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mrr1 |
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mrr1 Traffic Copper
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Posted: 23:01 - 06 Jan 2019 Post subject: 1983 Honda cb650 hot start problems |
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righto gents.....
for some bizarre reason I decided to pick up an old 1983 honda 650 Nighthawk. Decent enough nick, rides like a pig- shite in corners, frightening brakes (rear drum almost better than twin discs up front) but howls like a banshee when on full chat and (just about) able to keep up with a mate on his 350 YPVS.
however.....from cold she starts straight on the button but shes a b@$T@&d when hot. Engine turns over happily but just will not catch. Leave it to go cold and all is fine. At the mo' I'm carrying a pocket power pack - a slight glimpse of extra battery oomph and shes away.
Im assuming that either the 36 year old coils may be packing up when hot or shes flooding when hit and standing or something else.....
any ideas?
anyone know anything about the hot start systems on these old bikes? ____________________ TRX850, TDM900, ST1300, CB650SC Nighthawk, ragtop Saab, gym membership, messy divorce, large chested blonde fiance
Damn, I'm loving my midlife crisis. |
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jaffa90 |
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jaffa90 World Chat Champion
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mrr1 |
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jaffa90 |
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Meatybeaty |
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yen_powell |
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yen_powell World Chat Champion
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mrr1 |
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mrr1 Traffic Copper
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Posted: 16:43 - 07 Jan 2019 Post subject: |
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Meatybeaty wrote: | mrr1 wrote: | Don't know
Full choke on start if cold, don't go near it when warm
Ticks over nicely and evenly
Just after dinosaurs left |
Got a couple of 83 Nighthawk Manuals I can PM you if needed |
You, sir, are a GOD!! ____________________ TRX850, TDM900, ST1300, CB650SC Nighthawk, ragtop Saab, gym membership, messy divorce, large chested blonde fiance
Damn, I'm loving my midlife crisis. |
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mrr1 |
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yen_powell |
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mrr1 |
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mrr1 |
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Meatybeaty |
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mrr1 |
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mrr1 Traffic Copper
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Posted: 14:28 - 11 Jan 2019 Post subject: |
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Hmmmmm, I'll take a look.
Think I'm going to strip the main starter, coil and plug leads and clean up / replace. I carry a pocket jump starter and the hint of extra current brings the old girl straight back to life whenever this hot start shite happens....
I'm trying to figure out which bits can go shitty when warm........coils? Leads? ECU? ____________________ TRX850, TDM900, ST1300, CB650SC Nighthawk, ragtop Saab, gym membership, messy divorce, large chested blonde fiance
Damn, I'm loving my midlife crisis. |
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Dr. DaveJPS |
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Dr. DaveJPS World Chat Champion
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Posted: 14:51 - 11 Jan 2019 Post subject: |
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Are the spark plugs are the right temperature? ____________________ "intelligent inattention is preferable to unintelligent tinkering"
www.davejps.com |
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mrr1 |
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Posted: 15:40 - 12 Jan 2019 Post subject: |
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Checked out choke system, all seem to be good.
Stripped back main battery feeds to solenoid and starter. Fitted new feed to solenoid, cleaned all contacts especially the furry ones on the starter. Seems to be happier starting when hot.... I think.
Am currently having a sausage cob in Stalkers cafe, about to give it a real world test. Wish me luck........
Dunno if Chris walker really want a fat old fuckwit trying to bumpstart a shitty old honda in front of his Kwakker dealership... ____________________ TRX850, TDM900, ST1300, CB650SC Nighthawk, ragtop Saab, gym membership, messy divorce, large chested blonde fiance
Damn, I'm loving my midlife crisis. |
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jaffa90 |
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WD Forte |
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WD Forte World Chat Champion
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mrr1 |
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mrr1 Traffic Copper
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Posted: 18:31 - 12 Jan 2019 Post subject: |
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Thanks WD. By "pulsers" do you mean coils or the cdi igniter box under the seat that feeds the coils?
I actually had a really interesting run. Started out dodgy. Ran for half a mile and started missing on one, then two then totally died. Then remembered the frigging fuel tap (doh!!).
Gave her a bit of a caning for ten minutes then sat and enjoyed my tea and butty.
After fifteen minutes I tried the starter. This was when I was seeing the issue before.
Absolutely bang on the button!!!!!!! I think with old age maybe a few bits and bobs are getting fusty when hot and killing some of the spark. As I said before the engine would turn over and over on the starter but simply not catch. I think / hope / reckon by sorting the solenoid and starter contacts I've allowed the starter to do it's job without taking too much of the battery's lovely electric goodness and actually leaving some for the ignition circuit.
I'm about to use the seven most deadly words known to man.
Fuck me, I think I've fixed it. ____________________ TRX850, TDM900, ST1300, CB650SC Nighthawk, ragtop Saab, gym membership, messy divorce, large chested blonde fiance
Damn, I'm loving my midlife crisis.
Last edited by mrr1 on 18:51 - 12 Jan 2019; edited 1 time in total |
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mrr1 |
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Old Thread Alert!
The last post was made 5 years, 144 days ago. Instead of replying here, would creating a new thread be more useful? |
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