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Post by kevjoyce on Apr 13, 2020 11:46:19 GMT
Hey everybody, Haven't been around for a while, had a couple of bikes since the Superdreams and this is the current iteration. Was chatting to Terry the other day and he thought it may be of interest here... So this is my current bike. Its a CB350SG. Loosely based on the Superdream, and pretty damn fine. If I do say so myself... Mine isn't concourse, but it hasn't been messed around with. The only problem I have at the moment to deal with are exhaust studs...    Nice to see you're all rocking along... Kev |
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Post by Deleted on Apr 13, 2020 12:58:28 GMT
On advice from this forum I bought a Draper stud removal tool for removing the exhaust studs on my CB400NC. The studs had no thread left on them.
With a lot of heat and the stud remover they came out easily and intact. I had tried two nuts locked together and other methods without success previously.
The way the stud remover grips a large part of the stud is very efficient. I paid £11.50 for mine off eBay. One issue is that you have to buy a tool for the specific diameter of a stud so a set would be expensive. Some stud removers can be used for a range of stud sizes but they are bulky and not suited to the confined space around motorcycle exhaust studs.
Dennis
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Post by Deleted on Apr 13, 2020 13:54:38 GMT
I've got a black version of same cluttering up the garage  . |
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Post by kevjoyce on Apr 13, 2020 14:06:18 GMT
On advice from this forum I bought a Draper stud removal tool for removing the exhaust studs on my CB400NC. The studs had no thread left on them. With a lot of heat and the stud remover they came out easily and intact. I had tried two nuts locked together and other methods without success previously. The way the stud remover grips a large part of the stud is very efficient. I paid £11.50 for mine off eBay. One issue is that you have to buy a tool for the specific diameter of a stud so a set would be expensive. Some stud removers can be used for a range of stud sizes but they are bulky and not suited to the confined space around motorcycle exhaust studs. Dennis Hey Dennis, The problem is they've been seriously botched. Out of the 4, 1 has an original stud in (this I feel will be the easy one). Two have threads cut into the outside of the finny bit of the engine and larger diameter bolts holding the exhaust collar. One has nothing, as someone has previously tried to do the above thread cutting, but too close to the case and its mullered it. All stud holes (apart from the good one) have had some kind of metal weld epoxy put in and gummed up. Am going to ride it this summer (lockdown pending) and then deal with it when I bring it in for the winter. Thanks for the advice though. Kev |
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Post by kevjoyce on Apr 13, 2020 14:08:13 GMT
I've got a black version of same cluttering up the garage . Noice! Is it a good one? I heard the white ones are the fastest...  |
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Post by Deleted on Apr 13, 2020 14:37:54 GMT
I've got a black version of same cluttering up the garage . Noice! Is it a good one? I heard the white ones are the fastest... Good , would be over stating the case  . I replaced the cam chain and made the mistake of taking the top end off to do it .....barrels would not pull off snapped head bolts , horrible stainless sleeves jammed , replaced with new 400N bolts . Gaskets very hard to find , surprising how different they are to the SD . Most would be faster than mine !
It might run one day or it might be offered on Ebay as a boat anchor !
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terryc
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Post by terryc on Apr 13, 2020 18:48:52 GMT
Welcome back Kev still miss your bright yellow SD though |
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Post by ian on Apr 13, 2020 20:56:58 GMT
Hi Kev, nice to here from you again. I do like your bike, remember a lady on here had one a while back, first time I'd noticed them, you don't see them very often, so it would be great to follow your progress on here.
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Post by Deleted on Apr 15, 2020 13:43:40 GMT
Kev,
It looks like 'butchering' exhaust studs is a common problem. One of mine (the only one I did not remove and replace with stainless) has been re-done by drilling and tapping a hole alongside what I assume is a broken off stud. Somehow the new stud fits the clamp and still has some reasonable thread on it but it may be a job in waiting.
I wonder if someone with a lathe has thought about producing shouldered studs with a larger thread size at the head end, still conventional in diameter on the shaft and 6mm at the clamp end so that when an old thread in the head is drilled out the hole could be re-tapped at say 8 or 10mm?
I know that you could be lucky and just need to re-tap the head or use a heli-coil but without having the heads off and an engineering setup, drilling a broken stud out without butchering the hole in the head is a matter of luck.
Dennis
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Post by ian on Apr 15, 2020 19:30:53 GMT
There are shouldered thread studs available, this is one I saw on ebay www.ebay.co.uk/itm/M8-reducing-to-M6-Exhaust-Studs-x-50mm-Multi-Listing/322177619653?ssPageName=STRK%3AMEBIDX%3AIT&var=511085499155&_trksid=p2060353.m1438.l2649Also, it's worth considering using a small engineering company, it's surprising what they can do for not much money. One of the exhaust studs on my wife's RS sheared flush with the head when I was trying to remove it. My local engineers sorted it out with the engine still in one piece - mind you, the 250RS engine is a good bit lighter than a Superdream engine. I;ve also had them repair knackered thread with time serts, which are a much superior fix than helicoils. They did the spark plug threads on the CB125TD, which I've since removed & refitted half a million times trying to fix it's running problem |
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Post by kickstart on Apr 15, 2020 21:25:18 GMT
Hi Kev, one of my mates had one of those yonks back , he loved it and I had the odd blast on it and I thought it was great, keep us informed how you go on and enjoy
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Post by kevjoyce on Apr 16, 2020 5:52:37 GMT
Hey guys, It's great to be back. I know it's not an SD, definitely not the yellow one (god I miss that bike). The input is great though, honestly hadn't considered just taking the head off. Think I'll probably do that, if I can take it off without removing the engine. Seems like an easier approach. Although I've got to be honest, I did try and stop the exhaust off to have a proper look and it was proving difficult. Got scared, reassembled and took it for MOT, which it scraped through... That's why it's a winter job.... There's a couple of then bring broken on eBay at the moment, so may look for a head to replace it with I had to do a bit too get it on the road, one of the things was the rubbers were really stiff. I wished them in alcohol and winter green, and it worked an absolute treat. So supple now, thought it might be of interest as I know that was one of the problems I had with mine... Cheers. Kev |
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Post by Deleted on Apr 16, 2020 13:27:51 GMT
Hi Kev,
Yep the head comes off in the frame easily enough , quite a lot of room in there . The heads the best bit of my bike , the exhaust collars were corroded onto the studs and took a lot of work to get off , breaking one stud in the process. Much to my surprise that stud just wound straight out with no problems .
If you do decide to take the head off check the availability of the HG first , think CSMNL had a couple but I couldn't find anyone else who could supply them - the bore is bigger than a 250 and smaller than a 400  .
Put the exhaust back on mine and after putting the original solenoid back on it turns over so might try starting it later  |
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Post by buster on Apr 17, 2020 13:20:40 GMT
Hi Kev,
Yep the head comes off in the frame easily enough , quite a lot of room in there . The heads the best bit of my bike , the exhaust collars were corroded onto the studs and took a lot of work to get off , breaking one stud in the process. Much to my surprise that stud just wound straight out with no problems .
If you do decide to take the head off check the availability of the HG first , think CSMNL had a couple but I couldn't find anyone else who could supply them - the bore is bigger than a 250 and smaller than a 400 .
Put the exhaust back on mine and after putting the original solenoid back on it turns over so might try starting it later just a thought, could you overbore to 450? (only issue I can think of is would the cylinder sleeves go into the 350 crankcases?) lots of 450 parts easily available. |
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Post by Deleted on Apr 17, 2020 13:32:04 GMT
Good point Buster , 450s seem to have better parts support but TBH I don't have the love for it , more likely to put it on Ebay and hope someone takes it away !
I did put some fuel in and it started up yesterday but only on one and a carb started to overflow - just like a SD ! Lost interest rapidly at that point .  |
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. I replaced the cam chain and made the mistake of taking the top end off to do it .....barrels would not pull off snapped head bolts , horrible stainless sleeves jammed , replaced with new 400N bolts . Gaskets very hard to find , surprising how different they are to the SD . Most would be faster than mine !
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