Author Topic: í89 XLH1200 Single?  (Read 767 times)

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Offline cyclobutch

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í89 XLH1200 Single?
« on: March 20, 2017, 02:40:11 AM »
Iíve had an ongoing problem with my bike this last couple of years in that one of the cylinders seems a bit lazy, for instance being late to chime in when starting on the choke. Last year that had got bad enough that it had a tendency to drop onto one whenever the revs fell Ė all a bit awkward for in town riding, especially when that second cylinder chimed back in again. So Iíd put it to one side (I have other bikes to ride).

Finally got around to looking at it the other week. First up was a compression test. I know this is supposed to be with an open throttle, so I pulled off the air cleaner and then clamped up the slide (CV carb) to do this. In psi I got 165 on the rear and 155 on the front. Iím not sure on the spec for this engine Ė itís an original 1200 that has never been broken down, but they are at least within 10% of each other. So I figure that is OK.

The bike was fitted with a CV carb with no accel pump, a peculiarity from around that time I think, so all OE. Iíd taken the opportunity to buy a later one with the pump (from an í04) so then fitted that. Firing up on the driveway (after standing for maybe around 6 months) it still seemed a bit one sided until it warmed through. I have the bike on SORN (itís a UK thing Ė ĎStatutory Off Road Noticeí; for those too stingy to pay road tax in the winter months) until the end of the month so canít road test until April but Iím not hopeful.

I guess the next trick will be to look at the ign. The plugs both looked good when I pulled them, and I replaced the coils and leads only a couple of years ago so donít really expect any issues in that area.

Anyone got any insights on where I should be looking next? Thanks. 
B
'88 XLH1200

Offline aswracing

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Re: í89 XLH1200 Single?
« Reply #1 on: March 20, 2017, 08:13:55 AM »
In stock form, it's dual-fire. So one thing you could try is switching the spark plug wires front to rear, and see if the issue follows. That would tell you if it's electrical or not. Also do the same trick with the spark plugs.

Also, the no-accelerator-pump CV was 1988 only. In 1989 they got the pump.

Offline cyclobutch

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Re: í89 XLH1200 Single?
« Reply #2 on: March 21, 2017, 01:51:28 AM »
Thanks - I'm not even sure which cyl drops but that sounds like a plan. I've noticed that the date stamps on various components on this bike are marked up as '88 so that makes sense. I guess it took a long time getting here on the boat, or sat in a showroom for a while before getting registered.
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'88 XLH1200

Offline Panzer

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Re: í89 XLH1200 Single?
« Reply #3 on: March 21, 2017, 02:15:39 PM »
Let us know what happens when you do as suggested.
You don't have to shovel sunshine ..... let's ride.

Offline cyclobutch

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Re: í89 XLH1200 Single?
« Reply #4 on: March 22, 2017, 06:08:31 AM »
Yep, sure. It'll be a couple of weeks now before I can look at it again, and as noted - April before I'll run it up the highway anyway.
B
'88 XLH1200

Offline King Inky

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Re: í89 XLH1200 Single?
« Reply #5 on: May 03, 2017, 08:47:51 AM »
Hey cyclobutch,

Have you gotten around to checking this out? By the sound of it, I believe I had a similar problem. My suggestion is to check your spark plugs and see if they are the same color or if one happens to be carbon fouling or if one is turning white due to a lean condition. If that is the case, it is most likely a bad intake seal (not terrible to replace if you have ball-end allen wrenches).

Keep us posted and hopefully you can get it solved to get out and ride!

Offline Panzer

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Re: í89 XLH1200 Single?
« Reply #6 on: May 03, 2017, 06:27:00 PM »
Try changing plugs too...... to the specified ones it calls for.
You don't have to shovel sunshine ..... let's ride.

Offline Panzer

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Re: í89 XLH1200 Single?
« Reply #7 on: May 06, 2017, 04:05:04 PM »
AMAZING............NEEDS HELP AND NEVER A FEED BACK AS ASKED..............BUTT HEAD.  :idunno:
You don't have to shovel sunshine ..... let's ride.

Offline cyclobutch

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Re: í89 XLH1200 Single?
« Reply #8 on: May 19, 2017, 05:26:49 AM »
Oi Ė be nice. Iíve not had time to pull the old gal out from under cover. Iíve been needlessly replacing a whole load of ignition components in a Sunbeam (a wretched machine to be sure), trying to make a Morini brake a little better (now thereís a Vee twin with all the character of a rattly Honda single), and re-fork the Bantam Ďpie crust racerí after my last get off.

I do appreciate any input here, and will report on findings once Iím back under way with it. I did pull the plugs when I made that compression test Ė they looked pretty much spot on.

And thanks for your continued patience Ė I will get back to this.     





B
'88 XLH1200

Offline cyclobutch

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Re: í89 XLH1200 Single?
« Reply #9 on: May 30, 2017, 01:32:36 AM »
Just a quick update. I decided to bite the bullet and plumped for a new coil, leads (with caps) and plugs. I found the time to put the bike up on the table and fit those yesterday. Bike fired up on the driveway OK, but runs snotty on the choke Ė and needs it for a while so Iíve no view of the overall effect at this point. Being in the dying days of another month I wasnít going to stump up for road tax (complete months only) just to take a test ride. Should be doing this next weekend.

On removal the rear plug was a good deal blacker than the front, but given my last run out was only local to the MOT station I think this is probably not indicative. One other note on those Ė I see that HD brand plugs are recommended; Really? Thatís what came this time and Iíve fitted. The plugs I took out were NGKs.
B
'88 XLH1200

Offline cyclobutch

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Re: í89 XLH1200 Single?
« Reply #10 on: June 05, 2017, 05:22:22 AM »
So I got the old gal all legal and out on the road at the weekend. Only for a brief ride mind Ė to the local shops. So never really got off the choke (enricher) properly, and I suspect I have made the classic mistake of fooling with too many things at once Ö new carb and new coil. Somewhere out there the bike got real arsey, spitty and farty. A quick check showed that the HT leads were at least properly plugged in both ends. Itís bad enough Iíll not be using it for the daily commute out to the railway station this week. Iíll look to take it for a longer run at the weekend and then go looking for air leaks I guess.   
B
'88 XLH1200

Offline cyclobutch

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Re: í89 XLH1200 Single?
« Reply #11 on: June 12, 2017, 12:52:12 AM »
A final update on this one. I ran the bike out a little further at the weekend and with the same serious popping and banging going on. Back at home and up on the table I swapped the carb back over. Out on the road, all of that issue was cleared again, and the original problem Ė that of the lazy cylinder seems to be pretty much cleared.

So the problem appears to have lain in the coil, leads area Ė as suggested here. Many thanks.

Though itís kind of good and bad Ė the coil I took off is really no age at all. I fitted that myself only a couple of years and a few thousand miles ago.
Of the carb problem I now have Iíll start a new thread.
B
'88 XLH1200