1988 SE 1500 Carburettor question - fuel lines


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Aussie81Interstate
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1988 SE 1500 Carburettor question - fuel lines

Postby Aussie81Interstate » Thu Sep 17, 2015 3:34 am



Hi guys,

My wing is going in for a new tire on Monday and getting fresh oil in the front forks.

I have a few questions so I can ask the mechanic the right questions.

Question 1:
The bike has at last service (we ran out of time to pull the carbs off) a fuel smell which is quite strong - and we know it is leaking but seems very difficult to fix with the carbs on the bike - and we have discovered there is a small leak coming from the front of the carbs (old hose/s seems to be wet), (front wheel side), but unable to determine what the lines on the front side plug into. Does anyone have a photo of the front of the carbs and the hoses going into them and able to describe what each one is for? We were going to take the carbs off - or is it possible to replace all these hoses with the carbs in place, as this would obviously save me time and money if there is no need to remove them. Plus my fuel economy is very low - so I need to fix it.

Question 2:
After removal of the front wheel is there a drain bolt in the front forks?. Can I just loosen the top triple clamp bolts, and then release the fork caps (with great care of course) to refill them?

Question 3:
There is a lot of movement in the front forks - when I grab the front brake I can compress the forks down about 4" quite easily and bike has a harsh ride at the moment (any small hole in the road gives feedback through the bars) - so I presume I could be bottoming out, have no fork oil or very little, have an old front tire which has gone hard (likely) or too much tyre pressure, or a combination of all the above? any thoughts ?

thanks for your responses in advance

Charlie :)



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RBGERSON
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby RBGERSON » Thu Sep 17, 2015 4:30 am

If the leak is from lines the carbs have to come off to repair..IMHO

Should be a drain on the forks..can't just fill from the top as you have know way knowing how much is already in the forks.

You could have bad springs, little oil, no air or all three..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

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RB

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dingdong
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby dingdong » Thu Sep 17, 2015 7:41 am

At the bottom of the anti-dive unit (lower rear of the forks just above the axle, the brake caliper attaches to it) there is a drain bolt for draining the forks. After draining then yes you refill from the top.
Tom

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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby virgilmobile » Thu Sep 17, 2015 10:12 am

You can refill from the top "if" the cap has a hole to get the oil in.My 88 did not.I had to remove the top cap and drill/tap a hole in it.Then comes the job of compressing the spring to get the cap screwed back on.
I did try every method of replacing the oil like I did on the other wings.it did not work.

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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby spiralout » Thu Sep 17, 2015 12:40 pm

You have no fuel lines on the front side of the carbs. There are 3 vacuum lines, two from the CAJ valves at the top of the carbs and the one that comes off the lower left and T's to the airbox. The two large hose barbs at the bottom are for the coolant hoses. Could be a bad bowl gasket.

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Aussie81Interstate
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby Aussie81Interstate » Thu Sep 17, 2015 4:08 pm

Thanks for all the replies, the picture and the information

Further questions
What are CAJ valves ?
The vacuum lines are where I think the lines are damp - there is a concertina style rubber cover over a section here?
If there is a bad float bowl gasket - are they able to be sealed from the outside - or recommend to replace?


Thanks

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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby n5926g » Sun Sep 20, 2015 7:27 am

If its the bowl gaskets,the carbs have to be removed,and the units separated.Also...there is a "hard line" that has a very small O ring that go,s from the base of the carbs to the accelerator pump nozzles on the top....This O ring could be where you leak is coming from,When removing this line,be careful to observe top and bottom....There is a one way valve in there! :o

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Aussie81Interstate
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby Aussie81Interstate » Mon Sep 21, 2015 2:18 am

A very long day today, up early and a 40 mile ride up to the mechanics. Arrived at 9:00am, and the bike went straight on the hoist, so it wasn't long before the front tyre was changed, and balanced (did not need any weights). The old tyre was more than 8 years old and very hard, plus the tread on one side was starting to deteriorate, and the middle of the tread had worn sort of into a flat spot. After this was done, the front fork drain bolt was undone on the left side - and then the top removed - the springs are fine the top spring popped out of the top of the fork about 4 inches, and quite forcefully as well. When finally drained the fork oil was measured to be approximately 250ml or cc, so well short of what should have been in there. Flushed out and refilled with about 330ml of 20wt oil. Did the right front fork - it had a similar amount of oil, but had an issue getting the cap back in - it took about 6 goes before it decided to take - with me using my weight as leverage behind the mechanics shoulder, needless to say he was very happy it went back in as there was some ripe language being used.
Ok tyre back on - all bolted up all looking good.
Time approximately 11:00am

Now on to the smelly carbs. Tupperware off - at least 30 minutes. Then start by removing the air cleaner, disconnecting most of the vacuum tubes, taking a few photos as we went to make sure all the hoses went back the same way. Decision was made to take them off instead of trying to work around them - off by 12:30 - lunch time.
Back at it by 1:00pm, carbs off and separated.
Carbs were fully stripped, and cleaned internally and externally, all jets removed and slides and diaphragms removed.

We are sure we found where the leak was coming from - two areas - one was the T junction from the fuel inlet, the second was from the accelerator pump - even though this was checked previously - it was decided the old ones were quite hard and not an overly firm fit - so off to the local "O" ring merchant - 50 metres away and for the grand sum of $1.50 had the required "O" rings. Reinstalled them, and reassembled. All the jets were clear and no sediment at all in the float bowls. The float bowl "sealing rings" were quite hard - but I had not received the replacements I had ordered quite some time ago - so we had to settle for removing the old ones with a pick, cleaning out the channels and then using the smallest amount of RTV to reassemble under and over the sealing rings. By the time the carbs were put back together, the RTV would have gone off- and the stuff used is impervious to oil and fuel.

Reassembling the carbs was relatively simple, and reinstalling was again quite simple. The only issue found was the idle mixture screw caps - we ground the tab off one side --but forgot the other - so after the carbs were on the bike it was too hard to set one of the screws - out with the trusty dremel - and we took the edge off. Then getting the right screwdriver to fit was also a PITA.

Got the bike up to temperature - balanced them first, then set the mixture scres (they were both 4 1/2 turns out) reset back to 2 turns out for starters then they finished about 3. Idle adjustments done, and another final balance - amazing how the bike sounds now - and it idles smoothly at 500 rpm.

Now 3pm and finished putting the tupperware back on - the mechanic took it for a quick squirt around the block, and came back happy.

After a quick chin wag I left for home - and got a fair bit of traffic, posted speed limits are not more than 80km/h, and the bike is completely different.

No more nose diving when you pull the front brake - no great front end noises, the bike tracks differently and feels so much more powerful.

And last but not least - no more fuel smell (touch wood).

Looking forward to some better fuel economy. Sorry for the long story - so is my wife. :D

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redial
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby redial » Mon Sep 28, 2015 5:21 am

But it is a happy story, so no need to apologise.
Len in Kapunda

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Aussie81Interstate
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby Aussie81Interstate » Sun Oct 04, 2015 12:41 am

Just back from a week away fishing.

did a total of 1100 km's or about 630 miles.

Average fuel consumption was 40.53mpg or in metric 9.15 litres/100 kms.

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redial
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby redial » Sun Oct 04, 2015 1:28 am

Hope you caught some good fish.

Those figures do not look extra flash, for a start 1100 Kms = 687.5 miles. Miles * 0.625. And is the 40 MPG Imperial or the US Gallons (Imp gal= 4.54 litres; and the US gal = 3.89)? Makes a world of difference. I just want to be able to compare it with mine.

I get about 300 Km on 22 litres, which is about 7.3 litres / 100 Km. This is running it on Unleaded 91 (our bottom octane).
Len in Kapunda

The world is not going to finish today, as it is already tomorrow in Australia and New Zealand, and other islands of foreign nations such as Guam and Samoa.

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Aussie81Interstate
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby Aussie81Interstate » Sun Oct 04, 2015 1:37 am

OK Len,

you can do the math your way - I just used an online conversion chart.

Actual figures 625 miles and used 54.9 litres.

can you tell me how many mpg and km/l ?

thanks

Charlie -

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redial
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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby redial » Sun Oct 04, 2015 2:00 am

That's better, Charlie.

625 miles = 1 000 Km. Divided by 54.9 litres = for the trip, gives 5.49 litres/100K.

OTOH, 1 000 Km = 625 miles. And 54.9 litres = 12.09 galls, giving you 51.6 MPG (in Imp galls); and in US gallons you used 14.11 gallons, which gives you 44.29 MPG US.

Now that is what you should be able to achieve on a well running bike that has just had a bit of a tune up. Well done!
Len in Kapunda

The world is not going to finish today, as it is already tomorrow in Australia and New Zealand, and other islands of foreign nations such as Guam and Samoa.

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Re: 1988 SE 1500 Carburettor question - fuel lines

Postby Aussie81Interstate » Sun Oct 04, 2015 5:58 am

Thanks for doing the conversions Len,

Most of the mileage was on highway runs and trying to keep to the speed limit on all roads - but hard to with the amount of rain - so more than likely 10-15km/h less in lots of places. Weather was quite warm on the first leg back, and not a lot of traffic so quite good time made, but this morning coming home was a bit slower with more traffic and lots of speed cameras, which my GPS detected quite well.

Overall very happy with the bikes performance, and the next item to purchase is a new fork brace - but need to save a bit more money first :)




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