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Old 01-25-2013, 08:36 PM   #1 (permalink)
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1987 trx 250x issues

Hi
I am new to this forum, but not to quads. I have several others, but just picked up my first Honda last week. It is a 1987 trx 250x. It came with new tires, good plastics, g-force axle and DG exhaust (stupid loud) for $300. The former owner could not get it to run. I bought it, brought it home and with a little tinkering (adjusting the valves to spec)and cleaning, I got it to start (rough at first) and then was able to ride it. My problem now is that it won't stay running. It has great spark, new gas, I have totally cleaned the carb twice, new jets upped the main to a 130 and the pilot to 40. It is total bear to kick over. I see that the decompressor cable is attached to the head, but the bracket in front of the cam follower shaft is missing so I can't adjust the decompressor. It appears the motor may have been rebuilt not too long ago, or at least taken apart, because there are new gaskets throughout.
Now when I try to start it, it will fire briefly on the third or fourth kick, then die. There is fuel in the bowl, but when I pull the plug it appears dry. I have used two cans of carb cleaner to clean out all of the ports and crevices of the carb body. I adjusted the air/fuel mixture screw out to 2 1/2 turns to start. I can't figure out what else it could be. Could it be out of time? The T mark did not line up to the timing mark when I went to adjust the valves again. I am at a loss. Would not having the baffle on the main jet cause issues like this. When I pulled the carb apart I saw that mine was missing. Thank you in advance for any guidance you can give. I have been researching the forums to find the answers myself but am coming up without any fresh ideas. Thanks
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Old 01-26-2013, 08:47 AM   #2 (permalink)
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Also have installed new plug. When I went to adjust valves the flywheel kept lining up on f mark, not the t. Is there anyway to adjust the float on these carbs? Thanks
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Old 01-26-2013, 08:55 AM   #3 (permalink)
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welcome to the forums. no way to adjust the float. if you take a pull bar and a 17mm you can hold the flywheel on the "T" make sure you are adjusting on the compression stroke too. try that and get back to us
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"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
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Old 01-26-2013, 09:20 AM   #4 (permalink)
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Thank you! That is what I ended up doing yesterday. I re-adjusted again just to make sure.
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Old 01-26-2013, 11:00 AM   #5 (permalink)
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The decompression needs the.bracket to be properly adjusted but that shouldn't affect it running? I've heard if it being deleted. I think your issue is in the idle circuit if you didn't remove the fuel screw and clean the orfices related to that area then you are shooting yourself in the foot. You need to remove the carb and dissemble it completely removing all the o-rings spray it out really good and blue out out with compressed air.
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"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
74' CB360 (future FrankenQuad)
Work in progress

JETTING

MOOSE_WAGON_makeover

2000_Rancher_build
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Old 01-26-2013, 11:47 AM   #6 (permalink)
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I have all broken down again. I will boil it for a bit and then blow it out. Hopefully that will dislodge anything still hanging up in there. I will let you know how this shakes out. Thanks for your help
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Old 01-26-2013, 04:31 PM   #7 (permalink)
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Put some lemon juice in the water
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"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
74' CB360 (future FrankenQuad)
Work in progress

JETTING

MOOSE_WAGON_makeover

2000_Rancher_build
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Old 01-26-2013, 10:02 PM   #8 (permalink)
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I did just that. I boiled it for about three hours, lots of crap floating in the water after. I was amazed especially because I had used two cans of carb cleaner before. After boiling it I blew it out with the air compressor. Hopefully this will do the trick. I am hunting tomorrow, so hopefully Monday I can get it put back together and see if I got it clean. I really am looking forward to riding it. Kickstarting sucks though, I have been spoiled with mt kfx400!
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Old 01-26-2013, 10:55 PM   #9 (permalink)
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dd you do a compression test?
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Old 01-27-2013, 05:42 AM   #10 (permalink)
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Quote:
Originally Posted by rem28ga View Post
I did just that. I boiled it for about three hours, lots of crap floating in the water after. I was amazed especially because I had used two cans of carb cleaner before. After boiling it I blew it out with the air compressor. Hopefully this will do the trick. I am hunting tomorrow, so hopefully Monday I can get it put back together and see if I got it clean. I really am looking forward to riding it. Kickstarting sucks though, I have been spoiled with mt kfx400!
The acid in the lemon juice breaks down the contaminates. Personally I use a small HVLP gun filled with Laquer Thinner turn the spray pattern to a point and let her rip plus makes the carb look newer. lol
__________________
"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
74' CB360 (future FrankenQuad)
Work in progress

JETTING

MOOSE_WAGON_makeover

2000_Rancher_build
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