Question about Polaris ATV

1 Answer

1999 Polaris scrambler piston melting

I am working an a 1999 polaris scrambler,I have replaced the piston 3 times and everytime the exhaust side of the piston melts, when I replace the piston i make some fuel adjustment,but nothing seems to make a difference,I also am not sure about the exhaust pipe it did have a hole in it which I welded.Is there such a thing that the exhaust does not have enough back pressure?

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hi Hpenner- We are a Napa store and garage, in Alberta, Canada, and we work on many brands and types of ATV's. First of all, is yours a two stroke or four? If it is a two stroke, does it have oil injection? You will need to make sure that is working (once you have it running)
1) what are you having done to the engine when you replace a piston, is it bored out with new rings, etc?
2) if it is a two stroke, the crank seals may need to be tested, they can fail, cause the engine to run lean and take out pistons like you are describing. The engine needs to be removed and taken to a reputable snowmobile or racing shop- they can seal all the ports, and there is an adapter that screws into the spark plug hole, then the engine can be pressure and vacuum tested. soap solution can be applied on the seals to see if they leak, in extreme cases we have submergred the engine in a water tank with 3-5 psi pressure to see where the leak is. It is a very simple problem, but very often overlooked, no one thinks of the seals, but the whole crankcase is essentially the intake, so it has to be sealed to run properly..

e-mail me back at bm-j1ac2k@shaw.ca

Posted on Jul 07, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Have a 2000 polaris scrambler 500 and only backfires and pops in reverse. drive has full powrer and starts great


your reverse over ride not working , u need to open switch box see if you have power to the switch when bike is running with a test light then with brake on and in reverse check the output wire to see if you have power out when depressed be sure you have the wheels up in the air when you do this for safety sake

Dec 31, 2016 | Polaris ATV

1 Answer

03 90cc polaris scrambler top end enter change with a 01 50cc polaris scrambler?


Hi ! for an informantion, please visit the website below. If you need more information about a specific electrical issue you can reach me at motor@motorpartstore.com
Motor Part Store Motor Parts Wholesale

May 06, 2016 | ATVs

1 Answer

What could cause a 2001 Polaris Scrambler 500 to overheat?


restricted water flow around the engine flush it out with a hose pipe

Mar 01, 2015 | Polaris 2011 Scrambler 500 4x4

1 Answer

Polaris Scrambler won't idle when moving


If a tune up doesn't help, rebuild the carb. the ethanol in gas ruins the gaskets.

Sep 08, 2014 | ATVs

1 Answer

I have eh 1989 trail boss 250 i have spark and just cleaned the carb but it still wont start so when i had the carb off i looked in side at the piston while i was rollin it over and it does look like...


I don't have a trial boss 250 but on most 2stroke engines you should never see the top of the piston through the intake port when the carb is removed as the piston doesn't go low enough, thats by design, its the exhaust side you need to look through to see the piston top(crown), if you remove the exhaust to have a look check the condition of the piston rings while there

Nov 26, 2017 | Polaris ATV

Not finding what you are looking for?
Polaris ATV Logo

Related Topics:

539 people viewed this question

Ask a Question

Usually answered in minutes!

Top Polaris ATVs Experts

john h

Level 3 Expert

14398 Answers

Matt Olenzek
Matt Olenzek

Level 2 Expert

297 Answers

Wade Mobley
Wade Mobley

Level 3 Expert

513 Answers

Are you a Polaris ATV Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...