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Author Topic: 1980 Honda XR250, Back on the Boards  (Read 753 times)

Offline OJ

  • Posts: 242
1980 Honda XR250, Back on the Boards
« on: Aug 29, 2018, 00:30:11 »
Hey guys. Took a break off the boards, sold my CB378 because I needed cash to finish my trailer sauna, but realized I needed a bike to wrench on. FFWD to last week, I found a 1980 Honda XR250 locally on kijiji and when I went to pick it up, turned out the seller had another bike in pieces. So now I'm a new owner of two 1980 Honda XR250's. One is pretty much complete, with surprisingly clean camshaft journals, but I am still waiting for a new cam chain as the old one is stretched and I figured I'll install a new one before putting it back together.

Not sure how active I'll be here, but I want to get the bike running to hit some trails and dirt/gravel roads. This will not be one of those ave inspiring fabrication masterpiece stories.


Offline advCo

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Re: 1980 Honda XR250, Back on the Boards
« Reply #1 on: Aug 29, 2018, 09:29:59 »
Welcome back bud. Looks like a good buy, the inside of that head looks brand spanking new. Carry on.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline Hurco550

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Re: 1980 Honda XR250, Back on the Boards
« Reply #2 on: Aug 29, 2018, 10:10:46 »
I want to get the bike running to hit some trails and dirt/gravel roads. This will not be one of those ave inspiring fabrication masterpiece stories.

Welcome back! And that's ok. I for one really enjoy seeing pics of where these bikes take people just as much as seeing the bike being built sometimes! Top end looks great!
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline OJ

  • Posts: 242
Re: 1980 Honda XR250, Back on the Boards
« Reply #3 on: Aug 30, 2018, 14:53:17 »
Got the new cam chain installled last night. The old chain was kinda weird with lots of stiff links. Anyway, she didnít start as thereís no spark. Did meter everything all the way to the coil and everything seems to be OK but therís no spark. New coil didnít fix it, but there might be issues with the resistor cap that I need to replace.

Or a question at this point. What kind of voltage is healthy when I kick it over. I metered from the generator and pulser and then where wires plug into the coil.

The wiring job on this bike is not the cleanest, so I might end up redoing the harness.
« Last Edit: Aug 30, 2018, 14:56:08 by OJ »

Offline OJ

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Re: 1980 Honda XR250, Back on the Boards
« Reply #4 on: Aug 30, 2018, 22:38:44 »
Well dammit! All the continuity seems to meter to the spec, but Iím still missing spark. When giving a good kick, my meter canít get the spike coming out of the CDI, but highest I managed to meter was 9-10V. The coils meters per spec, wire is new, resistor cap is new and plug is new. So what kind of black magic is going on here?

Offline OJ

  • Posts: 242
Re: 1980 Honda XR250, Back on the Boards
« Reply #5 on: Aug 31, 2018, 18:07:14 »
New ĒdevelopmentĒ here. Lesson 1, never ever trust the existing wiring if thereís issues. My wiring was messed up, but got it fixed. So now I get good 35-40V from CDI just using my hand to kick. My old coils are NFG, but I installed a new emgo coil on. This Emgo coil has bang on primary, but secondary is only 4.9 kilo ohm. I get virtually no power from the coil so I think itís safe to say this Emgo thing is no good for this bike. Can anybody kindly point me to a vendor where I could find 6V, 0.2-0.8 ohm primary and 8-15 kilo ohm secondary coil?

Offline irk miller

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Re: 1980 Honda XR250, Back on the Boards
« Reply #6 on: Aug 31, 2018, 18:24:18 »
You should be running an AC coil on this bike, not a DC coil.  Are you sure you have the right coil?

Offline OJ

  • Posts: 242
Re: 1980 Honda XR250, Back on the Boards
« Reply #7 on: Aug 31, 2018, 22:21:37 »
I think the emgo coil is DC. Itís an emgo 24-71536 coil that is supposed to work on XR and CR, but are newer models DC? I guess I need to find an AC coil somewhere.

Offline irk miller

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Re: 1980 Honda XR250, Back on the Boards
« Reply #8 on: Aug 31, 2018, 22:40:11 »
There's no battery and power to the lights are run directly off the alternator. That's the white/yellow wire in your handlebar switch.  That's usually indicative, especially with dirt bikes, of an AC system. But, as you say, fitment claims to be correct for your bike.

Offline OJ

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Re: 1980 Honda XR250, Back on the Boards
« Reply #9 on: Sep 02, 2018, 20:23:54 »
Back from the lake, and buddy had a spare AC coil with close-ish spec so Iíll get to give another try tomorrow. Having an old motorcycle enthusiast friend across the street has some benefits.