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Post by Yogi on Dec 20, 2015 19:06:40 GMT 1
Well jealous of that cave, fair play to ya there Mark Your 550 build is way beyond anything my little brain could handle Can wait to see the problems/answers this build produces Good Luck Matt
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Post by yamark on Dec 20, 2015 19:47:03 GMT 1
Well jealous of that cave, fair play to ya there Mark Your 550 build is way beyond anything my little brain could handle Can wait to see the problems/answers this build produces Good Luck Matt Thanks Matt - It is a lot more pleasant than my concrete bunker of a workshop.
I don't believe for a second that you couldn't build a multi cylinder two stroke. You just have to dig a bit deeper to find answers. Or, know people that have built similar engines. I'm getting more confident of the build as the parts pile grows. I must have about 85% of the bike now.
Cheers Mark
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Post by twostrokebrit on Dec 21, 2015 18:34:24 GMT 1
it may have been asked before but are you going to brace the LC frame to handle the extra weight/power?. T I A Mark
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Post by yamark on Dec 21, 2015 18:53:44 GMT 1
I thought I'd show you the petrol tank off the NOS build from last year. To refresh your memories the tank had been lined by the previous owner, repainted but started to blister. That is when I bought the bike. Now the tank didn't look that bad, but I got a really clean replacement as I didn't want to take any chances. So I had the tank kicking around (thinking I might use it on the 550) and tried to get the old liner out with a bit of success, using acetone. This loosened the liner (which looked like resin) but then it was near impossible to get the large chunks out of the tank.
First I had the tank blasted
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I thought it was OK until I looked closer
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By now I could hear all the crap and rust inside, so out with the diamond disc
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I could not believe the state of the tank and old liner!
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And my favourite image - liner, bottle tops and rust
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You can see why so many liners fail. I'll post up progress of the repairs
Mark
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Post by steeley on Dec 21, 2015 19:24:50 GMT 1
interesting photos . I am in the process of repairing a tzr250 tank. I had the same sort of scene about 20yrs ago with my own lc 350 ,tank leaking so strip the paint off and find plenty of holes.so cut the underside out and oh dear. in the end I lucked on a couple of solid tanks but they both needed work dent wise because they both had enough filler to qualify for a share price on the stock exchange. lol.
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Post by yamark on Dec 30, 2015 10:47:32 GMT 1
it may have been asked before but are you going to brace the LC frame to handle the extra weight/power?. T I A Mark Good question. The short answer is yes. The plan is to spread the frame to improve the chain clearance so the area around the swingarm will have extra bracing. The overall weight will only increase slightly. Extra 2 crank flywheels, cylinder, head, exhaust and a bigger cooling system. Offset by lighter RGV front and back end.
Mark
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Post by yazza54 on Dec 30, 2015 13:19:30 GMT 1
Realistically what kind of power are you expecting? Around 75-80?
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Post by yamark on Dec 30, 2015 17:24:31 GMT 1
Your spot on Yazza. Cylinders have a mild tune, so I think 70/75 HP is my top goal. I hoping for good mid range and a smooth engine with a 120 degree firing order. I haven't really thought of exhausts or carbs yet.
Mark
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Post by yazza54 on Dec 30, 2015 17:27:29 GMT 1
TSA pipes and 34mm carbs if it were me
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Post by chris356 on Dec 30, 2015 22:50:34 GMT 1
Bet it will sound unique bit like this v48
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Post by paulsx on Jan 5, 2016 10:03:41 GMT 1
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Post by yamark on Jan 5, 2016 18:14:02 GMT 1
Paul, you are a star. Brilliant article I'm going down the same route as Harry for my ignition, Dyna S coils. 3 of them. Same as the article on the TZ, I have to extend the left engine cover with a RD400E cover. Should be fun!
Thanks for posting Paul
Regards Mark
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Post by zedixe13 on Jan 6, 2016 7:28:57 GMT 1
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Post by paulsx on Jan 6, 2016 15:17:13 GMT 1
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Post by yamark on Jan 6, 2016 22:17:14 GMT 1
OMG, even better - cheers again Paul for posting and thanks for the encouragement
Zedixe13 - great images. Thanks. As you say a true master. Both bikes are a bit nuts. I think you have to be a bit warped to take on these sorts of builds and I'm sure I fit in to that category
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Post by leaky on Jan 9, 2016 11:35:35 GMT 1
Great write up so far Mark.. loving the shed - especially the skirting detail! I've met Harry at a few LC club Lakes rides and he's quite the character. Carry on fella, subscribed!
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Post by yamark on Jan 10, 2016 20:15:25 GMT 1
Cheers Leaky, nice comments. I've never had the pleasure of meeting Harry, but have spent a lot of time on the phone finalising crankcase details as the options seem endless. Itching to get my hands on the crankcases.
Progress on the tank. I cleaned up the inside of the tank and rotary wire brushed the rusty bits
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Got my mate Dean to weld the thank back up.
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Next stage is to silver solder the vast number of holes in the tank. Tapered pins fitted
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Silver soldered
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I think the tank is too far gone to use on this build
Mark
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Post by Yogi on Jan 11, 2016 17:32:00 GMT 1
Good luck with the s/solder Mark Took me 4 tries to do mine before it stopped leaking My mate brought his round with more holes than mine and I did it first time So mixed results
Silly question but why didn't you try it while it was apart?
Cheers Matt
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Post by yamark on Jan 11, 2016 22:38:49 GMT 1
Good luck with the s/solder Mark Took me 4 tries to do mine before it stopped leaking My mate brought his round with more holes than mine and I did it first time So mixed results Silly question but why didn't you try it while it was apart? Cheers Matt Hi Matt, the tank is pretty knackered, I think there's about 60 odd pin holes in it! I've repaired tanks before with silver solder, I drill the pin holes out to get to solid metal, make a tapered pin out of steel to plug the hole, then solder. I'll post up photo's later. To answer your question (not silly), I was worried about the temperature of the welding affecting the silver solder. The plan has always been line the tank with POR15 but I cut the bottom of the tank out to properly de-rust and remove all of the old liner. This is more of an experiment to see if I can get the tank leak free. I'll see how it turns out.
I've got another tank to blast and de-rust that I will probably use for the build. If that ones knackered then I'll have to source another tank.
Cheers Mark
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Post by yamark on Mar 22, 2016 7:28:19 GMT 1
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Post by dusty350 on Mar 22, 2016 7:36:53 GMT 1
Hi mate So pleased you have got it moving now. It will have been worth the wait !! Looking forward to more pics.
Dusty
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Post by budgie on Mar 22, 2016 8:05:22 GMT 1
Nice to see your moving forwards with this one, will be watching with interest....keep the pictures coming..!!
Gav
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Post by Slabsideian on Mar 22, 2016 22:07:13 GMT 1
Good news to see it progressing mate. Good luck with it.
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Post by yamark on Mar 23, 2016 8:26:54 GMT 1
Cheers lads, feels like I've taken a big dose of Senokot and the blockage has cleared!
I hope the build will move at a fair pace now; lots going on
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Post by markhoopy on Mar 23, 2016 10:49:33 GMT 1
I've been wondering for a while how you go about lining up the cases accurately. Seems obvious now you've posted this pic
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Post by Deleted on Mar 23, 2016 16:35:40 GMT 1
Line bore after, just to make sure?
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Post by KevtheRev on Mar 23, 2016 16:53:27 GMT 1
Oh you crazy b'stard ! Fair fvcks to you . Best of luck !
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Post by twostrokebrit on Mar 23, 2016 18:00:16 GMT 1
Line bore after, just to make sure? IF you line bore the cases it would need either bigger bearings or sleeves welded in place then rebored to original sizes.
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Post by yamark on Mar 23, 2016 19:36:11 GMT 1
Keep the questions coming, I'm glad to answer them. Thanks Mark (hoopy), two bars are placed and clamped in place for final welding. Allen Millyard uses this method, as it stops the cases warping and aligns all the bearing surfaces up. The bars are the exact diameter of the bearings.
hblair, thanks for your interest, but there is no need to line bore.
Twostrokebrit, you are quite right, if you line bore, you'd need either bigger bearings or sleeves,
Kevtherev, You're a man after my own heart. Love the comment
Thanks for all the interest chaps
Mark
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Post by Deleted on Mar 24, 2016 2:38:19 GMT 1
Ahh problem solved, neat trick
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