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Old 04 October 2013, 11:46   #1
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Honda 90HP - Runnung Ruff..help req

Hi all, I have a Honda 90HP 2005 which I bought second hand and have no history to it. It was lying for 2 years. I sent the carbs away to a dealer to get serviced, when I pulled the leads off number 1 - no change in tone, then it fixed itself and was running fine. Went to it today and pulled the leads of 3 & 4 no change in tone ,Plugs were wet so was getting fuel. checked compression 180 180 180 190 in cylinders. There is sparks to all the leads. Do I need to balance the carbs would this help? , Or has anyone got any other suggestions as new to this. Also Tried to take lower unit off managed to get 5 bolts off but seems to be stuck? Cheers for your help anyone
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Old 04 October 2013, 11:53   #2
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For the LU: You need to pull the trim tab; usually a bolt hidden under that. If it's really corroded/salted up, you may need a bit of persuasion with a rubber mallet (be careful not to crack the anti-ventilation plate though.)

For the other stuff: Wet plugs on a 4-stroke? Sounds like you're not getting spark to the plugs (at least not at the right time.) Did someone mess with the timing belt and get stuff really screwed up?

jky
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Old 04 October 2013, 12:44   #3
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or start simple and make sure you got the right wire to the right plugs.
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Old 04 October 2013, 13:14   #4
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What's it like after it's warmed up a bit mine run a bit rough to start with Get the carbs balanced as well
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Old 04 October 2013, 13:45   #5
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i have a service manual for a carb'd 2001 BF90. I'm not sure what years the manual covers. I sold the boat so I don't have a use for it if you are interested. I can check years on it.
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Old 05 October 2013, 13:02   #6
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hi thanks for the replies. I started engine today it ran ruff for a while then started pulling the leads off 1,2,3,4 & the tone changed on all of them & left it ideling for 20 minutes so hope thats it fixed , but still cant get lower unit off. I got all the bolts out and its stuck on... its an extra long shaft - tried pizing it open & it just pulled itself close.....Anys suggestions again what am i doing wrong?
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Old 05 October 2013, 15:54   #7
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If the engine runs rough again check out the operation of the choke ie that the choke solenoid isn't sticking or that the manual choke isn't partially pulled.
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Old 08 October 2013, 02:55   #8
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is that castle bay on bara? stunning place.

oh re engine call 01475 744 215 ask for Cameron and he will sort you out.

Dave
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