gasket, or and some lubricants or something when it put back? Thank you

 

[Ahmed AN9]

I think it's time to open the head and have a clear look at the piston wall. good luck

 

[Big Kahuna]

if your running a stock head, new gasket every time.

 

[Smokey72013]

I would get another compression tester reading before you pull your head. But if you already pulled it yes new gasket everytime.

 

[TylerRoberts]

I would get another compression tester read more on bestlawnmower2017.com before you pull your head. But if you already pulled it yes new gasket everytime.

Good idea!