Author Topic: What have you done with your bike/s today?  (Read 36706 times)

Online BSA_54A10

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Re: What have you done with your bike/s today?
« Reply #1320 on: 29.07. 2020 09:04 »
Hi RD
The chainsaw units leak off some compression but leave enough to start the engine, then pop closed once the engine starts

John

Most are 10mm thread so might be a bit of fun fitting one to a 14mm plug hole
Most chainsaws run 100 to 170 psi @ 9000 rpm so they should be able to take the pressure.
They just bleed off some of the compression through a 2 mm hole so you can make it bigger if you like.

OTOH Victa lawnmower decompressors are threaded 14mm so will screw right into a normal plug hole
When converting the 160cc engines to power mini bikes or go carts it was usual to use the hole for a second plug particularly if you were running dope.
https://www.gaspares.com.au/products/DEC608?q=victa%20decompressor&product_code=DEC608&per_page=&product_page=&search%5Bcategory_url%5D=
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Offline RDfella

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Re: What have you done with your bike/s today?
« Reply #1321 on: 29.07. 2020 09:14 »
Undortunately no room for one of those on these cyl heads. Two valve head, plug one side, cam sprocket / chain / chainwell the other. Would have to dispense with the plug! Am still looking at the possibility of an electrically-operated solenoid to partially open the decompressor during the compression stroke & shut it around 45* before TDC as Honda do on their four strokes, albeit mechanically by a clever addition to the camshaft. Have looked at modifying the Yam cam to achieve this but it's as close to impossible as you'd get. Of course there's still the electric start option, which I'll know more about when the starter motor I've ordered arrives.
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beezermacc

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Re: What have you done with your bike/s today?
« Reply #1322 on: 29.07. 2020 14:06 »
The Cheshire Branch on the road again! Our Season Opener was run through the Derbyshire / Staffordshire Borders. YouTube video if you're interested!
https://www.youtube.com/watch?v=Jwc8cblNhIE&fbclid=IwAR3O85Y-6h0GrHh7FP6X4zS570nj1EIJKVBZwXRpp3N-zbRM2uqQufm4OZA
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Online muskrat

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Re: What have you done with your bike/s today?
« Reply #1323 on: 29.07. 2020 14:14 »
The two girls settling into their new home.
Cheers
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Re: What have you done with your bike/s today?
« Reply #1324 on: 29.07. 2020 15:27 »
The two girls settling into their new home.
Cheers
Great to see them together
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Offline berger

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Re: What have you done with your bike/s today?
« Reply #1325 on: 29.07. 2020 18:29 »
today I have fallen out with betsy beezer, after changing the pilot jet on the mikuni I still had to put the choke on AND give her a hand full before she would start, then choke off straight away because she cut out otherwise. I got her warmed up and set the tick over. it was a lot better than before and picked up without hunting with to rich a mixture like it used to. so all good until I had a run out and she stopped. had to start her on full choke with a hand full again. I stopped again after a few miles and tried to start her but no go unless full choke and another hand full of throttle. every corner I banked into and opened her up on she miss fired until upright again *pull hair out*. I am now home and enjoying the first black&tan *beer* since early march. the outcome of this is I am going to buy a new carb like the amal and try again. the lack of four teeth I had out is not helping the situation with the pains, but I am easing the pain a bit with drugs!! and now black&tans *smile* the good bit was blowing a ape hangered Harley off with me flat on the tank looking at 6000 rpm in 3rd *good3* until traffic spoilt the fun. thankyou for listening
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Offline RDfella

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Re: What have you done with your bike/s today?
« Reply #1326 on: 29.07. 2020 19:56 »
Aren't mikunis fun? And some people tell us they're easy to tune! They can come and do mine and yours. As we've discussed before. the various jets interact with each other, so one has to get the pilot jet spot-on before anything else. I tried 15, where it started fine on choke but wouldn't run anywhere else or without choke. Tried 30 - wouldn't start on choke, plug colour seemed fine but air screw made no difference. Am about to try 25's. For a 650 twin, Yamaha use 15 pilots.
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Offline ellis

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Re: What have you done with your bike/s today?
« Reply #1327 on: 29.07. 2020 20:29 »
Went for a pleasent ride this evening on the Notrun. Still waiting for our VMCC to open up so we can enjoy the rest of the fine weather.  (The nights are now drawing in so won't be too long before we start thinking about winter storage)  *cry*

ELLIS
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Offline berger

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Re: What have you done with your bike/s today?
« Reply #1328 on: 29.07. 2020 22:35 »
"aren't mikunis fun?" yes RD but hopefully not for long, just ordered a new Amal from burton bike bits, I hope it solves my issues, the old Amal didn't but that had years of abuse, from possibly lot's of people before I got it that's why I bought the mikuni. the one positive thing  with the Amal is ---- tickle and go, the mikuni has always been hit and embarrassing miss when starting hot or cold. I now can't be arsed to play with it anymore even though on a straight road it performed well until I banked over hard and needed instant power *bash*
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Offline RDfella

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Re: What have you done with your bike/s today?
« Reply #1329 on: 30.07. 2020 11:21 »
Reason I chose mikunis was because they’re compact compared with Amal Mk2’s. Had I known the tuning nightmare, I’d have made more room and gone for Amal. I love monobloc’s – concentrics slightly less, but neither go big enough for my application. Would have had to drop to 1 ¼”.
But they’re simple. Instead of a hundred combinations of jets (which interact with each other, making for real fun) there’s very few for the Amal, so a good chance of getting the jetting at least near correct in an hour or so. A couple of pilot jets to choose from (assuming it’s not fixed) a couple of slide cutaways (usually No3) one needle and two jets (usually 105). And main jet choice. When I started on the mikunis, I found there’s several pilot jets to choose from (which affect the whole throttle range) and I calculated around 300 needle / needle jet combinations on top of the cutaway and main jet choices. The only way you’d get one of those right would be on a test bed with exhaust gas analyser and checking throttle openings in tenths. And expect to be changing jets for a whole day or longer – assuming you’ve got the whole range of jets to hand.
As Berger has found out, get it starting reliably and it won’t run. Get it running throughout the throttle range and you can’t start it. I’m in the latter category at present. And when I say ‘run’ I mean just and only that. Whether it’s rich or lean I’ve no idea. I’ve been playing with these carbs for a month or more now and my patience is running very thin. It’s holding back the whole project as I have to run on a dummy tank for access to carbs, meaning I can’t fit tank or headlamp until carbs are done. Then there’s the mechanical difficulty starting to contend with. Having watched someone on youtube trying to start a Vincent I see I’m not alone……
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Online Angus

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Re: What have you done with your bike/s today?
« Reply #1330 on: 30.07. 2020 18:10 »
140 miles on the A10 around Suffolk and slipped quietly into Norfolk (but only just)  *smile*
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Re: What have you done with your bike/s today?
« Reply #1331 on: 30.07. 2020 18:55 »
140 miles on the A10 around Suffolk and slipped quietly into Norfolk (but only just)  *smile*
They let you in!?
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Online BigJim

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Re: What have you done with your bike/s today?
« Reply #1332 on: 30.07. 2020 20:20 »
Just converted back to 6 volt after big fun trying to trace cause of overcharging! Will post details on suitable page. Just hope i can find a 6v tail light bulb! I will not be posting pictures of the cack handed bodgery, poor beezermac would have a fit! I am deffo a bad person, but i may have a headlight for the weekend.
 *bash* *bash* *problem* *bright idea* *countdown* *whistle* *beer* *wave*
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Jamie,  Supporter of Distinguished Gentleman's Ride

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Re: What have you done with your bike/s today?
« Reply #1333 on: 30.07. 2020 20:51 »
G'day Fellas.
Pulled both wheels off the HD for new tyres (hate to have a flat on the side of the road). The tyres that are on it are still good for depth of tread but over 5 years old. Going to try the Pirelli Rout 66. 80/90-21 front, 130/90-16 rear. I'll have to learn to stop pushing it like the other bikes!
Cheers
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Re: What have you done with your bike/s today?
« Reply #1334 on: 30.07. 2020 21:33 »
Quote
They let you in!?
Yes they let us in, but they did make derogatory comments about suffolk and Ipswich Town in particular  *fight* .
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1961 A7 since 1976
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