help this mojave
Nov 1, 2000 | 08:48 PM
#1
Thread Starter
|
Weekend Warrior
Joined: Oct 1999
Posts: 21
Likes: 0
ok this mojave i have is biggest piece of **** i have ever seen its a 98 and rod broke and screwed everything so i got another used motor but put a new wiseco piston in and webb cams'
problem is first day of riding time i was riding and it cut off like it was outta gas and wouldnt crank back
i put new plug in and still wont start i toojk plug out to see if it was getting spark and it is but when u kick it over it dont try to fire whats the deal?
i checked timing it was good
so is it valves bent or carb?
thanx
problem is first day of riding time i was riding and it cut off like it was outta gas and wouldnt crank back
i put new plug in and still wont start i toojk plug out to see if it was getting spark and it is but when u kick it over it dont try to fire whats the deal?
i checked timing it was good
so is it valves bent or carb?
thanx
Nov 2, 2000 | 01:52 PM
#2
Range Rover
Joined: Oct 2000
Posts: 107
Likes: 0
same thing happened to mine last week I dont know how to fix it thats why my post is right under yours.Hope someone can help us I agree they are crappy bikes everything broke on mine too like $1500 in fixes so far. Soon as it gets running I am selling it for a 300EX I do think it is the valves though but I dont have a book on it to know what the settings and clearance are Mojaveaddict would know he knows alot about them he will probably respond next time he comes online.
89 Mojave
89 Mojave
Nov 2, 2000 | 03:53 PM
#3
Pro Rider
Joined: May 2000
Posts: 611
Likes: 0
ncmojave250 and hondabigred
I'll try to help you guys out but it is very difficult to diagnose a problem like this through email because there is not a lot to go on. But I'll give info that should help.
hondabigred, about your other post on valve adjustment, here are the specs and procedure. But it is unlikely that valve adjustment will fix a no start condition unless the valves are cupping and sucking up in the head. If this is the case there will be no clearance at all when you check it.
Specs - Intake .008" Exhaust .010"
Procedure-
1. engine must be cold
2.Remove the valve cover and whatever you have to take off to get it off
3.remove plug on magneto cover to see the timing marks and line up on TDC with ALL VALVES CLOSED
4.measure the clearance of all valves between the adjusting scew and valve stem.
loosen lock nut and turn adjusting screw to set clearance if it is not right. tighten nut and recheck.
5.put everything back together
In order to start there must be four things that are ok.
1. good spark
2. fuel mixture
3. everything in time
4. good compression
First check the spark. To do this plug a new or clean spark plug into the plug wire. Connect a jumper wire from the threaded part of the plug to a point on the engine that you know is a good ground (clean metal, no paint or dirt). Have some else kick the motor over with the switch on while you watch the plug gap for a good spark.
If the spark is good make sure the carb is getting plenty off fuel. I have had two cases where the filter in the tank was restricting fuel flow because the screen was stopped up. to check this remove the fuel cut of valve (2 screws) and check the screen on it. If in dought remove the screen totally and put the valve back in. Then put an inline filter in the hose from the valve to the carb. If you take the air box off and look into the carb you should be able to see some fuel mist entering the engine while it is kicked over. if not sure spray a "Small" amount of starter fluid in just to see if it will hit a lick. If it does then fuel is the most likely problem. you may then want to remove the carb and check into it.
If spark and fuel seem ok then check the compression with a compression gauge. I dont have my shop manual here right now to look up the min spec but you should have at least 100 pounds and really should have more. I'll look it up later when i get home to my manual.
Low compression could be caused by a number of things like bad valves, rings, scored cylinder wall, and bad piston, or the cams could be out of time.
It's really hard to explain the cam timing check without pictures. If you guys have a fax number you can give me I will fax you a copy of how to check the cam timing.
ncmojave, if you went with a large cam you will have to do some jetting work and probably set the idle higher than normal. The larger the cam the harder it is to get the low end right. If you have an all around cam this wont be that much of a problem. You also need some stronger valve springs unless the cam is a mild one. But if you have cupping valves stronger springs will make it worse. You need to fix them if that is the case though. I here a lot about the intake valves cupping in mojaves but i have never seen it happen myself. I used to replace the valves with stainless steel ones on an overhaul just to be safe but now i use the Vesra replacements and have no trouble.
I have seen one mojave that the valve keeper came off. it let the valve fall and bent the valve. This motor had been run with way to much valve clearance cuasing this problem.
check the four things you need to start and see what you find. post results if you dont find the problem and we can go from there. Also get a real shop manual from the kawie dealer if you plan to work on the bike yourself. They cost about 30 bucks but it is worth it.
I'll try to help you guys out but it is very difficult to diagnose a problem like this through email because there is not a lot to go on. But I'll give info that should help.
hondabigred, about your other post on valve adjustment, here are the specs and procedure. But it is unlikely that valve adjustment will fix a no start condition unless the valves are cupping and sucking up in the head. If this is the case there will be no clearance at all when you check it.
Specs - Intake .008" Exhaust .010"
Procedure-
1. engine must be cold
2.Remove the valve cover and whatever you have to take off to get it off
3.remove plug on magneto cover to see the timing marks and line up on TDC with ALL VALVES CLOSED
4.measure the clearance of all valves between the adjusting scew and valve stem.
loosen lock nut and turn adjusting screw to set clearance if it is not right. tighten nut and recheck.
5.put everything back together
In order to start there must be four things that are ok.
1. good spark
2. fuel mixture
3. everything in time
4. good compression
First check the spark. To do this plug a new or clean spark plug into the plug wire. Connect a jumper wire from the threaded part of the plug to a point on the engine that you know is a good ground (clean metal, no paint or dirt). Have some else kick the motor over with the switch on while you watch the plug gap for a good spark.
If the spark is good make sure the carb is getting plenty off fuel. I have had two cases where the filter in the tank was restricting fuel flow because the screen was stopped up. to check this remove the fuel cut of valve (2 screws) and check the screen on it. If in dought remove the screen totally and put the valve back in. Then put an inline filter in the hose from the valve to the carb. If you take the air box off and look into the carb you should be able to see some fuel mist entering the engine while it is kicked over. if not sure spray a "Small" amount of starter fluid in just to see if it will hit a lick. If it does then fuel is the most likely problem. you may then want to remove the carb and check into it.
If spark and fuel seem ok then check the compression with a compression gauge. I dont have my shop manual here right now to look up the min spec but you should have at least 100 pounds and really should have more. I'll look it up later when i get home to my manual.
Low compression could be caused by a number of things like bad valves, rings, scored cylinder wall, and bad piston, or the cams could be out of time.
It's really hard to explain the cam timing check without pictures. If you guys have a fax number you can give me I will fax you a copy of how to check the cam timing.
ncmojave, if you went with a large cam you will have to do some jetting work and probably set the idle higher than normal. The larger the cam the harder it is to get the low end right. If you have an all around cam this wont be that much of a problem. You also need some stronger valve springs unless the cam is a mild one. But if you have cupping valves stronger springs will make it worse. You need to fix them if that is the case though. I here a lot about the intake valves cupping in mojaves but i have never seen it happen myself. I used to replace the valves with stainless steel ones on an overhaul just to be safe but now i use the Vesra replacements and have no trouble.
I have seen one mojave that the valve keeper came off. it let the valve fall and bent the valve. This motor had been run with way to much valve clearance cuasing this problem.
check the four things you need to start and see what you find. post results if you dont find the problem and we can go from there. Also get a real shop manual from the kawie dealer if you plan to work on the bike yourself. They cost about 30 bucks but it is worth it.
Nov 2, 2000 | 07:11 PM
#4
Range Rover
Joined: Oct 2000
Posts: 107
Likes: 0
thanks alot mojaveaddict I am going to try this also today I got my mojave running for a minute after many kicks but to keep it running I had to keep on the gas and as soon as I let off the gas it stalled and wouldnt start again I do know that the compression is good it is the same as it always was I put in a brand new champion #809 plug and lost all compression but it said it is the right plug but as soon as I put the ngk back in all the compression was back. also you were right a mojave does have more power over a 300EX I just took one for a ride today from the dealer and It was underpowered compared to my mojave but that electric start was sure nice now I am going to concentrate on fixing this bike without taking it to a dealer and keep it.
Thanks alot I hope it works!!!!!!!
Thanks alot I hope it works!!!!!!!
Nov 3, 2000 | 10:43 AM
#5
Pro Rider
Joined: May 2000
Posts: 611
Likes: 0
hondabigred, sounds like you have a carb problem or a possible fuel flow problem. Check fuel delivery to the carb first. If ok then take the carb off and check the diaphram - hold the slide open and then let it go, it should return slowly. If it slams shut fast then the diaphram is bad. I hope not, that thing cost about a 100 bucks from kawi and I dont know where else to get one. I once bought a whole used carb instead to save money when I
needed one. If the diaphram is ok then take the carb apart and clean it very good. make sure all passages are clean by spraying carb cleaner through them and watching for it to come out the other end. Check the float and the needle and seat assy. while your in there.
needed one. If the diaphram is ok then take the carb apart and clean it very good. make sure all passages are clean by spraying carb cleaner through them and watching for it to come out the other end. Check the float and the needle and seat assy. while your in there.
Nov 4, 2000 | 02:28 PM
#6
Thread Starter
|
Weekend Warrior
Joined: Oct 1999
Posts: 21
Likes: 0
ok i cleaned my carb and it didnt help a thing mine has new needle and seat and nothing wrong with carb im really starting to get pissed now
it sounds almost like the head pipe is off while trying to crank it like its sucking air or something i noticed it was leaking a lil oil around both side case gaskets the other day while riding it has only been rode a hour on tthis new piston and stuff could piston be screwed up?
98 mojave for sale
it sounds almost like the head pipe is off while trying to crank it like its sucking air or something i noticed it was leaking a lil oil around both side case gaskets the other day while riding it has only been rode a hour on tthis new piston and stuff could piston be screwed up?
98 mojave for sale
Nov 4, 2000 | 03:32 PM
#7
Trailblazer
Joined: Jul 1999
Posts: 46
Likes: 0
look and see if your carb is on my 2000 did that so i was driving like 5 miles home throw the trail at like 50 but any how check and make shure its got a good clean fit on the carb and the manifold
Sean
2000 mijave 13t sidewinder 22" bandits
97 xr 440 to much to list
Sean
2000 mijave 13t sidewinder 22" bandits
97 xr 440 to much to list
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Nov 5, 2000 | 10:49 AM
#8
Range Rover
Joined: Oct 2000
Posts: 107
Likes: 0
Hey Mojaveaddict I got my mojave fixed on saturday I took all the plastic off of it and started messing around when my neighbor saw me he knows alot about bikes so he came up and asked what was a matter I told him what happened so he told me to take it to his garadge and he would have a look at it so I pushed it down there and when I got it down there I told him that I am going to go home and eat lunch so I walked back up to my house and before I even got my sandwich made he was knocking at my door telling me to come and get it.he fixed it in like 2 minutes the problem was the spark plug wire wasnt on tight he said it wasnt in good shape and kept braking loose he said that when he took it off to see if it had spark it fell off on him I didnt think of that I just put a new plug in and assumed it was getting spark had no one to help me. so he put a new one on and took off the breather that comes out of the bottom of the airbox and goes into the top of the motor and sprayed some starter fluid down in there and it started first kick. Now it starts 1st kick everytime its pretty nice also ncmojave I know what you mean the rubber boots around the carb are extremely difficult to get on I left out the bolt that is on the throttle side of the airbox that the bolt goes through like a tube and then into the airbox and then they fit just good but to be safe I put some RTV sealant on it to be safe.Thanks alot Mojaveaddict for all your advice I really appreciate it!!!!!!!!
89 Mojave works better than ever
84 ATC200M
89 Mojave works better than ever
84 ATC200M
Nov 6, 2000 | 11:01 AM
#9
Pro Rider
Joined: May 2000
Posts: 611
Likes: 0
Glad you got your mojo running hondabigred. I haven't seen a plug wire like that on a mojo yet but that is about the best and easiest fix it could have been. now get out and ride! have fun!
ncmojave, your description sounds like you you have compression in the crankcase or through the intake or something. Check the compression. Also pull the 5/8" hose off that comes out of the top of the case back over the trans area and goes into the bottom of the air box. Hold your finger over the opening in the case and have someone kick it over, if there is a lot of pressure there your piston or rings could be bad. Also make sure your valves are not too tight. If they were not set correctly when the work was done the compression could be going into the carb or exhaust because they are too tight to close all the way. By the way, compression blowing by the rings into the case can make oil leaks from almost everywhere around the case.
ncmojave, your description sounds like you you have compression in the crankcase or through the intake or something. Check the compression. Also pull the 5/8" hose off that comes out of the top of the case back over the trans area and goes into the bottom of the air box. Hold your finger over the opening in the case and have someone kick it over, if there is a lot of pressure there your piston or rings could be bad. Also make sure your valves are not too tight. If they were not set correctly when the work was done the compression could be going into the carb or exhaust because they are too tight to close all the way. By the way, compression blowing by the rings into the case can make oil leaks from almost everywhere around the case.
