Bike wont start after sits for a bit after very long rides.

I have an 82 xj750 maxim its been great so far no real issues to deal with. have done all the basic within the last 1000 miles,
-oil and oil filter done
-new Air filter
-checked valves
-floats are all done and synced.
-break fluid was done.

will be replacing the break pads for all the breaks even though there ok as of now including the back one which got checked out right away to make sure it was ok. and will be replacing the break lines soon. So now that i've said what is done to it. here is the issue

I drive an 1 1/2hr one way to school and work everyday of the week. when i get back home from either and have been riding all day i pull into the garage and stop the bike but if i wait more than 20-25min to start it again it takes a lot of cranking to get it to go. is this typical of these bikes it just seems really hot to me. A lot of heat does come off of the fins and engine block but the oil is new and correct amount in it.
Any help and ideas would be great thanks guys.
-Also my bike squeaks a lot while backing up its seems to be from the front breaks but i have checked them out and there at a good level and i cant find why they do it while backing up but not going forward. thanks.

 

not sure on the brake. next time it won't start try putting the petcock on prime for a couple of seconds then try to start it.

 

About that petcock, wish there was a turn off direction. :?

 

"About that petcock, wish there was a turn off direction."


On and reserve are the "turn off" directions. They are a vacuum operated item - ie only flow when motor running. If yours is leaking at rest you have a faulty petcock and one or more floats are sticking.

Archangel14

You need to disassemble your calipers and clean them.

 

RE: petcocks; EXACTLY. If it passes fuel in "ON" or "RES" with the bike off (no vacuum signal) it has a problem.

As for starting the bike after it's been off for that long, give it some "choke" (enrichening circuit) for just a sec until it fires.

More like rebuild them. (Common symptom.)

And check the date codes on those lines: http://xjbikes.com/Forums/viewtopic/t=41400.html

 

hey thanks guys Big i plan on getting the stainless ones its been on my list but it got bumped due to rent and stuff. but i want to do a full break rebuild during the off months coming soon. and i will have a bit more money once i start my new job. SO i will use the choke a little when it sat after a long ride. i was surprised cause the engine is always still very warm and once it starts it idles very well like its fully warmed up. Thanks again guys.

 

This isn't an "on the list" thing, you have the beginnings of a deadly problem.

The brake symptoms indicate that the calipers are not releasing fully; the brakes are dragging.

This will get worse, and will lead to overheating, which can warp your rotors. (Making the repairs a lot more expensive.)

It can even cause the front brake to lock up on you.

This is not something that you should put off, it can quite literally kill you. Quit riding the bike until you can afford to fix the brakes. You can't afford NOT TO. The potential consequences are a lot less affordable.

 

Yeah, about this topic; I have struggled with this issue too sometimes and was hesitant to ask since I figured something would be wrong with my bike only. Glad to hear this isn't just a one-man's problem or gremlin but I'm curious as to WHY this happens. :? I've gotten an appreciative mindset for the engineers who made our UJMs but sometimes little stuff like this makes me wonder. Anybody know enough science to understand what's going on here?

(...yeah, the engineering side of me is kickin gears this morning which is unusual for a Friday! :lol: )

 

Re: Bike wont start after sits for a bit after very long rid

My bike has the same problem, it's common to all carb'ed engines and is known as either a temperature induced flood or it could be a vapor lock. In either case the solution is to hold the throttle wide up during cranking to blow out the excess fuel. It'll fire up and you'll smell all the nice rich unburned fuel out the exhaust.