Another MT350 restoration complete. Well almost......

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appyarry
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Re: Another MT350 restoration complete. Well almost......

Post by appyarry » Tue Feb 12, 2019 2:07 pm

when I fit the locking bolt in position I only tighten it by hand. This is enough to do a full dismantle and re-build and it won't destroy the thread in the cranckcase as can happen if it is overtightened.
2 x
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Minter
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Re: Another MT350 restoration complete. Well almost......

Post by Minter » Tue Feb 12, 2019 10:41 pm

Over 50% of the motors I get to work on have got a damaged or stripped thread!

I use Timeserts - expensive but will last a long long time!
0 x
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Wirralman
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Re: Another MT350 restoration complete. Well almost......

Post by Wirralman » Tue Feb 12, 2019 10:52 pm

Minter wrote:
Tue Feb 12, 2019 10:41 pm
Over 50% of the motors I get to work on have got a damaged or stripped thread!

I use Timeserts - expensive but will last a long long time!
50% damaged ! I'm amazed it that high. Evidence of more brawn than brain !
0 x

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Minter
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Re: Another MT350 restoration complete. Well almost......

Post by Minter » Wed Feb 13, 2019 7:50 am

Wirralman wrote:
Tue Feb 12, 2019 10:52 pm
Minter wrote:
Tue Feb 12, 2019 10:41 pm
Over 50% of the motors I get to work on have got a damaged or stripped thread!

I use Timeserts - expensive but will last a long long time!
50% damaged ! I'm amazed it that high. Evidence of more brawn than brain !
I've seen bolts glued in, miles of Ptfe tape wrapped around the bolt, chemical metal, helicoils touching the crank (where did the tang go!)
0 x
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Manuals & Technical Publications on above MTRC shop link

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Derrick
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Re: Another MT350 restoration complete. Well almost......

Post by Derrick » Fri Feb 15, 2019 1:00 pm

Minter wrote:
Wed Feb 13, 2019 7:50 am
Wirralman wrote:
Tue Feb 12, 2019 10:52 pm
Minter wrote:
Tue Feb 12, 2019 10:41 pm
Over 50% of the motors I get to work on have got a damaged or stripped thread!

I use Timeserts - expensive but will last a long long time!
50% damaged ! I'm amazed it that high. Evidence of more brawn than brain !
I've seen bolts glued in, miles of Ptfe tape wrapped around the bolt, chemical metal, helicoils touching the crank (where did the tang go!)
I think many of these threads have been damaged in the early days of private ownership, not by over-tightening but when trying to hold the crankshaft to undo the crankshaft nut for the first time in 15 years. I now use an electric impact gun, but before getting that it was a case of put in the locking bolt and stand on the rear brake pedal while in gear using a socket and long bar to undo the nut. This does not strip the threads but can elongate the hole so the bolt becomes a loose fit. As clutches and sprag springs were early problems, it was about one of the first things to be done when they were first bought from Withams.
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lardmarc
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Re: Another MT350 restoration complete. Well almost......

Post by lardmarc » Sat Feb 16, 2019 5:13 am

Minter wrote:
Wed Feb 13, 2019 7:50 am
Where did the tang go?
I'm sure their's a KTM joke in there somewhere.
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mt bandit
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Re: Another MT350 restoration complete. Well almost......

Post by mt bandit » Sat Feb 16, 2019 10:50 am

lardmarc wrote:
Sat Feb 16, 2019 5:13 am
Minter wrote:
Wed Feb 13, 2019 7:50 am
Where did the tang go?
I'm sure their's a KTM joke in there somewhere.
i thought it was a song
0 x
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martin shaw
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Re: Another MT350 restoration complete. Well almost......

Post by martin shaw » Sun Feb 17, 2019 3:39 pm

Todays update.....

I changed the clutch friction plates this weekend and put everything on the timing front (described above) back to book. I filled it with oil and petrol and pressed the starter. It would turn but sounded like the sprag clutch was disengaging too early. However, I kept going and trying and even tried the kick start but to no avail. Checked there was fuel and a spark and there was. Decided to put the timing back to how I found it when removing to service the clutch. After a bit of perseverance, it fired up and ran. A few adjustments to the throttle and clutch cables and it was rideable. I did about 5 miles and switched off. I thought I would try the starter to see if it would go now it had been running but got nothing, no neutral light, nothing. Then found the starter cable earthing to the frame so quickly disconnected the battery.

So first job, reroute the battery and see if the starter and kick work. If they do, happy days. If not, looks like the casing is coming off again to investigate the sprag clutch.
1 x

Wirralman
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Re: Another MT350 restoration complete. Well almost......

Post by Wirralman » Sun Feb 17, 2019 4:48 pm

Good to hear you've got the engine running There is something non-standard there judging by the set up

If everything is set up ok, kick starting a 350 can be a lottery. I have had an engine fire up with a mere stroke of the kick start but on the next day flatly refuse to fire up, only doing so with a press on the magic button

I'd be tempted to drop down to Sportax and see if the mystery can be solved, he's only 70 miles from you

As for the sprag , if you're lucky it will just need a new spring to keep the lobes tight. If not, and the lobes are worn excessively, a replacement might be needed
1 x

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Minter
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Re: Another MT350 restoration complete. Well almost......

Post by Minter » Sun Feb 17, 2019 11:15 pm

If you're still having problems Martin pop over and see us.. We repair these engines and bikes everyday of the week..
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