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Post Info TOPIC: bike revving by itself after rebuild


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RE: bike revving by itself after rebuild
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I think it's a mint idea. I just don't think it is practical.

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The Leviathan Project



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I think I'll just postpone It


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Rebuilt the top end today and got it running, still revs way high on choke but I can get it to idle with minimal choke but still doesn't do want to idle off choke.

Turning out the mixture screw means I have to put more choke on to get it to idle

Turning it in means less choke, at the moment it's all the way in and it needs the smallest amount of choke to idle

Turning the throttle just makes it bog, although if I open it slightly it revs but then hangs

Definitely runs better than before but still have this problem just lesser



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Thats with a rebore and new piston?

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Yh, I've been having to clean out my carb every weekend so I'm cleaning the inside of the tank, there's quite a bit of rust and bits in there

From what I've been reading its possible the fuel is getting contaminated and causing it

Or its a blocked pilot circuit

I've bought an unlike fuel filter aswell

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so cleaned the tank and put another inlet manifold on and it runs better but the revs hang now

it was an air leak at the inlet manifold, I must have overtightened them too much and warped it. putting a flat piece of metal onb the surface and you can see its bowed

I torqued this second manifold up to spec and it ran fine for a while, but I'm still getting a slight air leak

it just doesn't want to sit flush

should I put some threebond on it

just to clarify it's between the manifolds and reed cage, where there's no gasket

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mr karnage wrote:

so cleaned the tank and put another inlet manifold on and it runs better but the revs hang now

it was an air leak at the inlet manifold, I must have overtightened them too much and warped it. putting a flat piece of metal onb the surface and you can see its bowed

I torqued this second manifold up to spec and it ran fine for a while, but I'm still getting a slight air leak

it just doesn't want to sit flush

should I put some threebond on it

just to clarify it's between the manifolds and reed cage, where there's no gasket


 Another 3-4 page thread where the answer was in the 2nd, 4th and then reiterated in the 6/7 posts.

I often use a silocone instant gasket on this to ensure a good seal. The mating surface of the reedblock has its own kind of "permanant gasket" which is a raised lip of rubber that will compress as tightened against the reedblocks mating surface.  If the reed block surface is warped then take it off and skim it as per Callums head skimming tutorial or buy a replacement reed block.

Once you have completely iradicated the possibility of an air leak, it is then time to set the carb again. This does suck if you've stripped it plenty of times before but atleast you'll be getting quicker at it.

Without meaning to rub salt into the wound, regarding the carb settings again...if you trusted the initial diagnosis we'd have been there alot sooner. It is so easy to over tighten those. I know I have stripped one on my 350 inlets but it doesnt appear to be leaking since using instant gasket so "if it aint broke" i aint fixing it.

Look forward to hearing a video of your bike running and revving nicely in the not too distant future!



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tell me about it

it's in fact the reed block that's warped, alot warped

the threebond only helped a little

I've got some pics I'll upload



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tumblr_n13ojc1mby1s5b0v1o1_1280.jpg

it's bent around the corners so im not going to able to get it skimmed as the other side will still be uneven a second hand one is probably the best route



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AndyYam wrote:
mr karnage wrote:

so cleaned the tank and put another inlet manifold on and it runs better but the revs hang now

it was an air leak at the inlet manifold,


 Another 3-4 page thread where the answer was in the 2nd, 4th and then reiterated in the 6/7 posts.



 yeah ..its becoming a trend now lol .

and +1 to silcone gasket type sealants  I also use them a lot even when not needed

 



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de restrictions

good clean up of a old batterd  dtr  95

 



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Yeah the reedblock is dead. I may have a spare to sell you if you want?

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reading up on it and alot of people use it on this type of manifold/reed design

I didn't expect it to be the actual reed cage itself haha

the tank definatley needed cleaning mind

filled or with vinegar and left it a week, it all just flaked off inside.

I'll take it off you mate

aren't you selling the 32mm manifold aswell?

if so then I'll take the reed block with it

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I've got a full belgarda engine that im selling. I dont wanna split the manifold from the engine though. You got a 32mm carb then?

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no but I'm planning on putting a 34mm delorto on

do you have a standard reed block then?

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