jerks at low revs

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leevtr
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Re: jerks at low revs

Post by leevtr »

cybercarl wrote:No row's here mate but this is exactly why I didn't want to say anything and let people work it out for themselves. I suppose the fact that the TPS is set out of the factory for best emissions and not best performance tuning helps as well does it. Hence the reason that every TPS is set to a different reading. No two bikes will be exactly the same out the factory.

I think I will take factory pro's word for it after their years of performance tuning and extensive testing on an eddy current dyno. It also says to adjust to 500 Ohms in the Honda workshop manual. And like I say it worked for me. Yes there are some people out there that say it doesn't do anything for them and yes there are some people that say it has improved things. Some with standard engines and some with highly modified. But it is simple to put back to as it was previously if one makes a note of what it is set at to begin with so worth a try. Along with proper tuning it helps.

Tuning alone did not solve it for me but helped, so I then adjusted the TPS which did. This proved to me that the TPS does indeed have an effect. I made no other changes between tuning and adjusting the TPS.

Anyway I didn't think you would be seen crawling along in heavy traffic. :lol:

(:-})
No not out of choice, sports bikes are for the open road. I have commuted on storms from time to time, especially in winter when I feel it needs a run and the weathers ok i'll go to work on it.

I'll happily eat humble pie if it made my bike feel better, but i've not personally found low speed any more of an issue on vtr's than any other bike. What I cant grasp is why Honda would set it at one thing then advise something else in the workshop manual. Maybe if your'e bored one day you can adjust mine and I'll to the taste test, as long as its not a right palava !!
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VTRDark
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Re: jerks at low revs

Post by VTRDark »

Careful that could be considered a modification. :lol: Yeh we can set yours one day if you like.
What I cant grasp is why Honda would set it at one thing then advise something else in the workshop manual.
It's under TPS replacement at the top of page 17-10 and they say to set between 490 and 510. At the factory they need to pass the emissions tests before releasing for sale. I guess the workshop manual is not so concerned about emissions tests but servicing, repairing and putting things right. :Shrug:

(:-})
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leevtr
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Re: jerks at low revs

Post by leevtr »

cybercarl wrote:Careful that could be considered a modification. :lol: Yeh we can set yours one day if you like.
What I cant grasp is why Honda would set it at one thing then advise something else in the workshop manual.
It's under TPS replacement at the top of page 17-10 and they say to set between 490 and 510. At the factory they need to pass the emissions tests before releasing for sale. I guess the workshop manual is not so concerned about emissions tests but servicing, repairing and putting things right. :Shrug:

(:-})
Actually I just read the write up on it and dont think I'll bother you with it. Bikes ok as far as I'm concerned, maybe if I dynojet it and the carbs are off anyway. Cheers anyway.
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AMCQ46
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Re: jerks at low revs

Post by AMCQ46 »

Remember the main symptom of this post is that it got bad when the engine got very hot, it is not a problem at normal temperature
AMcQ
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leevtr
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Re: jerks at low revs

Post by leevtr »

AMCQ46 wrote:Remember the main symptom of this post is that it got bad when the engine got very hot, it is not a problem at normal temperature
Yep, back on topic. Has anyone else thought of ' grabby clutch ' ??
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8541Hawk
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Re: jerks at low revs

Post by 8541Hawk »

cybercarl wrote:It's under TPS replacement at the top of page 17-10 and they say to set between 490 and 510. At the factory they need to pass the emissions tests before releasing for sale. I guess the workshop manual is not so concerned about emissions tests but servicing, repairing and putting things right. :Shrug:

(:-})
I agree with you on why the TPS is set high from the factory. It is am "Emissions" setting.
That is why our (US) bikes have shear bolts holding the TPS in the "factory" position.

The manual setting is what the engineers\designers found to be the best running position.

I do have mine set to 430 OHMS right now as that was once touted as the actual best place to run it at, though I really haven't noticed much if any difference from the 500 OHM setting.
Though the lower TPS setting did smooth out the bottom end on my bike. As she sits right now, I can pull cleanly from 2K RPM in any gear with no issues. :thumbup:

I have also heard that some bikes don't like the 500 OHM setting and have run better with the higher factory setting.
Though it is second hand knowledge, so I really don't know for sure but as every bike is different it is possible that once in a while you will find one that likes the higher setting.

Which leaves that IMHO it is worth trying. Write down the factory setting and then set it to 500OMHs and see if the bike runs better..... it is quick and easy to do.
If you don't like it, it is just as quick and easy to put it back and on the bikes I have done this to, it has made a positive difference.
Loud pipes don't save lives, knowing how to ride your bike will save your life.
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8541Hawk
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Re: jerks at low revs

Post by 8541Hawk »

leevtr wrote:Yep, back on topic. Has anyone else thought of ' grabby clutch ' ??
Another thing to look at as it happens when the bike is hot it could also be an oil issue.

In my experience, these bikes can be a little picky when it comes to what oil you run.
It is not and engine issue but the wet clutch can act up with some oils.

Really not trying to start an oil thread but can I ask what oil you are running in the bike?
Also I agree with checking the cush drives and inspect the chain for tight spots as these both can make the bike rough riding down low.

Now the "grabby" clutch.... there is not a whole lot to be done there.
Though with as many torques as we have there is never really any need to "slip" the clutch....
Just let it out and give a little throttle, no worries even with a lightened flywheel, she won't stall :wink:
Loud pipes don't save lives, knowing how to ride your bike will save your life.
jzape2005
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Re: jerks at low revs

Post by jzape2005 »

:D :D :D
Last edited by jzape2005 on Thu Oct 10, 2013 3:51 pm, edited 1 time in total.
jzape2005
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Re: jerks at low revs

Post by jzape2005 »

Hello everyone and thank you for your answers.
buf .... amazing information given by all of you, of excellent quality.
I start by thoroughly clean carburetors and all the accessories, I think with almost 47,000 miles, and you should touch a clean, not if I put in the previous question, but this bike was standing over a year, in a garage discovered, with the Mediterranean sun in all its splendor, but the bike was covered with a good canvas, I think took effect and not surprise me that the remains of gasoline will stay stuck in the troughs of carburetors, and clog the suppliers step ......
this weekend could not be, my wife sent me job ..... in order in the evenings and at times we will.

Greetings from Catalunya, by the way 24 degree weather at 14.00, 12 degrees at 6 am, when I go to work with my VTR, I enjoy every morning that I drive .... dodging radars ....
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VTRDark
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Re: jerks at low revs

Post by VTRDark »

Greetings from Catalunya, by the way 24 degree weather at 14.00, 12 degrees at 6 am,
Now that's just cruel telling us that :Stick1:

Well if the bike has been sitting around then the carbs will be gummed up from old fuel for sure, especially with the heat over there. Get them off, strip them down and clean.

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jzape2005
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Re: jerks at low revs

Post by jzape2005 »

Hello all again. Thanks for all your information , it really IS SPECTACULAR .
I've been reading the VTR maintenance , before touching anything I want to have a clear idea of ​​what I have to play, I read that this model has a throttle position sensor , sorry if I do not write correctly , as the book is also in English , and of course I have no advantage ....
I noticed some bikes , I started with a Laverda 750 sf , to restore almost entirely , after one BMW , and with injection , and now I'm busy with a year 1100 Suzuki gs 80 , I want to turn into a cafe racer ..... .
Vtr But I was surprised by the level that leads , I did not expect that being a motorcycle carburetion , take much technology is an issue that I really like . to the point ... this sensor for the hell serves puzzles me , I hope to start dismantling this week if all goes well , if it seems good I'll put pictures of the process , although I'm sure some of you already have done. and I hope to answer your pardon if I did not work well the translator of google , , , , , greetings from CATALAN , I hope you visit soon , two-stroke accelerator and you are you here , Jordi .
One of my trips is to go to Donnington, if the crisis did not drown, or the politicians ,
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VTRDark
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Re: jerks at low revs

Post by VTRDark »

this sensor for the hell serves puzzles me
Did you see this thread as it may give you an insight to it's purpose and how it works.

http://www.vtr1000.org/phpBB3/viewtopic ... 31&t=29429

It's good to hear you have been reading up and learning about the VTR engine. :clap: :clap: There's nothing more satisfying than getting to know your engine and doing your own maintenance. It saves a fortune in garage bills and you know it's done correctly.

(:-})
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