Search found 419 matches

by hhh
Mon Nov 04, 2019 7:01 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 102
Views: 11762
Flag: Canada

Re: 1000-Series 2/4-stroke Concentrics

Thanks for the clarification. Since stock needles are steel, I had assumed you wanted a stronger needle jet made of steel for it to work against. However, the wearing of similar metals problem might arise if the alloys are very similar. So what you meant was to compensate for a worn needle jet with ...
by hhh
Sun Nov 03, 2019 6:31 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 102
Views: 11762
Flag: Canada

Re: 1000-Series 2/4-stroke Concentrics

I have no doubt that you know this; that your 1065 needle jet needs to be smaller to cure the bottom end richness and that it's effect will stretch as far up as the mid throttle position. I didn't go into all the gory detail in what I posted earlier, but I started with a #3 slide, machined it into ...
by hhh
Mon Oct 14, 2019 2:03 pm
Forum: Tech
Topic: Oil use by date
Replies: 13
Views: 1212
Flag: Canada

Re: Oil use by date

The oil itself doesn't wear out, but the additives certainly do. Here's a study that supports the viscosity degradation due to use: https://www.researchgate.net/publicatio ... ur-Wheeler .
by hhh
Sat Oct 12, 2019 4:15 pm
Forum: Tech
Topic: Oil use by date
Replies: 13
Views: 1212
Flag: Canada

Re: Oil use by date

Not only does oil not expire, it doesn't wear out. Let me qualify that: multi-grade oils in service will trend towards the lower (Winter) viscosity of their grade as they're used, e.g., 20W50 will eventually become 20 weight because the long chains that respond to temperature get sliced up and event...
by hhh
Sun Aug 18, 2019 3:57 pm
Forum: Tech
Topic: Sympathy for Victor
Replies: 5
Views: 1039
Flag: Canada

Re: Sympathy for Victor

Let me put it this way: I built a B44 engine out of mostly used swap meet parts, on a budget of CDN$500 all in, some on the edge of usability, like a big end with 0.003" play, and I've been thrashing it every which way from cold for about 11 years, and I can't kill it.
by hhh
Sat Aug 10, 2019 5:22 pm
Forum: Tech
Topic: B44 to 82mm
Replies: 9
Views: 1846
Flag: Canada

Re: B44 to 82mm

Does anyone sell an 82mm barrel and piston kit ready to go for a B44 (similar to Burton Bike Bits' 84mm kit)?
by hhh
Wed Jul 03, 2019 3:29 pm
Forum: Tech
Topic: Conical rear hub offset.
Replies: 18
Views: 2415
Flag: Canada

Re: Conical rear hub offset.

Zuff, yes, that along with the rim width (which he'll obviously be able to measure) will give the builder what he needs to set the offset. You'll want to measure from the mating surface of the sprocket where it meets the hub to the frame tube center-line.
by hhh
Tue Jul 02, 2019 6:08 pm
Forum: Tech
Topic: Conical rear hub offset.
Replies: 18
Views: 2415
Flag: Canada

Re: Conical rear hub offset.

It may be easier to use the frame top tube center-line rather than the front wheel for alignment. It should be dead center in the frame (not the swing arm.)
by hhh
Mon Jul 01, 2019 4:22 pm
Forum: Tech
Topic: Conical rear hub offset.
Replies: 18
Views: 2415
Flag: Canada

Re: Conical rear hub offset.

The offset only determines the position of the tire center in the frame. The chain alignment is set solely by the spacers on the axle and the swingarm positioning. Offset is normally measured from the hub surface (where the sprocket attaches) to the rim flange. There should be a standard figure avai...
by hhh
Sun Jun 23, 2019 6:40 pm
Forum: Tech
Topic: Tooth found in gauze when changing oil
Replies: 6
Views: 1651
Flag: Canada

Re: Tooth found in gauze when changing oil

It has to be from the cam drive or oil pump. How long is it? Either way, that's not good obviously. I would at a minimum pull the inner cover to investigate. You can do this without pulling the primary apart as detailed somewhere in this forum.
by hhh
Tue May 28, 2019 5:55 pm
Forum: Tech
Topic: b25ss timing cover bung plug/past shortage of B50 kickstart quadrants
Replies: 17
Views: 2894
Flag: Canada

Re: b25ss timing cover bung plug

I'd be suspicious that a centered machining job were factory! This cover with the same part number has the boss but no hole:

https://www.ebay.com/itm/BSA-B25-B44-Ou ... SwxYxUv~CG
by hhh
Thu May 02, 2019 7:10 pm
Forum: Tech
Topic: Truckle slide
Replies: 20
Views: 3938
Flag: Canada

Re: Truckle slide

Thanks for the clarification. I think what's being achieved is a more linear opening rate, i.e., more gradual from idle to small opening.
by hhh
Thu May 02, 2019 2:54 pm
Forum: Tech
Topic: Truckle slide
Replies: 20
Views: 3938
Flag: Canada

Re: Truckle slide

So the radius is upside down, i.e., it parallels the the shape of the top of the throat?
by hhh
Thu May 02, 2019 1:14 am
Forum: Tech
Topic: Truckle slide
Replies: 20
Views: 3938
Flag: Canada

Re: Truckle slide

David Taylor wrote:
Thu May 02, 2019 1:00 am
The filed part is just about 1mm to 1.5mm deep and should follow the radius of the carb throat.
I don't understand this part. It looks like a tiny "mouse hole" in the bottom of the port side of the slide. Where does the radius of the carb throat come into it? Thanks.
by hhh
Mon Apr 29, 2019 8:20 pm
Forum: Tech
Topic: B50 doesn't like tickling
Replies: 6
Views: 1745
Flag: Canada

Re: B50 doesn't like tickling

My B50 doesn't care if you tickle it or not, but starts first kick cold if you raise the throttle stop screw 3/4 turn or so.
by hhh
Fri Apr 26, 2019 3:33 pm
Forum: Tech
Topic: Time saver removing outer timing cover
Replies: 0
Views: 1414
Flag: Canada

Time saver removing outer timing cover

I discovered that the outer timing cover can be removed and replaced without removing the kicker arm. I was surprised to discover that if you hold the kicker lever horizontal towards the back of the back of the bike, it allows clearance for the kicker stop pin to locate, and the spring fixed end loc...
by hhh
Fri Apr 26, 2019 2:06 pm
Forum: Tech
Topic: B25 ignition advance curve
Replies: 2
Views: 1125
Flag: Canada

Re: B25 ignition advance curve

I think that curve is a problem. It should be shifted about 1000 RPM to the left.
by hhh
Tue Apr 23, 2019 3:16 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 102
Views: 11762
Flag: Canada

Re: 1000-Series 2/4-stroke Concentrics

Isn't Colourtune only for idle adjustment? If you were to run it through the range, wouldn't there be a risk of detonation due to it being the wrong heat range?
by hhh
Fri Apr 12, 2019 6:16 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 102
Views: 11762
Flag: Canada

Re: 1000-Series 2/4-stroke Concentrics

I'm at sea level with a 1974 850 with slotted spray tubes in probably slightly too tightly sleeved 932s, peashooters with no balance pipe, 9:1ish compression and it likes 230 mains.
by hhh
Mon Mar 04, 2019 2:43 am
Forum: Tech
Topic: Megacycle 541x11
Replies: 6
Views: 1699
Flag: Canada

Re: Megacycle 541x11

I have the MX cam in my B44 and I have to say it performs across the rev range quite well, but I don't have anything to compare it to. I'm after a broad torque spread for the road as that's what makes these bikes enjoyable. The wider lobe spacing sounds like a good approach to reduce problems at the...
by hhh
Fri Mar 01, 2019 1:46 am
Forum: Tech
Topic: Megacycle 541x11
Replies: 6
Views: 1699
Flag: Canada

Re: Megacycle 541x11

Thanks Stan, what are the characteristics of the x4 cam vs. a stock MX cam in a stock or mildly ported/valved motor (in terms of road manners)? Thanks!
by hhh
Fri Feb 08, 2019 4:57 pm
Forum: Tech
Topic: B25 Ignition Coil
Replies: 2
Views: 1028
Flag: Canada

Re: B25 Ignition Coil

Either will work just fine, but the 5 ohm will use less power and the 3 ohm will let you "upgrade" to EI later without changing it if you like.
by hhh
Thu Feb 07, 2019 10:33 pm
Forum: Tech
Topic: WM3 19" Front Rim?
Replies: 2
Views: 846
Flag: Canada

Re: WM3 19" Front Rim?

Just found this on TheVincent.com site: "the current Avon handbook recommends using wider wheel rims for their range of tyres, e.g.a 100 x 90 H19 requires a WM3 rim. this tyre fitted to a WM2 rim looks very "pinched" on this narrow rim. The sidewalls slope steeply inwards whereas on a WM 3 rim the t...
by hhh
Tue Feb 05, 2019 7:52 am
Forum: Tech
Topic: WM3 19" Front Rim?
Replies: 2
Views: 846
Flag: Canada

WM3 19" Front Rim?

I've been given a WM3 19" alloy rim that seems to be in serviceable condition and I plan to lace it to an '69 8" TLS hub for my road going B44. Am I likely to have any issues with clearances or tire choice? I tried searching on this but the silly search engine ignores "WM3."
by hhh
Sat Feb 02, 2019 6:03 pm
Forum: Tech
Topic: B44 Big Bore Kit
Replies: 6
Views: 1362
Flag: Canada

Re: B44 Big Bore Kit

Thanks lathejack, that all makes sense. The downside being no overbores are possible, but I suppose you could always sleeve it back to stock. Now I just need them to get back in stock and a hard Brexit to crash the pound.
by hhh
Sat Feb 02, 2019 4:13 pm
Forum: Tech
Topic: B44 Big Bore Kit
Replies: 6
Views: 1362
Flag: Canada

Re: B44 Big Bore Kit

Mark's condition may only apply to the stock liner. Maybe these are thicker? There's not much detail.
by hhh
Sat Feb 02, 2019 5:00 am
Forum: Tech
Topic: B44 Big Bore Kit
Replies: 6
Views: 1362
Flag: Canada

Re: B44 Big Bore Kit

Maybe a more pertinent question is: is there any technical reason why this is a bad idea? I.e., is there sufficient cylinder wall thickness? Note the bore is Nikasil plated. Is it possible they haven't made any yet and are first gauging demand?
by hhh
Wed Jan 30, 2019 6:31 pm
Forum: Tech
Topic: B44 Big Bore Kit
Replies: 6
Views: 1362
Flag: Canada

B44 Big Bore Kit

by hhh
Tue Jan 29, 2019 3:53 pm
Forum: Tech
Topic: Megacycle 541x11
Replies: 6
Views: 1699
Flag: Canada

Re: Megacycle 541x11

I emailed the seller and he's revised the listing now dropping the higher lift to the same as the lower one. I'd guess this cam would give at least 5 HP less than stock but would pull hard in the very low RPM.
by hhh
Mon Jan 28, 2019 6:35 pm
Forum: Tech
Topic: Megacycle 541x11
Replies: 6
Views: 1699
Flag: Canada

Megacycle 541x11

Anyone heard of this cam before?:

https://www.ebay.com/itm/Megacycle-Comp ... 4090573666

I can't find it in the Megacycle catolog and the specs look really suspicious, especially the lift.
by hhh
Wed Jan 09, 2019 9:59 pm
Forum: Tech
Topic: QD Hub
Replies: 6
Views: 1122
Flag: Canada

Re: QD Hub

I applied heat on mine to break the Loctite.
by hhh
Wed Jan 09, 2019 9:10 pm
Forum: Tech
Topic: QD Hub
Replies: 6
Views: 1122
Flag: Canada

Re: QD Hub

A somewhat drastic measure you could take is to heat the brake drum and leave the wheel out in the cold just prior to assembly.
by hhh
Wed Jan 09, 2019 8:18 pm
Forum: Tech
Topic: QD Hub
Replies: 6
Views: 1122
Flag: Canada

Re: QD Hub

I have the opposite problem. I have to use Loctite to take up the slack in mine or I have nasty backlash. Have you tried a different orientation of the mating parts?
by hhh
Sun Jan 06, 2019 11:27 pm
Forum: Tech
Topic: Sifton HT cam vs. Megacycle X4
Replies: 26
Views: 6016
Flag: Canada

Re: Sifton HT cam vs. Megacycle X4

Reviving an old thread here to ask if anyone has tried the results of reversing the exhaust lifter for an effective 6 degree wider LSA on either the SS or MX cam? I'm into Austin A-Series (Mini) engine tuning and modern thought for road cam timing is much reduced overlap and quicker opening profiles...
by hhh
Fri Dec 28, 2018 9:51 pm
Forum: Tech
Topic: New B40 oil leak.
Replies: 25
Views: 2979
Flag: Canada

Re: New B40 oil leak.

Get well soon Jeff, I feel for you. I had a detached retina, twice in the same eye, two months apart. Both times I had to spend $1000 to go to the mainland for laser reattachment surgery which, according to the doctor, "doesn't hurt" but for a few instances felt like a white hot ice pick at 100,000 ...
by hhh
Fri Dec 28, 2018 6:23 pm
Forum: Tech
Topic: New B40 oil leak.
Replies: 25
Views: 2979
Flag: Canada

Re: New B40 oil leak.

Jeff, do make sure that this gets reported as an adverse vaccine reaction. Too often these occurrences aren't reported and the myth that all vaccines are "safe and effective" gets repeated ad infinitum while the other side is buried and lied about to maintain profits. For anyone else considering the...
by hhh
Wed Dec 19, 2018 5:05 pm
Forum: Tech
Topic: Advantages of a Power box/Podtronics over a Zenor Diode
Replies: 10
Views: 2149
Flag: Canada

Re: Advantages of a Power box/Podtronics over a Zenor Diode

Back in the day, the common rule was - if your Zener dies, switch on the headlight as it compensates for the load into the battery. I have a solid state rectifier on my B50 with a Zener on a decent ally plate and bugger me does that get hot very quickly. Something weird going on there! So I run wit...
by hhh
Mon Dec 17, 2018 12:12 am
Forum: Tech
Topic: Advantages of a Power box/Podtronics over a Zenor Diode
Replies: 10
Views: 2149
Flag: Canada

Re: Advantages of a Power box/Podtronics over a Zener Diode

skippy wrote:
Fri Dec 14, 2018 10:55 pm
I would be happier with a lower voltage for my podtronic as it is mostly floating the battery which should be 13.8 maximum not 14.4V, which is to high for an AGM battery.
If you've got 14.4V now and want closer to 13.8V, you could put a power diode, like a 1n4007, in series with the regulator.
by hhh
Fri Dec 14, 2018 9:21 pm
Forum: Tech
Topic: Advantages of a Power box/Podtronics over a Zenor Diode
Replies: 10
Views: 2149
Flag: Canada

Re: Advantages of a Power box/Podtronics over a Zenor Diode

No British bike ever came from the factory with a rectifier that wasn't solid state, but the modern ones are more reliable since they're encapsulated into a single lump rather than an assembled finned design. A zener is probably perfectly adequate except for long runs because the running voltage rem...