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doggone |
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doggone World Chat Champion
Joined: 20 May 2004 Karma :
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Posted: 00:19 - 14 Feb 2020 Post subject: Montesa 315R - starting issues |
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Friend has bought a reasonable looking one of these but it has stood unused since about 2017 and won't start on the kicker so far despite having good spark and fuel.
In desperation we towed it behind a quad bike and after several minutes it suddenly roared into life at full throttle resulting in a minor crash but only minor damage.
Still not been able to start it on kicker but at least we know it can run!
Any insight about what's wrong?
Typically for him he's already splashed out on new tyres (surprisingly expensive) as old ones were perished, and is wanting to get new front and rear mudguards/seat they are a bit battered.
But it won't start yet... |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 00:44 - 14 Feb 2020 Post subject: |
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Has a slide carb yeah?
If it went full throttle on a slide carb without you holding it at full throttle, that means the throttle valve is being held open. Throttle valve stuck (or idle screw screwed all the way in), cable stuck/poorly routed or the needle sticking in the emulsion tube or (if it was owned by an idiot, and I have seen this done before) throttle valve in backwards.
Or a dead rat in the carb venturi?
I've seen cables pop the ferrules up out of the seat at one end or the other so they are resting on top instead of seating in. Especially if they get sticky. This has the effect of holding the throttle halfway open.
You should be able to hear the throttle valve hitting the idle stop when you snap .the throttle closed. ____________________ “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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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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doggone |
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doggone World Chat Champion
Joined: 20 May 2004 Karma :
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steve the grease |
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steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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doggone |
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doggone World Chat Champion
Joined: 20 May 2004 Karma :
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doggone |
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doggone World Chat Champion
Joined: 20 May 2004 Karma :
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Old Thread Alert!
There is a gap of 1 year, 66 days between these two posts... |
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doggone |
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doggone World Chat Champion
Joined: 20 May 2004 Karma :
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Suntan Sid |
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Suntan Sid World Chat Champion
Joined: 07 May 2009 Karma :
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Posted: 00:01 - 02 May 2021 Post subject: |
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Serious air leak into the crank cases.
Or, less likely, air leak on the fuel inlet. ____________________ "Everybody needs money, that's why they call it money!" |
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thx1138 |
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thx1138 World Chat Champion
Joined: 06 Oct 2005 Karma :
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doggone |
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doggone World Chat Champion
Joined: 20 May 2004 Karma :
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Posted: 18:18 - 02 May 2021 Post subject: |
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We had a quick look at it again this morning and though at first it couldn't be turned on kickstart it was possible to free it by getting it in a higher gear and turning the wheel backwards at first - it doesn't look good but probably still well worth repairing when he has spent so much on it already.
He had just put the tank back on it wouldn't be surprising if the throttle cable wasn't routed correctly because when it was run previously on blocks it was just sat in place loose (it's fiddly to secure).
Otherwise some kind of air leak must be first thing to suspect.
What troubles me is the plan was to get this in usable condition for his lad to use, he is only 12 but unusually big and strong for his age, but has only ridden mountain bikes before - he's very accomplished on that even on really tricky going.
It seems kind of temperamental and if every time he tries to ride it something breaks down it might put him off for life |
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Old Thread Alert!
The last post was made 3 years, 39 days ago. Instead of replying here, would creating a new thread be more useful? |
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