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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 00:23 - 19 Jan 2020 Post subject: |
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Just for reference, if the pump is actually going in and out (stroking? is that the word?) it should move ~0.25mm at idle and 2mm full throttle.
If it is working (which seems to be the case) I just need to check the clearance on the throttle metering thingy at the two positions and add/remove/change the shim to compensate...
Assuming the tension has been set correctly (which I haven't done ) which is just a case of aligning the pin that sticks out with a mark. ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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WD Forte |
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WD Forte World Chat Champion
Joined: 17 Jun 2010 Karma :
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Easy-X |
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Easy-X Super Spammer
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Posted: 01:26 - 19 Jan 2020 Post subject: |
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I think I read somewhere it's a factor of 200 which I assume means at 2000 rpm it does 10 strokes a minute... in other words in and out every 6 seconds. ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 18:44 - 19 Jan 2020 Post subject: |
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So today I went up and down the road a bit! Only in 1st gear
I added the mudguards front and back as the rear one has the number plate. Then I threw on the £15 Chinese seat:
https://i.imgur.com/TNI0lUx.jpg?1
"Wow! Actually this isn't too bad!!!" Might need some adjustment or a new bracket here:
https://i.imgur.com/ZSOfG1L.jpg?1
Not a major job but check the rear brackets:
https://i.imgur.com/CGX7oM1.jpg?1
Near perfect fit!!! I need to check the seat is resting on the frame properly (to take the weight rather than the mudguard) but other than a couple of cheeky bolts it'd be a done job
I had another look at the oil pump. First time I got the engine running it was dripping consistently - not much but it was doing something - and then I simulated full throttle (at the pump) and it was a bit of a dribble. So far so good. Faffed about with something else and came back to it... nothing, not even a drop Did "full throttle" again and some oil came out but not much. To be perfectly honest: I don't trust it
As the Chinese seat would fit nicely bolted down (not quite the right shape to hinge like the original) and the original, heavy metal seat pan is, to use the technical term, fucked and reproductions would be ~$150 from Vietnam...
Combine that with a suspect oil pump (which is the only reason you need a hinged seat: to get to the oil tank) and it's a pretty easy decision: blank off the pump and use the cheap seat. TBH the only downer is dumping out the gearbox oil to pop the crank case cover off.
Going premix isn't the end of the world really. Not unless I was going to rack up the miles commuting on the thing But it's probably better to have a tank of premix sitting than pure petrol considering this is an occasional use bike.
"So how was the ride?"
I'm glad you asked I dunno, seemed okay I was too busy making a meal of feathering the clutch to notice much which I suppose is a good thing i.e. the handling wasn't so off it drew my attention. Definitely need to reconnect the neutral light though as the gear box is very light compared to the Rebel.
Clutch works, front brake works, back brake needs some serious adjustment though. Might have put the brake arm back on the wrong spline position.
I was going to do the electrics but most of the clock lights are on the tacho I removed...
The tacho works most definitely (with the old tacho cable and an electric drill) but here's the thing:
It only registers if the tacho cable end is revolving clockwise but connected to the bike engine the cable is running anti-clockwise
WTF? ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Easy-X |
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Easy-X Super Spammer
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Posted: 19:52 - 19 Jan 2020 Post subject: |
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Regarding the tacho, it seems logical that the cable should rotate clockwise considering the needle sweeps clockwise but the bike is definitely anticlockwise!
Before anyone suggests it: no, I haven't put the gears inside the crank case the wrong way round as they can only go in one way
Having said that I shall pin this problem until the oil pump blanking kit turns up as I'll be having the whole side off and can scrutinise the tacho gear assembly.
If all else fails I'll have to get a tacho angle drive ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Easy-X |
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Easy-X Super Spammer
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Posted: 23:07 - 19 Jan 2020 Post subject: |
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Brand new shoes. Drums look good. I errrr... neglected to mark the original arm positions so it's probably in the wrong position. ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Sister Sledge |
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Sister Sledge World Chat Champion
Joined: 17 Aug 2018 Karma :
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Posted: 10:37 - 20 Jan 2020 Post subject: |
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My arse likes the look of that seat but it would look naff on my bike
I bet that short ride was like nothing you've experienced. 50cc scoots are like a polar opposite! ____________________ CCM 404 DS |
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Easy-X Super Spammer
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Posted: 11:33 - 20 Jan 2020 Post subject: |
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WD Forte |
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WD Forte World Chat Champion
Joined: 17 Jun 2010 Karma :
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Easy-X |
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Easy-X Super Spammer
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Posted: 18:11 - 20 Jan 2020 Post subject: |
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WD Forte wrote: | Stop!!
Get off you fool!!
You're not supposed to ride the bloody thing,
it'll get dirty!
Just stick it on Ebay as a rare/classic/cafe/bobber/custom
reluctant sale/so sad to see her go etc and ask for squillions of beer chits. |
You say that but when I explained the tacho problem in the office my mate said "why not just fit a digital meter?"
It was a bit hard to explain why that's a bad idea... hang on a moment
Why don't I convert it to 12V, CDI, put on road tyres, a new fuel tank, change the handlebars and call it a "Café Racer"
No, that won't work, missing something Ah yes, strip the side panels and add a pod filter, perfect! ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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WD Forte |
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WD Forte World Chat Champion
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WD Forte |
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WD Forte World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 22:06 - 20 Jan 2020 Post subject: |
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Being frank, the rev-counter is just decoration anyway. If you can't tell when you need to change gear on a 125 2t, you're doing it wrong.
Go full hipster and use the tacho drive to wind a portable gramaphone. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Easy-X Super Spammer
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Easy-X |
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Easy-X Super Spammer
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Posted: 01:36 - 21 Jan 2020 Post subject: |
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Learn something new every day! I didn't know 2-strokes can run backwards
So that's me nominated for "Top n00b 2020"
And guess what: to fix it (bad timing that is) I turned up a Tef post on this very forum from 2011. O.M.G.
Would make sense really. I've been dicking about no end with the thing. Sometimes it starts easy, sometimes it doesn't... I shall now scrutinise the tacho cable rotation when slowly operating the kicker with the spark plug out and see which way round it goes.
Good news is if it is bad timing (or busted woodruff key) I bought the correct puller tool for the magneto from Yambits a while back. ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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WD Forte |
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WD Forte World Chat Champion
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Easy-X |
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Easy-X Super Spammer
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Posted: 02:15 - 21 Jan 2020 Post subject: |
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Well it'd be my luck that I managed to get the engine running backwards when testing the tacho and then forwards after I pushed it out the garden ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Sister Sledge |
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Sister Sledge World Chat Champion
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Easy-X |
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Easy-X Super Spammer
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Posted: 11:23 - 21 Jan 2020 Post subject: |
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I've looked at the parts diagram time and again and no, you can't get the bits in wrong No, more likely the timing is way off...
The other thing I learned: "oh no, it can't run backwards 'cos there was a big problem with this on DT100s & DT175s so Yamaha fitted a diode on later models." Yeah, really? I don see no stinkin' diode Either it never had it or someone deleted it way back.
BTW the DT125 of this era is an entirely different beast having a 12V system and a dynamo/starter motor. Electric start, on a dirt bike, in the '70s... wow! Learnt so much working on this bike ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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blurredman |
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blurredman World Chat Champion
Joined: 18 Sep 2010 Karma :
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Posted: 12:42 - 21 Jan 2020 Post subject: |
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I had a case two years back where my ETZ250 kept running backwards. I had recently purchased an electronic ignition kit for it and since installing it was running backwards- And what is more, it would change direction even just idling!
I put it down to the magnets on the rotor/cam not being at 180 degrees like they should be, and instead being more like 45/90 degrees.
It was quite difficult to ride backwards though.. I did try! ____________________ CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S.
Current: 1973 MZ ES250/2 - 17k. , 1979 Suzuki TS185ER - 9k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 38k, 1989 MZ ETZ251 - 49k |
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stinkwheel |
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stinkwheel Bovine Proctologist
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Easy-X Super Spammer
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Diggs World Chat Champion
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Posted: 15:45 - 21 Jan 2020 Post subject: |
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Could that be an in-line suppressor? In the olden days, electrical interference from engines used to affect radios.... ____________________ Now - Speed Triple, old ratty GS550, GSXR750M
Gone (in order of ownership) - Raleigh Runabout, AP50, KH125, GP125, KH250, CBX550, Z400, CB750FII, 250LC, GS550, ZXR750H1, Guzzi Targa, GSX750F, KH250 x2, Bimota SB6R and counting... |
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Easy-X Super Spammer
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Old Thread Alert!
The last post was made 4 years, 106 days ago. Instead of replying here, would creating a new thread be more useful? |
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