All-Road 250cc -> Carb Rejet -> Bogging Down -> Shu
 

Hi All,

I have recently rejetted the Carb on my AllRoad 250cc Dirt bike. the bike wont start unless I spray starter fluid into air filter. After starter fluid the bike starts but after it warms up it will bog down and quit. It wont start again until I use starter fluid. Do I have to adjust the Valve's on the bike. This is about the only thing I haven't done.

The bike has redneck air filter and PowerCore FMF exhaust. Do you all have any suggestions/solutions on how to remedy this issue??? Thanks


Michael A

couple of things i (we) need to know did it have the issue before you jetted my guess is a little something got into the jets if this just started as for the valve adjustment if it ran before fix the problem at hand first good luck :lol:

same before jetting
 

Yes,

It had the same issue "before" I rejetted carb. Any suggestions? Thanks

if the bike has a few hours on it a valve adjustment could help as the valves wear the clearance gets smaller .002 isnt much anyhow and it may be holding a valve open but you can check this by seeing if our compression is low without tools you can still tell by using you finger in the plug hole if compression is good i would look to a float adjustment sound mostly like its starving fo fuel maybe even the tank vent blocked

compression??
 

I just brought a compression tester today to test on a buggy I have. What should the compression range be for the dirt bike???

Also, do you think I should bother with the valves at all? I bought a metric fueler gauge just in case. The Gas tank vent shouldn't be blocked because I can visually see fuel coming out of the tank because I have a clear gas tube from the gas tank. What is a Float Adjustment entail??

I really need to get this bike running now because Honda didn't approve me for a loan for a new dirt bike. I will stick to chinese bikes.

just a guess but i would like to see something around 100 lbs on compression if is the valves it would read 30-40 maybe 0
for the fuel cap vent you can just take the cap off from what your describing it sounds like fuel i have said this before, get the bike running with the air cleaner off rev it up then take you hand and smack it over the opening where the air filter was this takes a few trys but you want the engine to suck the jets clear using the vaccum of the engine trust me sometimes this works and its easy worst case you may foul a plug once you get it running ill give you more tips like a better fuel filter and my favorite av gas :wink:

i'll give a try
 

Thanks man. I will give all of these suggestions a try.


Michael A

Compression
 

I did a compression test on the bike and it read 120. I don't know what else to do. To refresh: I have a open cone air filter, fmf powercore 4 exhaust and new mikuni 30mm carb with 125 main jet and 45 pilot jet. The bike start with starter fluid and when it warms up a little, when I rev it, it bogs out and dies. This is a AllRoad DB-27A Dirt Bike. I have rode it hard.

I am going to purchase a CMS 250 xmoto dirt bike this week from countrymotorsports.com but i won't sleep well at night until I fix my AllRoadDB-27 Dirt Bike. Thanks for all your help dudes. seriously.


Michael A

What does the spark plug look like?
is it wet, dry, white, black, tan ????

Have you checked the fuel flow to the carb?
shut the fuel off pull the fuel hose off at the carb and then let the fuel run into a clean glass jar for a minute or so and see if it slows or stops.

If that is fine then check the carb, the float needle and float level.

have you checked the wiring, spark plug lead and stuff.
I had a snowmobile that ran great at idle to mid range but cut out at top end and it was just a wire grounding out.

Is the choke working right?
does it have a compression release?

It really sounds like you are not getting any fuel. If you need to spray starting fluid in it to get it started and then it won't rev after you get it running really sounds like a fuel starvation problem.

I would check for fuel flow from the tank first. Remove the fuel line at the carb and get a glass jar and then let it run into the jar to verify that you have fuel from the tank. Let it run it for a few minutes at least to make sure the tank vent it working.

If that tests out then move to the carb. Take the bowl off and verify that the float is working and that the needle valve it opening up to let fuel in. It may be that the float is set too low and keeping the valve shut all the time.

Allen

I concur...fuel starve.

wow
 

Well, I took the Spark Plug out last night and it is "black".

The Mikuni Carb is new and when I rejetted it the needle, float and choke all functioned ok from looking inside.

I have a new NKG wire to spark plug.

What is a Compression Release?

I will check fuel flow from the tank again. Thanks for all your help dudes.


Michael A

dont worry i doubt you would have one (compression release) have you tried smacking you hand over where the air filter goes

not yet
 

I will give it a try covering air filter hole.

If the spark plug is black, sooty black then it is running to rich and you'll need to lean it out.

try a main jet in the 110-115 range.
You may want to try a smaller pilot jet as well.

Is there much of a difference whether the choke is open or closed on how it starts ?