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lingeringstin... |
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lingeringstin... Trackday Trickster
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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WD Forte |
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WD Forte World Chat Champion
Joined: 17 Jun 2010 Karma :
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 01:11 - 25 Jan 2023 Post subject: |
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So do you have the sprocket that comes with each cam?
I suppose it would be a case of suck it and see. Might want to set the cam timing up using a degree wheel if you aren't sure you can trust the marks.
Are the cams the same profile/lift? Same base-circle diameter? ____________________ “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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lingeringstin... |
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lingeringstin... Trackday Trickster
Joined: 01 May 2014 Karma :
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Posted: 19:39 - 25 Jan 2023 Post subject: figured it out I think |
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As far as I could tell the lobes were exactly the same on both cams and I wouldn't be too bothered about a cam sprocket being half a tooth wrong in either direction because that's too little difference to matter really on an engine like this, but it turns out one of the cams has a slightly different sized central shouldered bit where the sprocket goes on, so only one of these cams would match up with the cam sprocket I had available.
I suspect that's down to a difference between a Honda cam and a 253FMM cam. I suspect one of these cams is a Honda one and I don't have a sprocket for that one.
I do know that if I use a Honda crank I have to use a Honda cam sprocket because Hondas used a duplex cam chain and the Chinky Benly clones use a simplex chain.
So anyway I've used the cam that I had a sprocket to fit and it all works fine now. I think I'll have to keep the other cam around for in case I ever have a Honda crank at some point and need to get a duplex cam chain sprocket, but to be honest the Chinky cranks and cams are perfectly fine and dead cheap to get brand new.
These Benly clones like the early Rebel 250's and these quadbike engines were never fire breathing monsters anyway. I use 125 heads on 250 quadbike barrels (bigger fins) with a single carb and an upgraded clutch and tweak my engines for a bit more compression by having the barrels milled off by a mil or two which effectively shortens the cam chain distance slightly so the cam sprocket is actually out by a wee tiny bit but it doesn't make any noticeable difference and I cobble a long bolt into the barrel as a manual cam chain adjuster and use needle roller bearings instead of those self destructing Honda style cam bearing shells.
I use YBR125 pistons because the bog standard pistons are a bit concave. It all just makes for a bit more poop to the pop.
Looks a bit weird but it works. Honda nerds will spot the differences.
https://i.postimg.cc/QMcX52FN/TURD.jpg
[url=https://postimages.org/][img]https://i.postimg.cc/QMcX52FN/TURD.jpg[/img][/url] |
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Old Thread Alert!
The last post was made 1 year, 83 days ago. Instead of replying here, would creating a new thread be more useful? |
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