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Okay I have a 1986 Yamaha maxim 700 I've been

Okay I have a 1986 Yamaha maxim 700 I've been working on it all winter and I've got it sort of running my main problem im having is it doesn't always start on the first try, it will just keep cranking and cranking What do you think the problem could be I've cleaned the carb and rebuilt it mostly, all the fuel lines are new rebuilt the petcock new spark plugs Could it be I just need to let itself run for a few hours

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  • Expert
  • 314 Answers

Cant work on these rate for solution

Posted on Jan 17, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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tabbycat282
  • 56 Answers

SOURCE: 1989 tw200 yamaha won't start

G'day egdbcs . Ok.now lets see.You say good spark,so i'm presuming you are doing the old sight test.Try bending the arm on a know good sparkplug about 5-6mm,earth the plug and kick'er in the guts(crank it over)Be very carefull , high voltage danger.If there's still a good spark it's safe to say that there will also be a good spark under pressure in the combustion chamber,speaking of which you should also do a compression test,anything over 100psi should be ok. as i'm not to sure of the extent of the re-build,hopefully the valves were lapped and checked for straight and true and valve seals replaced,if you notice oil on the tip of the spark plug you could have a leaking valve seal or oil seal .Try putting a small amount of fuel directly into the combustion chamber ,tighten up the spark plug ,install the plug cap and.......Yeah ..You guessed it ..."kicker in the guts".If all the abouve are correct and true it should fire up.If it runs for 5-10 seconds then stops you've got some sort of fuel starvation problem , could be dirt in the carb,blocked idle jet ,or air passage or even the needle could have come off it's clip,believe me with an old bike like yours anything could be worn and loose inside that carby.The only other thing to consider is the timing.There may be a good spark but is it happening at the right time inside the engine???. I'll leave it all in your capable hands EGDBCS.Hope this helps to solving your worries. Chow for now......Tilleydog..

Posted on Jun 03, 2009

holmestead
  • 5 Answers

SOURCE: Will not run without choke

have you checked for vaccuum leaks at the intake manifold? you can check by pouring water over the gasket area when/ if you get it running!

Posted on Jun 14, 2009

  • 8 Answers

SOURCE: 1985 Yamaha xj700 Maxim- Carb. fuel lines

yes, the breather line hooks to the petcock on the line facing the back, the fuel line hooks to the larger one. the line from the breather is actually a vacume line that turns on the fuel, without it you will not get fuel out of the petcock unless it is in the prime position.

Posted on Jul 04, 2009

bazzz7071
  • 342 Answers

SOURCE: 79 yamaha XS 750 crank no start

well here goes your problem probably in the float bowl area water sediment blocked low speed jets if you do not want to do a complete tearmore down just clean the jets and float bowl.
Use a carb cleaner soak the jets make sure you can see through them the small low speed jets specially.
if you have access to air blow the jets clean.
spray any passage ways with carb cleaner reassemble good luck.

Posted on May 07, 2010

heimlich
  • 1978 Answers

SOURCE: I have a yamaha

Check that the intake manifold is not cracked or separated, extra air might cause you to need the choke. Some times the first carburetor cleaning does not do the trick. Take the carburetor off again, take out the slow jet, and shoot through it with cleaner to make sure it is clear. Now shoot through the passageway of the body and make sure that the body of the carburetor is clear . When all passageways in the body are clear then reassemble and put it back on. If the air screw is set correctly you should have a machine that idles.

Posted on Sep 09, 2010

Testimonial: "Thank you very much Heimlich. that should do the trick. "

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