Planet Minis

Yawnson

im having some trouble with my tb kit that i just bought. its an 88 cc racehead kit. i installed it and it seems to bog when i hit the throttle hard. could this be because when i installed it i didnt put the black intake spacer in. im not sure if it goes in the top or bottom of the intake. here is a pic without it in.

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50 Pics 004.jpg (1.37 MB, 58 views)

BIKEsatori

sounds more like a jetting problem... but, that black "heat shield" spacer goes under the intake over the head. Put it on.

project-c2

Check your cam timing 1st. 1 tooth makes a big difference. If that's all good, then to the carb.

MoTo_XXX

could very possible be jets,the ccarby needs rejetting after the new gear,it is probly not getting enough fuel for the 88kit and thas why it is bogging and also the timing is very inportant

Fatdbag

Good luck, I've had mine put together for a couple of months and I'm about ready to throw it off of a cliff.

EddieNewYork

I have an tb88cc w/racehead that does the same thing. I haven't tried working on it yet. How does one check the cam timing? Is that done by finding TDC and a feeler gauge?

moto234

re jet it

ROBINSONDB22

is it the heatsheild spacer or the black spacer that goes between the carb and the manifold that has the gasket on one side and oring on the other. either way if you put this kit on and didn't re jet it that is your issue and not having that spacer in will upset your jetting as well. make sure you have a good seal between the carb and intake and the intake and head or else you'll never get it right

mxsam34

i had the same problem with the top end bogging.......the choke was half on

50rider340

timing being off, it will sound like a slowed down rev limiter. Hold it wide open not in gear, if it does that then its the timeing.

Its most likely jetting. The carbs that they come with are practically impossible to get the bog out, its been done but there very touchy. If you can get your hands on a 19 mm nock off xr70 carb, your jetting issues will be over. 38 piolet and a 82 main and you will be mint.

Yawnson

a mechanic freind of mine says that i need a new piloet jet. what size piloet jet do i need? i checked the trail bikes website and all i could find was the 26mm piloet jet. is this the right size?

BIKEsatori

no, sounds like what you were looking at is for a 26mm carb (that probably comes with their 117cc kits, etc). The TB 88 racehead kits come with a 20mm shengway carb. You'll need jets for that specific carb, but from that point you'll need to determine what size pilot jet you'll need for the 20mm shengway carb... like, 35 or 38 or 42 or whatever... just some example sizes of pilot (slow) jets. And, that size is dependant on your set-up/mods, your elevation, humidity, and climate, etc. It's 90% all trial and error, that is unless you can find somebody in your area with the same set-up and use their numbers as a baseline to go on.

project-c2

They have the pilot jet kit and the main jet kit for the 20mm aft carb and the keihin carb. I ended up with a 38 pilot, a/s 1.25 turns out, clip 4th position and 95 main. Bog is gone off idle, but a little lean, but nothing the a/s can't fix. I also raised the float level 1mm.

Honda Trail Bikes

Honda Trail Bikes

Here's the links to the jets you need.

Yawnson

Thanks C2 just ordered those jets. i was wondering, should i invest in the tb oil pump kit? that prevents overheating right? i was just wondering if it is worh buying? Or if you need it.

minirdr

you mean oil cooler? if so, an oil cooler is not needed. an hd oil pump on the other hand, YES.

oilspot

I've been running the tb88rh kit for a while. I rejetted but still have a little bit of bog, nowhere near as bad as it was.

read through this... it may help
function of pilot jet

when I posted this i was dealing with the "bog" your having problems. And yes the pilot was the main culprit.

Yawnson

What does the HD oil pump do that makes it so important to buy?

joman2055

it flows more oil to the top end.

Fatal Cheyne

timing.. i had the same problem